Valve lift question
Thread Starter
Instructor
Joined: Mar 2003
Posts: 176
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From: Holtsville NY
Valve lift question
What is the highest usable, street valve lift on an LT1 hydraulic roller? Assuming the valvetrain is equal to the task (ie springs, pushrods, rockers etc.) could you use a cam that ends up at .605 intake and .624 exhaust lift with 1.6 rocker ration?
Safety Car
Joined: Jul 2001
Posts: 4,871
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From: Detroit's West Side MI
Hmmm. I've seen several LT1 head flow sheets up to .650, but that doesn't mean that it's possible to actually use that much lift. My own cam is .574 / .571 (with 1.6 RR) and I discussed going higher, but not to the lift you're talking. Why so much bigger on the exhaust than intake?
Race Director
Joined: Jan 2002
Posts: 12,263
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From: O'Fallon Missouri
Idles at 800 rpms with a noticeable lope. A very streetable camshaft. Can lug the car around at 1200 rpms without a sign of cam surge.
I ran a 212/224 521/536 112+2 camshaft before this one, and the hp/tq curve was nearly identical until 5000 rpms, where this camshaft really takes off.
I ran a 212/224 521/536 112+2 camshaft before this one, and the hp/tq curve was nearly identical until 5000 rpms, where this camshaft really takes off.
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Hmmm, that's where I need it.
Oh well, it's not like mine will be a slouch up there. The duration is 230/236 and the lift is mentioned above. If I could get the damn car running I'd tell you all about it.
Oh well, it's not like mine will be a slouch up there. The duration is 230/236 and the lift is mentioned above. If I could get the damn car running I'd tell you all about it.
Last edited by ScaryFast; Nov 14, 2005 at 06:26 PM.
Thread Starter
Instructor
Joined: Mar 2003
Posts: 176
Likes: 0
From: Holtsville NY
STL94 I think you are using the intake lobe I am looking at. Comp Cams lobe #3192. I am looking into a custom cam to match to ported heads. It's a little far off but I figure the extra research could be a good thing. I was thinking 224 intake at .605 lift, 236 exhaust at .624 lift on 114 LSA. I am hoping for pretty good street manners (mostly just vaccum and emissions passing) I am okay with lope and a little surge. I figure really good springs, and shaft rocker arms and the lift should be stable.
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Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Originally Posted by ScaryFast
The duration is 230/236 and the lift is mentioned above.
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Originally Posted by STL94LT1
Your camshaft with 230/236 duration will idle rougher than my 224/230, even though you have less lift. It will probably even rev higher.
Anyone have a formula to calculate the volume of gasses brought in or expelled based on these two varaibles (lift and duration)? I'd be curious to see which plays a bigger part, the length of time the valves are open or how far they're open.