Join Date: Aug 2003
Location: roanoke, virginia
Cam Timing VS. Cranking Compression... Cam Pro's Please Chime In.
Quick question.... I have a 347 with a blower. I replaced a N/A cam (TFS stage 3 .575/.593 236/248 @110 l/c) with a Comp blower cam (.603/.613 248/260 @114 l/c) I installed the new cam straight up (although comp said go 4 deg. advanced... duh!) now with the intake closing too late i'm only getting 130 psi cranking comp. (cold, forged pistons, throttle WOT, with all plugs out) I feel this is a bit low, don't you all think? now for my question... how much more cranking compression should I get with this cam degreed correctly? 4 degrees advanced (give or take) from where i'm at now? i realize the sooner the intake closes, the less compression is lost, but how much? thanks for any input in advance guys.