10% Overdrive Crank Pulley

[Magnum Powers]

I am considering manufacturing a 10% overdrive crank pulley for the Super Coupe and would like to know if there is interest in it. As you all know the small 10% blower pulleys tends to slip because the surface area is reduced when the pulley diameter is reduced. If the crank pulley is instead made larger in diameter by 10% you will realize more blower overdrive without any of the pulleys being made smaller and thus reduce the tendency to slip.

Let me know if you like the idea.

Charles
Magnum Powers, LLC

[Nettlesd]

That would make for an awesome new product. You might even think about making a 5% overdrive crank pulley for people who just want 5% or for those people who already have something on their car but want to step up to 10%.

Oh, how about a bigger blower. :)

[BT Motorsports]

I cannot see the advantage of a larger crank pulley since it will increase weight and at the worse point in the system, the outer diameter of the pulley which sees the highest stress. With the troubles some have had with keeping a crank in the SC, that is one point I would look to reduce weight at, not increase it.

The 10% jackshaft pulley has already been proven to increase blower speed while reducing weight without belt slip.

Paul

[Magnum Powers]

I cannot see the advantage of a larger crank pulley since it will increase weight and at the worse point in the system, the outer diameter of the pulley which sees the highest stress. With the troubles some have had with keeping a crank in the SC, that is one point I would look to reduce weight at, not increase it.

The 10% jackshaft pulley has already been proven to increase blower speed while reducing weight without belt slip.

Paul
Hi Paul,
The stock Ford pulley is made of steel and weighs 6.2lbs. The pulley I've designed is made of aluminum and weighs 2.2lbs.

[Kevin Leitem]

I cannot see the advantage of a larger crank pulley since it will increase weight and at the worse point in the system, the outer diameter of the pulley which sees the highest stress. With the troubles some have had with keeping a crank in the SC, that is one point I would look to reduce weight at, not increase it.

The 10% jackshaft pulley has already been proven to increase blower speed while reducing weight without belt slip.

Paul
people that are snapping cranks is due to an improper tune, advancing the timing too much just to try to find more horsepower without getting greasy. I personally think a 10% crank would de ideal. the couple more ounces is not going to make a bit of difference!

[supercatxr7]

Sounds like a great idea. I would like to see it produced.

[BT Motorsports]

Hi Paul,
The stock Ford pulley is made of steel and weighs 6.2lbs. The pulley I've designed is made of aluminum and weighs 2.2lbs.
Well, if it is truly 2.2lbs, yet larger than the stock crank pulley, that is certainly impressive and I would like to see it. From the measurements George Davenport has taken, the stock crank pulley weighs 7.03125lbs and the aluminum underdrive ASP crank pulley which is smaller than stock weighs 2.84375lbs. How did you get a larger pulley than stock to weigh around 1/2lb less than the smaller ASP underdrive pulley and still maintain enough strength?

people that are snapping cranks is due to an improper tune, advancing the timing too much just to try to find more horsepower without getting greasy.
Kevin, I personally recall off the top of my head two people (know both of them personally in fact) who had issues with breaking crankshafts on more than one occasion in reference to my comment. One of them was running a relatively stock vehicle with no timing changes and the other had a dyno tune by Brian Herron. In both of these instances, timing advance was not an issue.
the couple more ounces is not going to make a bit of difference!
I would agree if the few ounces were added at or very near the center of the pulley, however, weight added at the outer portion of the pulley is very significant to changes in stress on the crank. Granted, an aluminum pulley of less weight than stock will reduce the stress the crank sees, however, that information was not provided prior to my response. I still ask though, why produce such a part when the same goal has already been accomplished with the jack pulley..... "why try to reinvent the pulley"?

Charles, if anything, it would seem the biggest benefit would be to produce the lightest crank pulley possible to work with a 10% jack pulley. This would combine the greastest amount of weight savings while still allowing 10% overdrive for those who want it.

[Kevin Leitem]

Kevin, I personally recall off the top of my head two people (know both of them personally in fact) who had issues with breaking crankshafts on more than one occasion in reference to my comment. One of them was running a relatively stock vehicle with no timing changes and the other had a dyno tune by Brian Herron. In both of these instances, timing advance was not an issue

was the balancer correct? weight sould not be an issue if it is balance properly!! When i got my 5% jackshaft i was dissapointed that the side of the pully for the crank was made smaller and the supercharger side was left alone. i hoped the supercharger side would be bigger. And please don't tell me that would add weight! I don't want to make it sound like i know everything, but most people try too hard to make these engines run better. all it take is work at the places where it counts

[Nettlesd]

I think Charles is headed in the right direction. One of the most effective ways of increasing the boost in a Cobra, Lightning or Harley Truck is by a larger aluminum crank pulley. So, I can see where Charles is headed since it's already being done with the above mentioned car and trucks. They don't seem to have any problem with the larger and lighter crank pulley. Ha, maybe it's one of those companies that will be making them for Charles. :)

Charles, I think you have a winner on your hands, especially, if you produce a 5% crank pulley for those people who already have a 5% supercharger pulley or one of the new 5% SCP jackshaft pulleys. I would make a 5% and 10% and capture all of the market. Heck, I would start now and setup a group buy within the group buy forum.

Last, but not least, a lot of people will buy from you because you have a trusted name within our community and you support our cars and events.

[007_SuperCoupe]

I like the idea of it. Some people will mod their cars in stages and this will fit in well with some of those types of approaches. Take my example for instance:

I have a 5% pulley installed
Lightweight jackshaft pulley installed

I'd rather keep the parts I've already spent my hard earned money on and overdrive the supercharger via the crank pulley. I don't have the exhaust (today) to go faster with the supercharger, so that's why I went only with the 5%. This just will give another option to those of us whose budgets are a bit tighter than others. I like the idea and would very much like the option when I am ready to address the pulleys on my SC.

[Magnum Powers]

I think Charles is headed in the right direction. One of the most effective ways of increasing the boost in a Cobra, Lightning or Harley Truck is by a larger aluminum crank pulley. So, I can see where Charles is headed since it's already being done with the above mentioned car and trucks. They don't seem to have any problem with the larger and lighter crank pulley. Ha, maybe it's one of those companies that will be making them for Charles. :)

Charles, I think you have a winner on your hands, especially, if you produce a 5% crank pulley for those people who already have a 5% supercharger pulley or one of the new 5% SCP jackshaft pulleys. I would make a 5% and 10% and capture all of the market. Heck, I would start now and setup a group buy within the group buy forum.

Last, but not least, a lot of people will buy from you because you have a trusted name within our community and you support our cars and events.

OK, it sounds like there is some interest out there for this product. I have both a 5% and a 10% pulley design that I will send out for quotes. These pulleys must be surfaced treated for good wear qualities and long life. They can be black, some other color (red, blue, etc) or clear. What color would you like to see? Since quanities are limited we need to decide on one. I think Black or Clear. What say you? Oh, yea I could make matching jackshaft and blower pulleys as well if there is interest in them.
Charles

[Nettlesd]

OK, it sounds like there is some interest out there for this product. I have both a 5% and a 10% pulley design that I will send out for quotes. These pulleys must be surfaced treated for good wear qualities and long life. They can be black, some other color (red, blue, etc) or clear. What color would you like to see? Since quanities are limited we need to decide on one. I think Black or Clear. What say you? Oh, yea I could make matching jackshaft and blower pulleys as well if there is interest in them.
Charles

Charles,

I'm not sure how far along you are in the design, but, I would look into making them a 2-piece design, where as, someone could swap between the 5% and 10% portion of the pulley. This way, people could have the best of both worlds. I believe you probably follow what I'm trying to say so I won't elaborate on the actual design.

Also, as you can see, 007_SuperCoupe is the market segment I'm talking about in my previous post.

[Ryan A Harris]

What kind of Aluminum will be used? What kind of testing will used to make sure the pulley doesn't fail after it goes out to the public?

I think this is good idea. Giving more options for the SC's owners to OD the blower. I'm not going to doubt it, or bad mouth it, I'd like to see it before I'd pass my judgement on it.

Keep up the good work.

[BT Motorsports]

What kind of Aluminum will be used? What kind of testing will used to make sure the pulley doesn't fail after it goes out to the public?

I think this is good idea. Giving more options for the SC's owners to OD the blower. I'm not going to doubt it, or bad mouth it, I'd like to see it before I'd pass my judgement on it.

Keep up the good work.
Yup, I agree with what Ryan said. Charles, I am still waiting for a response to how you are going to make a larger than stock pulley lighter than the smaller underdrive ASP offers from the same material while retaining strength and reliability?

Paul

[Magnum Powers]

Yup, I agree with what Ryan said. Charles, I am still waiting for a response to how you are going to make a larger than stock pulley lighter than the smaller underdrive ASP offers from the same material while retaining strength and reliability?

Paul
These kinds of things are made of 6061 T6 aluminum billet. If there are people interested in testing a few prototypes I can work something out. Then again it is not a problem to beef it up a bit and come out with a 3 pound pulley that’s a very conservative design, what the heck, it would still be half the weight of the stock one.

[Melon]

I may be interested in an OD Crank pulley, but price is a factor, as far as bang for the buck. I would love to see it done in red to match my 'Bird, but if I had to vote - I'd go with either a polished finish or black.

Depending on what your look for for a test vehicle, I would offer mine as a "guinea pig" to test the pulley.

-Andy "Melon"

[David Neibert]

Charles,

It sounds good except, I don't want to give up my polished underdrives. I'm also a little concerned about spinning the jackshaft pulley faster, because if the bearings fail you can't replace them.

How about making a better flowing intake manifold adaptor (casting that connects lower IC tube to intake manifold). I like the one Randy Baker was making, but I don't want to rework the opening on my intake manifold. The stock casting seems to be very restrictive near the bend by the fuel rail and after seeing what you did on the inlet plenum, I know you could make similar improvements to the intake adaptor.

David

PS: It would also be nice if you could polish it to match all my other MP parts.

[Magnum Powers]

Charles,

It sounds good except, I don't want to give up my polished underdrives. I'm also a little concerned about spinning the jackshaft pulley faster, because if the bearings fail you can't replace them.

How about making a better flowing intake manifold adaptor (casting that connects lower IC tube to intake manifold). I like the one Randy Baker was making, but I don't want to rework the opening on my intake manifold. The stock casting seems to be very restrictive near the bend by the fuel rail and after seeing what you did on the inlet plenum, I know you could make similar improvements to the intake adaptor.

David

PS: It would also be nice if you could polish it to match all my other MP parts.

David, are the bearings failing becoming a "big" issue now days? I could look into it and see if there is anything I could do to help. I could design and cast a new intake manifold adaptor but I'm not sure what the demand would be. Getting something like that into production costs a lot so I would need a lot of sales just to break even. Let me know.

Charles

[supercatxr7]

How about a whole new manifold and intake adapter? Big gains could be made with the right design.

[David Neibert]

David, are the bearings failing becoming a "big" issue now days? I could look into it and see if there is anything I could do to help. I could design and cast a new intake manifold adaptor but I'm not sure what the demand would be. Getting something like that into production costs a lot so I would need a lot of sales just to break even. Let me know.

Charles,

No I don't think the jackshaft bearings are failing very often. It's just one of those things that if it does go, your pretty much screwed and you have to locate a used accesory bracket to get going again. I don't think spinning it 10% faster really makes a whole lot of difference, but thought it was worth considering.

I don't want to hi jack this thread talking about other parts, but I'll bet you could sell alot of intake adaptors if you could improve the airflow 25-30% and keep the price around $250. Might be worth looking into, if you haven't already.

David

[BT Motorsports]

David, are the bearings failing becoming a "big" issue now days? I could look into it and see if there is anything I could do to help.
Charles
Charles, we have not seen an abundance of bearing failures for the jackshaft pulley, in fact, I dont recall more than maybe a dozen reports on the BBS over the past few years. Most just replace it with a used one since they can be had for little cost. Bill Embree has been manufacturing bearing assemblies and rebuilding brackets for quite some time now ........
http://www.bluetonguemotorsports.com/BTMParts/images/NewOldBearingst.jpg
http://www.bluetonguemotorsports.com/BTMParts/remanjsa.htm

I have one on my 93 which has been turning around 21% overdrive for the past 30k miles with no issues to report. I think you would have more of a market if you could produce a bearing assembly for retail sale to the public which they could install themselves since Bill does not offer the part without installation at this time.

I agree with David, if you could produce a significantly improved return adapter and show significant gains at a resonable cost, you would have a great market for it.

Paul

[Ryan A Harris]

I would look at this way:

Think of all the inlet plenums MP has made and sold. I would like to think about 85% of that number, would want a new return plenum as well.

Not to take away from the pulley here. Its a good idea. I'd be willing to test and dyno one for ya.

The jackshaft bearing would be nice to have. Maybe a new design on the old accessory casting? Cut out the old bearing, machine a new daimeter, and press in a new bearing?

[Magnum Powers]

I would look at this way:

Think of all the inlet plenums MP has made and sold. I would like to think about 85% of that number, would want a new return plenum as well.

Not to take away from the pulley here. Its a good idea. I'd be willing to test and dyno one for ya.

The jackshaft bearing would be nice to have. Maybe a new design on the old accessory casting? Cut out the old bearing, machine a new daimeter, and press in a new bearing?
Thanks for the feedback guys! I have been looking at the return plenum/adaptor since my last post and have been talking with David via pm. I can see the restrictions and there are improvements that can be made. I am not sure how much hp those improvements amounts to however. Testing will need to be done to determine that.

Cheers,
Charles

[David Neibert]

Thanks for the feedback guys! I have been looking at the return plenum/adaptor since my last post and have been talking with David via pm. I can see the restrictions and there are improvements that can be made. I am not sure how much hp those improvements amounts to however. Testing will need to be done to determine that.

Cheers,
Charles

Charles,

If you can document gains similar to underdrives or lightweight jackshaft pulley (10-15 rwhp) on the average SC, I believe that would be enough to justify a $250 selling price. I agree with Ryan about the number of people who would be likely to buy one. I would also be willing to use my SC for dyno testing.

David

[DamonSlowpokeBaumann]

My two cents,

I believe the lightning and Cobra have no jackshaft pulley thus making a larger crank pulleyfor increased boost with no slippage the only way to go.

Still think the Jackshaft OD is the best way on an SC.

Common failures for Jackshaft bearings are when a belt shreds and gets stuck up in there.....MMhmm yup..ASK ME I KNOW!

[RedSCSpeedster]

dont know if a biger crank pulley is the way to go, put to much stress on the end of the crank, if you can make jack shafft pulleys, might be the way to go, if you can make the crank pulleys smaller and lighter that would be beter on the crank, the under drive pulley set has a light wight crank pulley that works well, i have made a jack shft and a idler pulley to try for more od drive and have fond that i may have to much od, and we are talking about 6000 crank seed and 30000 at the blower, i have a few pics of some of the the pulleys i am working with, and the big thing is the price of the parts you can make, i would like to make a jack shafft pulley that can be made around 100 bucks or so and the od size to fit any ones needs,

[David Neibert]

30,000 rpms is way to fast.

David

[Magnum Powers]

dont know if a biger crank pulley is the way to go, put to much stress on the end of the crank, if you can make jack shafft pulleys, might be the way to go, if you can make the crank pulleys smaller and lighter that would be beter on the crank, the under drive pulley set has a light wight crank pulley that works well, i have made a jack shft and a idler pulley to try for more od drive and have fond that i may have to much od, and we are talking about 6000 crank seed and 30000 at the blower, i have a few pics of some of the the pulleys i am working with, and the big thing is the price of the parts you can make, i would like to make a jack shafft pulley that can be made around 100 bucks or so and the od size to fit any ones needs,

I agree with David, 30,000 rpm is waaay too fast. A pulley system that gives a reasonable amount of overdrive and does not slip should be the goal.

[RedSCSpeedster]

yes 30000 rpms is to fast, but i can make other jack shaft pulleys that will work the blower at lower speeds and i think it would be cheper to make then a ckank pulley, if you make that crank pulley bigger, you run the chance of haveing it out of balance and haveing crank fail, if have the jack shaft out of balace you have a jack shaft bearing fail, and a jack shaft bearing is easer to fix then a crank , the only thing is, i dont have the time to make a lot of thes pulley, i have made two in the last two monts or so,

[David Neibert]

That tensioner pully looks interesting...what's it made out of and how did you make it ?

David

[RedSCSpeedster]

the idler is a old stock pulley with a poly carben typ plastic pressed on to it, i know this is some asom plastic i have see it wear groves in steel befor it wears , i needed to make my idler pulley biger to put more tention on my crank to jack shaft belt, if it works i plan too make the hole thing out of this stuff with new bearing in it as a replacement part.

[DamonSlowpokeBaumann]

David its a sleeve of that material he was talking about..Fits over stock pulley.

Still think the jackshaft is the best way to increase boost

[Randy N Connie]

I bought a March under drive pullies from SCP and the crankshaft pulley
was underdrive for the accessories and overdrive for the jackshaft.

I called Bill E. and we compaired measurements.And he did not know how
or why this pulley was made different.He offered to take it back,but I
chose to keep it.

I run this OVERDRIVE & UNDERDRIVE march pulley set with a Ryan Harris aluminum jackshaft pulley hooked to a machined down 10% SCP pulley.
I have not notice any belt slippage.But then I have less back pressure
than most to cause belt slippage.

So the OD pulley you want to make works just fine for me.For about 5000 miles .

But you may want to give some thought to a underdriver/overdrive pulley set.

I already have molds for a intakemanifold-plenum.Just have a little polishing
left to do on them.And rebuild a couple jigs to hold the plenums for machining.
I have looked into casting a manifold,with bolt on top,This is so I can port
the inside better.And make two tops to bolt to the manifold bottom.One top
for the M90, M112, AR set up for air to air,and another bolt on top for the AR,M90,M112 inverted with air to water.Both manifold will be tall than stock.


RANDY

[ThunderDave]

Hot Rod TV had a Cobra on not too long ago and they had a quick change overdrive pulley kit on it for the blower. I can't say for sure what the sizes were, but seems like 5% & 10% is what they were using.

So they do have more options for overdriving the blower than the crank pulley.



David

[CMac89]

I would be very interested in an intake manifold and return plenum modifications. I know Randy only made a couple of them and thats about all that was experimented with.

Seeing as how the intake manifold hasn't really been something worked on that much, People would buy it because it probably makes more HP than a ported blower with the MPinlet plenum. The best way to do it is make an intake manifold like Randy's and return plenum, and get dyno results and that will determine your sales.

XR7 Dave have the autorotor package going on at $3200 and many people are demanding it. If someone is willing to pay that big money for another blower than i'm sure intake manifold and return plenum redesigns will sell good too.

I bet Dave Neibert's car will go from 11.60's to 11.10's or 11.20's. Coy Miller would run 10.50's, atleast with the S-Port that he ran at the shootout.

About the crank pulley, are you talking about making one so people would buy this as extra overdrive or just another way to increase boost other than jackshaft pulley. I know that you can buy a 10% overdrive blower pulley and 5% jackshaft being a total of 15%. Correct me if i'm wrong, but the 94/95 style superchargers produce more overdrive than early styles stock for stock. So a 5% is an 8%, that would make a 15% around 18%- 20%? I don't know if anybody would go more overdrive than that.

You get an aluminum crank pulley if you buy the underdrives. The jackshaft pulley is $140 any way you go with overdrive, so you would have to make the crank pulley less than that to sell. If you made a crank pulley in 5% i would buy it. I would have a stock size aluminum jackshaft pulley and a 5% blower pulley to go with it. Perhaps i could go 5% blower pulley, 5% jackshaft, and 5% crank pulley with frontmount intercooler. I would think this setup would have less belt slippage if at all.

Casey

[Magnum Powers]

I would be very interested in an intake manifold and return plenum modifications. I know Randy only made a couple of them and thats about all that was experimented with.

Seeing as how the intake manifold hasn't really been something worked on that much, People would buy it because it probably makes more HP than a ported blower with the MPinlet plenum. The best way to do it is make an intake manifold like Randy's and return plenum, and get dyno results and that will determine your sales.

XR7 Dave have the autorotor package going on at $3200 and many people are demanding it. If someone is willing to pay that big money for another blower than i'm sure intake manifold and return plenum redesigns will sell good too.

I bet Dave Neibert's car will go from 11.60's to 11.10's or 11.20's. Coy Miller would run 10.50's, atleast with the S-Port that he ran at the shootout.

About the crank pulley, are you talking about making one so people would buy this as extra overdrive or just another way to increase boost other than jackshaft pulley. I know that you can buy a 10% overdrive blower pulley and 5% jackshaft being a total of 15%. Correct me if i'm wrong, but the 94/95 style superchargers produce more overdrive than early styles stock for stock. So a 5% is an 8%, that would make a 15% around 18%- 20%? I don't know if anybody would go more overdrive than that.

You get an aluminum crank pulley if you buy the underdrives. The jackshaft pulley is $140 any way you go with overdrive, so you would have to make the crank pulley less than that to sell. If you made a crank pulley in 5% i would buy it. I would have a stock size aluminum jackshaft pulley and a 5% blower pulley to go with it. Perhaps i could go 5% blower pulley, 5% jackshaft, and 5% crank pulley with frontmount intercooler. I would think this setup would have less belt slippage if at all.

Casey

The reason I am thinking of a overdrive crank pulley is because it is the best technical way to produce more blower overdrive without belt slippage. As people have experienced smaller blower pulleys have a tendency to slip because the belt/pulley surface area is reduced. If instead the crank pulley is made larger you can have more overdrive and more contact area at the same time.

Charles

[DamonSlowpokeBaumann]

@&*# Jackshaft!

[Randy N Connie]

CMac89 I am still making manifold & plenums mods.
you can buy the modification by contacting me or
David Dalke.

Paul the two virus e-mails you sent me last night
did not work.


RANDY

[CMac89]

CMac89 I am still making manifold & plenums mods.

RANDY
Oh okay. I wasnt for sure. How much do you do them for?

Magnum powers,

Thats why i said that it would have less belt slippage if at all and that i would buy it.

[Mike8675309]

Personally I don't know that there is any real difference. I feel like the key to the product would be both single parts and a complete set of parts.

I.E., a new crank pulley including a new jack shaft pulley and a new SC pulley. Having new A/C compressor, Power steering and Water pump pulley would be a plus. Or at least an appearance that fits with the existing makers of other pullies.

Using a spreadsheet that was posted here (http://www.sccoa.com/forums/showthread.php?t=54113&highlight=pulley) using the 89 pulley as a starting point:

At 6500rpm Jackshaft speed = 11421rpm
Increase Crank pulley for a 10% increase in SC speed gives a Jackshaft speed of approx 12579 rpm. A change of just under 10%. I may be wrong, but for the design of those jackshaft bearings, it doesn't seem like much extra load, if any.

As some of Ryan's work has validated, there is real benefit to decreasing the rotating mass hanging off the front of the engine.

I'm going to be shopping for pullies late this winter. The largest issue I see related to such an endevor is many different options and trying to pick the right ones that will work well together.

I love to see more options. And as far as final finish, I'd go with the natural color. And best would be if you can work with individuals to custom color pieces at an additional cost.

[Magnum Powers]

Thanks for the feedback Mike.
Charles

[Greg Coleman]

I remember asking Charles about the return plenum and intake manifold many many moons ago as I see this as a restrictive point once one has all the other goodies before this point maybe new castings could be made if there is enough interest. Way to go Charles in keeping our interests in mind! :D Just my 2 cents.

[Nisan]

I've got an '86 'stang with a '90 SC engine and requested to try one. No response. Anybody else?

I was upset a couple of weeks ago w/performance. Changed tires/rims(Centerlines..super light! & 265/50/15s out back) set timing/cam sensor(even though i was told this did nothing i am not so convinced!) and adjusted the TV cable. Runs great now.

Waiting on response for trial pulley.

[seawalkersee]

I already have an underdrive kit on the car. Right now the most boost the thing makes is 10 psi. I think I am going to go with the jackshaft and the SC pully. I think the Crank is a good idea but is the overdrive the main reason or is it the weight of the pully?

Randy, is this the mod where you cut the center triangle out? Last I heard there were no numbers on the mod. What is the mod made on the plenum?

Chris

[Randy N Connie]

The plenum is made wider.And I change the shape of the inside of the plenum
for better flow.

I talked to Charles W. he is thinking of making a bigger plenum that will
bolt to the stock IC tubes.I am going to send him some drawings and
pictures when I get the time.So he can copy what I have been doing.


Randy

[seawalkersee]

So is removing the triangle the intake mod? How much does it make? How much (cost) for the plenum mod?

Chris

[Randy N Connie]

Chris it take about 6 to 7 hours to just remove the triangle and weld
in a new aluminum peice.When I finish you cannot tell there were
ever a triangle casted in the manifold.I only remove the triangle
on the Stage III. I will remove the triangle in the stage I & II
If the sc owner wants it out.

It takes about 55 to 60 hours to do the plenum and manifold mod.
With some porting.This is for the stage I & II.The stage III takes
about 100+ hours.So I am doing this for less than $10.00 hour
because I do have material and tooling cost not listed.It cost
around $100.00 for the stage I & II,And $200.00 for the stage III.
And around $60,000.00 in tools to build these parts.

Thanks Randy

[seawalkersee]

What kind of gains would you expect to see on .444 cam, 1.73 rr, ported heads, mid length headers, underdrive pullys, CAI, and 38 lb injectors, all through a 5 spd? The car makes 308 ft lbs and 283 at the wheels now.

I installed the 73 mm MAF body but it ran soooo lean that it would fall on its face when you tried to take off. I am gonna get a larger t-body and raised top eventually. I think I really need to step up to 42 lbs injectors but still runnin with out a tune at present. It only gets like 16-18 mpg now. I think a tune will help it out a lot.

Chris

[DamonSlowpokeBaumann]

lil itty bitty cam..Change it! hehe

[seawalkersee]

Other things in the works before I get there. I have to fix the v-8 car FIRST. I really need that thing runnin before I tear another one down. And its not the size that counts...well thats what she tells me...

Chris

[victor malvar]

Merry Chistmas Charles,
I have spoken with you about a lot of these pulleys and other ideas. I will call you later. I have some ideas as what people want! I get many requests on different parts they would like to have us build. Maybe we could talk about a couple in particular... I'm in need of some parts ASAP. I think we could discuss some of these issues and ideas. I understand where they are coming from. At least some of them. Anyway the SC community wants a NEW part at a reasonable price that will increase the performance of our SC's that is not already being made by some of the members. There are so many guys working hard to make their own Mfg. products and are suceeding at it very well.This would hurt some of the members that study these cars and have come out with some very good parts indeed. I know you carry great Blowers, Plenum, TB, etc. Magnum Powers is a very reputable company. We all want to see you make something to compete with the New blowers in performance and price. I know you want to satisfy us all. This is my own opinion. Thank you for your contributions and support of the SC and XR7 community.Happy Holidays to you, your family and to all the great membert of SCCoA. May we all have a prosperous, healthy and HAPPY NEW YEAR!!
Victor and Diane

[mannysc]

i made a overdrive crank pulley by welding a accessorie pulley over the stock pully some machineing was req, work fine no vibreations no broke crank not 10% but still works fine

[slowpoke]

i can see where some peeps might see how the larger crank pulley would add more stress on the crank, however i dont see how it would be enough to worry about, i think u have a great idea and would love to here from u once testing is done:D

btw ive heard some about the 10% pulley slip, ive never had mine slip yet. maybe im just lucky:cool:

[jc91sc]

Has this topic and idea been revived?

[Mike8675309]

These parts are available for purchase at the magnum powers website.
www.magnumpowers.com