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rapper33142
12-12-2009, 12:22 PM
What size cam do you need to get a nice cam lobe like this one ?

http://www.youtube.com/watch?v=i_1hHMo1AZs

90turbo1
12-12-2009, 01:26 PM
lots of overlap. you need to look at cam specs.

rapper33142
12-12-2009, 07:04 PM
That what I want to now so I can get one or maybe I now a custom one

rapper33142
12-13-2009, 12:12 AM
will a 520 cam make it lobe

fastsc92
12-13-2009, 02:27 AM
I can tell you it's going to be a 210-220 duration, .493 lift. I know because it's my car!:p Not sure who posted that up there....

thunderkid84
12-13-2009, 03:13 AM
JR, when you're ready for heads and cam just talk to xr7dave.

frdlvr30
12-13-2009, 03:43 AM
The amount of overlap is what causes your "rough idle". You can figure this with this equation: Intake duration + Exhaust duration, divided by 4, - LSA, x 2. The more overlap, the rougher the idle. Lobe seperation angle dictates everything. Lobe speration angle is the measurement angle between the intake lobes max lift and the exhaust lobes max lift. It is measured off of cam degrees, unlike duration which is dictated by crankshaft degrees(Crank spins twice as fast as the cam) The lower the angle, the greater the overlap and the more lope you are going to have. It also plays into performance characteristics. More LSA tends to give more torque, less high rpm power, and less vacuum at idle for obvious reasons.

XR7 Dave
12-13-2009, 10:35 AM
That cam shouldn't have any lope at all. Sounds like a lean idle condition to me. :p Maybe it was ground on a 110 LSA?

fastsc92
12-13-2009, 11:02 AM
That cam shouldn't have any lope at all. Sounds like a lean idle condition to me. :p Maybe it was ground on a 110 LSA?
Certainly not a lean condition.:p My cam card shows a 112 LSA, but it's a regrind, so I'm not sure if they actually profiled it after it was ground, or just assumed it was 112. :confused: It's been idling the same way for over 5 years.

http://img.photobucket.com/albums/v325/fastsc92/e561b78d.jpg

XR7 Dave
12-13-2009, 11:25 AM
I knew I'd get crap for saying that. I'm not sure why yours lopes like that. I've used that cam profile many times and it generally idles almost dead smooth. Just don't want the guy to be disappointed. ;)

fastsc92
12-13-2009, 11:31 AM
I knew I'd get crap for saying that. I'm not sure why yours lopes like that. I've used that cam profile many times and it generally idles almost dead smooth. Just don't want the guy to be disappointed. ;)

It does have a nasty lope for some reason, and like you said, given its specs...it shoudn't sound that aggresive. I knew you were just bustin my [email protected]:cool:

nickleman60
12-13-2009, 11:50 AM
Should my new cam have a good lope? .588 /.600 lift, 230/236 duration, 112 lsa

Who's car is this? I noticed the video on the right when I clicked on the youtube link.

http://www.youtube.com/watch?v=DlTwK9WaeQU&feature=related

David Neibert
12-13-2009, 01:17 PM
Should my new cam have a good lope? .588 /.600 lift, 230/236 duration, 112 lsa

Who's car is this? I noticed the video on the right when I clicked on the youtube link.

http://www.youtube.com/watch?v=DlTwK9WaeQU&feature=related

It's Ted Lyons old car...looks like the new owner did some work because I don't think it had that intake manifold or the liquid IC when Ted owned it.

David

thirdbird
12-13-2009, 06:52 PM
http://www.youtube.com/watch?v=DlTwK9WaeQU&feature=related

Best sounding 5.0 to date IMO.

Fast SC I like your idle a lot, car sounds great!

frdlvr30
12-13-2009, 10:06 PM
[QUOTE=thirdbird;856465]Best sounding 5.0 to date IMO.

Fast SC I like your idle a lot, car sounds great![/QUOTE
Didnt that car have a 331 or 347 stroker in it?

rzimmerl
12-13-2009, 10:16 PM
Should my new cam have a good lope? .588 /.600 lift, 230/236 duration, 112 lsa

Who's car is this? I noticed the video on the right when I clicked on the youtube link.

http://www.youtube.com/watch?v=DlTwK9WaeQU&feature=related

Maybe, I've got more lift, just tad bit less duration, same lobe sep as you and you can barely tell its got a cam, mainly because its idling 900 RPM.

Regul8r
12-13-2009, 11:06 PM
think this guy has some issues with his rear end!

http://www.youtube.com/watch?v=8kploq0Evl4&feature=related

All that smoke was from ONE WHEEL! Posi not working very well.

nickleman60
12-13-2009, 11:16 PM
Maybe, I've got more lift, just tad bit less duration, same lobe sep as you and you can barely tell its got a cam, mainly because its idling 900 RPM.

The cam in the car now has .520/.520 lift, 218/224 duration, 114 lsa, you can hear a little bit of lope. I hope the new cam brings some extra hp before it brings a bigger lope.......:rolleyes:

thirdbird
12-14-2009, 12:27 AM
Didnt that car have a 331 or 347 stroker in it?

"Nice 5.0 T-bird Super Coupe with a Vortech supercharger making 14psi of boost. "

You could be right though, it makes sense sounding that way I never heard one sound like that.

rapper33142
12-16-2009, 09:45 AM
So what Specs should I get guys for it to be noticeable but still idle on its own

rzimmerl
12-16-2009, 09:53 AM
You'll need to contact your cam guy so he can match the grind with your existing parts and needs