View Full Version : Gauging interest on 10% - 15% JS pulleys

06-30-2008, 11:18 PM
Hey guys, I've been talking to a machinist who might be interested in making some hard anodized 10% JS pulleys for us. Might be able to get different OD percentages as well, say 15% OD. Looking to gauge interest here and see how many of you would be interested.

Initial estimates looks to be about $150 per pulley + shipping if we get 30 people in, but that could change based on total people involved, price of aluminum, etc. So let me if you're interested, what percentage OD you'd like to see, at what price point you'd like to see these at, and how many you'd be interested in purchasing. Thanks!


07-02-2008, 11:08 PM
Wow. 52 views and not a single person said anything. No one has an opinion on this at all?

07-03-2008, 12:05 AM
just bought a used 10 percent off of someone, if not i'd be in. maybe a 15 percent depending on price.

Kurt K
07-03-2008, 07:41 AM
So is the 10% going to be accomplished by reducing the smaller side of the pulley, increasing the bigger side of the pulley, or both? 8-rib or 10 rib? Will stock belts work, or will new belts need to be purchased?

I won't know if I need a 10% JS pulley for another month or two.

07-03-2008, 03:32 PM
These are going to be 8/7-rib like stock. I thought about having these made as 10/8-rib, but MP already makes them. Right now I'm just looking to make these to fill the void of no 10% JS pulleys in the market, plus the added bonus of them being hard anodized*.

Getting to 10% will likely be a reduction on the crank side and enlarging on the blower side. The one I'm using for measurements (whose vendor I still have no idea - no markings) has the blower side enlarged about as far as possible with barely enough clearance to install the belt.

I use a stock size crank-JS belt right now (K070425). It's near the end of the tensioner range on the loose side, but my belt is pretty worn out and needs to be replaced.

On the blower side I'm runing a Gates K080408, but I also am running a 3.275" 94/95 blower pulley. Using a stock early model blower pulley (~3.1"), you will run a K080400. I'm going to take a guess that a 5% blower pulley (~2.9") will use a K080392 (stock size), but I may be a bit off.

I'll have to do the math, but running a pulley that uses a K070390 on the crank side and maximizing the blower side pulley should get us around 15% OD out of the JS. Like I said, I'll have to do the math to check that.

*Sorry guys, but hard anodizing only comes in one color - black.

07-16-2008, 05:19 PM
what is going on with the 10% or 15% jackshaft pulley. i am interest in a 10 or 15% when they are done.

07-17-2008, 12:28 PM
Did you know the MP 10 rib JS pulley can be used with a stock 8 rib SC pulley.