Compression In Ca
02-21-2006, 11:18 PM
#1
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Compression In Ca What Compression ratio are you guys running on your NA and H/C Lsx cars in California on 91 octane?
Im trying to decide on what heads to run and Im either going to be at 10.6:1-10.8:1 or 11.3:1. I also plan on running a 200+ shot of nitrous.
Im trying to decide on what heads to run and Im either going to be at 10.6:1-10.8:1 or 11.3:1. I also plan on running a 200+ shot of nitrous.
02-22-2006, 02:52 AM
#4
to be honest i dont' know if it's diferent for LSX motors due to their improved combustion chambers and such. But 8.5 is the limit on a f.i. traditional SBC, assuming adequate quench. On a large cammed motor this can be as high as 12.x-1 static. I imagine one of the board's sponsors could answer the question pretty quickly.
02-22-2006, 12:43 PM
#6
i am running 11.8:1 in my 408, but i have a rather low DCR, because i am running a cam with alot of overlap, with allows me to run 91 octane 25 degrees advance, and 550rwhp, if you want to run high compression, your going to need a rather large cam, to take cylinder pressure when its at it peak which is at peak torque.
02-22-2006, 05:24 PM
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How much overlap should i be running on my 408?
Do you guys have any problems passing smog (the sniffer test) with a large duration cam in your 408's?
Do you guys have any problems passing smog (the sniffer test) with a large duration cam in your 408's?