Compression test + cam input results inside...
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From: Port Tobacco, MD
Compression test + cam input results inside... Looking for cranking compression data + cam specs. If you have done a compression test and recorded cranking compression please list data and the cam specs.
Phillip
Phillip
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From: Port Tobacco, MD
Re: Compression test + cam input results inside... I'll start....
Comp Cams 230/230 XE 114lsa + 11.4:1 = 215-220 psi
Comp Cams 230/230 XE 110lsa + 11.4:1 = 210-215 psi
Comp Cams 232/238 XER 111lsa + 11.25:1 = 200-205 psi
Comp Cams 230/230 XE 114lsa + 11.4:1 = 215-220 psi
Comp Cams 230/230 XE 110lsa + 11.4:1 = 210-215 psi
Comp Cams 232/238 XER 111lsa + 11.25:1 = 200-205 psi
I can shift faster than you.
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From: Baton Rouge, LA
Re: Compression test + cam input results inside... You should also list the intake centerline as well in helping compare different cranking compressions with different cams/compression ratios.
Jason
Jason
Re: Compression test + cam input results inside... Comp 218/218, .528 lift, 114 LSA, 114 ICL, stock compression ratio:
225 psi with 6 degrees of advance
215 psi with 2 degrees of advance
225 psi with 6 degrees of advance
215 psi with 2 degrees of advance
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From: Port Tobacco, MD
Re: Compression test + cam input results inside... Interesting results....Compression test needs the TB to be open and 3-6 cranks until you see a full reading.
Phillip
Phillip
I did a search and found this old thread...figured I'd add to it.
I did a compression check on my 2002 Z28 with a Thunder Racing 227/224 reverse split cam and 10.8:1 compression. I think it's 114lsa with three degress of advance ground in. I had seven cylinders hit 240 and one hit 245. They all hit over 150 on the very first crank. Can anyone explain why these are so high? I've been doing a search and haven't found any with numbers like that.
I used a Mac gauge so it wasn't some crappy Autozone off brand or anything. The heads are 5.7L milled .038 Am I running more compression than I thought?
Chad
I did a compression check on my 2002 Z28 with a Thunder Racing 227/224 reverse split cam and 10.8:1 compression. I think it's 114lsa with three degress of advance ground in. I had seven cylinders hit 240 and one hit 245. They all hit over 150 on the very first crank. Can anyone explain why these are so high? I've been doing a search and haven't found any with numbers like that.
I used a Mac gauge so it wasn't some crappy Autozone off brand or anything. The heads are 5.7L milled .038 Am I running more compression than I thought?
Chad
You can crank it 5 times or 500 times and compression will be the same so that is not a factor. Just crank it until there is no more increase in pressure on the gauge.
It is best to do it while the engine is at operating tempurature but we all know that tight spaces and hot headers equal burnt hands and forearms.
It is best to do it while the engine is at operating tempurature but we all know that tight spaces and hot headers equal burnt hands and forearms.
Originally Posted by Justin99TA
I did to of my cylinders last night with the throttle body closed and only got 155 160????
