compression ratio change?
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
compression ratio change?
Keep in mind I know little about engines...
What would I do to change the comp. ratio of the LT1? I have the heads/
cam out now (mechanic does). Would it be something simple, like different
pushrods or something?
--I would only do this if it gives me more torque or hp (prefer torque).
What would I do to change the comp. ratio of the LT1? I have the heads/
cam out now (mechanic does). Would it be something simple, like different
pushrods or something?
--I would only do this if it gives me more torque or hp (prefer torque).
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: compression ratio change? (sothpaw2)
Thinner head gaskets, stock, I THINK, is .039, you could go down to a set of .029's from http://www.flatoutgaskets.com
I think you could gain @ .4 or .5., have him check for valve clearance first.
I think you could gain @ .4 or .5., have him check for valve clearance first.
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
Re: compression ratio change? (ld85)
Check out this site. Found it while trying to figure out my friend's compression ratio of a 318 he's building. Cool to play around with the numbers and figure out what's worth it.
http://www.csgnetwork.com/compcalc.html
Chris
http://www.csgnetwork.com/compcalc.html
Chris
Advanced
Joined: Apr 2002
Posts: 69
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From: Deerfield Beach FL
Re: compression ratio change? (okinawa86vette)
Stock head gaskets on the aluminum head is .051". As said above you can use a thinner gasket with no problem. Iron head LT1 in the Impalas used .029", available at a Chevy dealer. You should have no problem with piston to valve clearance with a stock block.
Ray
Ray
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Re: compression ratio change? (AJR)
My heads man asked me to buy (and I did) impala SS, 94-95 gaskets.
Maybe this is part of why.
What are the LT1 stock dimensions (bore, stroke, etc) for that calculator,
do you know?
Maybe this is part of why.
What are the LT1 stock dimensions (bore, stroke, etc) for that calculator,
do you know?
Team Owner
Joined: Sep 2001
Posts: 62,127
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: compression ratio change? (sothpaw2)
Gasket thickness is the way if other things are held constant, but it doesnt affect the ratio THAT much.
Increasing the combustion chamber size, and selecting a different piston are the usual ways.
But with an LT1, if you go much higher, youll be running 92+ octane forever by necessity.
LT1 is a 350 SBC, 4" bore x 3.48" crank.
I wouldnt do this to just increase power, its not going to affect it as much as you might think, while keeping the engine on pump-gas.
[Modified by vader86, 12:37 PM 5/16/2003]
Increasing the combustion chamber size, and selecting a different piston are the usual ways.
But with an LT1, if you go much higher, youll be running 92+ octane forever by necessity.
LT1 is a 350 SBC, 4" bore x 3.48" crank.
I wouldnt do this to just increase power, its not going to affect it as much as you might think, while keeping the engine on pump-gas.
[Modified by vader86, 12:37 PM 5/16/2003]
