matching up parts to CR
hi everyone, i was recently reading another post on here and it was mentioned that this member did not have enough compression for the cam that they were using. this got me thinking about my own combo and how recently i've figured out my cr to possibly be less than 9:1. i say possibly because i cannot find an exact number of cc's for the 4 relief valves in my pistons. using the calculators in the knowledge base i figure to be in the 8.75: - 9.1:1 range. i've been told anywhere from 8 cc's to 15 cc's.
my question is... can someone please tell me how you determine if the cr is appropriate for the cam. or if my cam is a good match for my combo. i have been playing around with the idea of stroking the engine and also reducing my quench area to about .050 from .090(rebuilder pistons .020 in hole)
my combo ... 355 sbc with ported vortec heads, air gap intake, holley 750,
228 @ .050 with 525 lift hyd roller cam, cr 8.75-9.1:1. th350 w/ 3000 stall, 4.10 gears and the car weighs about 3700 lbs without me in it. a note about the cam, because of a high int-ex ratio on the heads(85%) i went with a cam that has same specs for both intake and exhaust.
anyways, just wondering if my cr is too low and what kind of gains could i see by upping it. last fall the car made 305 rwhp but i had some problems with my fuel pump, distributor and running hot. engine temp was about 215. i've since bought parts to hopefully solve all those problems.
thanks for your time.
keith
hi everyone, i was recently reading another post on here and it was mentioned that this member did not have enough compression for the cam that they were using. this got me thinking about my own combo and how recently i've figured out my cr to possibly be less than 9:1. i say possibly because i cannot find an exact number of cc's for the 4 relief valves in my pistons. using the calculators in the knowledge base i figure to be in the 8.75: - 9.1:1 range. i've been told anywhere from 8 cc's to 15 cc's.
my question is... can someone please tell me how you determine if the cr is appropriate for the cam. or if my cam is a good match for my combo. i have been playing around with the idea of stroking the engine and also reducing my quench area to about .050 from .090(rebuilder pistons .020 in hole)
my combo ... 355 sbc with ported vortec heads, air gap intake, holley 750,
228 @ .050 with 525 lift hyd roller cam, cr 8.75-9.1:1. th350 w/ 3000 stall, 4.10 gears and the car weighs about 3700 lbs without me in it. a note about the cam, because of a high int-ex ratio on the heads(85%) i went with a cam that has same specs for both intake and exhaust.
anyways, just wondering if my cr is too low and what kind of gains could i see by upping it. last fall the car made 305 rwhp but i had some problems with my fuel pump, distributor and running hot. engine temp was about 215. i've since bought parts to hopefully solve all those problems.
thanks for your time.
keith