What is my compression ratio?
What is my compression ratio? What is my compression ratio? I have an l33 5.3 aluminum engine with factory flat top pistons. The heads are texas speed tage 2.5 (243 casting) heads that have a 65cc cc, and a .060" cometic head gasket. Can someone tell me the correct compression ratio?
Well if that is the truth, i need to call and cancel the gasket. Texas speed figured up 9.7:1. My goal is 9.5:1 compression. I am going to be running 10-15 lbs of boost one e85. I am not sure on the bore size. I just called into texas speed and ordered those heads and cometic gaskets. I told me my target compression ratio. I was just questioning it because i had called them once before and they told me a different compression ratio with the same heads.
Are you going to drive this on the street ? If so I would keep the compression around the 10:1 mark. 15#'s on e-85 will be just fine on 10:1 compression.
I used 3.90 bore on your gaskets when doing the compression ratio calculator so if that value is bigger it will drop the # some. If Texas speed told you 9.7:1 that's going to be very close.
I used 3.90 bore on your gaskets when doing the compression ratio calculator so if that value is bigger it will drop the # some. If Texas speed told you 9.7:1 that's going to be very close.
Are you going to drive this on the street ? If so I would keep the compression around the 10:1 mark. 15#'s on e-85 will be just fine on 10:1 compression.
I used 3.90 bore on your gaskets when doing the compression ratio calculator so if that value is bigger it will drop the # some. If Texas speed told you 9.7:1 that's going to be very close.
I used 3.90 bore on your gaskets when doing the compression ratio calculator so if that value is bigger it will drop the # some. If Texas speed told you 9.7:1 that's going to be very close.
It was 9.47:1 so 9.5:1 is what I got, .2 isn't going to make or brake any thing. Again I guessed at the gasket bore because I cant find the .060 thick gasket on tsp web sight, it might be smaller than the 3.90" bore I used in the calculator.
You might want to drop it down to a cometic .040 gasket or a GM MLS .051 gasket.
You might want to drop it down to a cometic .040 gasket or a GM MLS .051 gasket.
Last edited by conan; Aug 6, 2014 at 10:30 PM.
http://www.csgnetwork.com/compcalc.html
3.622 Stroke
3.77 Bore
.060 gasket thickness
65cc Heads
0 for flat top pistons
.008 piston out of hole
3.622 Stroke
3.77 Bore
.060 gasket thickness
65cc Heads
0 for flat top pistons
.008 piston out of hole
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http://www.csgnetwork.com/compcalc.html
3.622 Stroke
3.77 Bore
.060 gasket thickness
65cc Heads
0 for flat top pistons
.008 piston out of hole
3.622 Stroke
3.77 Bore
.060 gasket thickness
65cc Heads
0 for flat top pistons
.008 piston out of hole
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