318 Build
The motor is stock 76 with the crappy smog 318 heads (63cc) I think factory specs have it at 8.5 Static Compression Ratio. I'm having trouble finding the actual size of the 308s chamber. (If you know or know where I can find out LMK) I've seen numbers in the 50s and 70s. I'm hoping it's smaller than the existing 63cc but I'm guessing not. I understand the Dynamic vs. Static. I'll need to find a calculator for that. Math and I never got along. Cam looks to be 480 lift 230 duration @ .050, advertised at 280. From that I can probably figure out who makes it. Either way it sounds like without basically making a closed chamber head I'm going to need a decent stall converter and a heavier foot. I'd rather not change the gears if I can help it. I would like to drive on the free way at under 4K RPM and keep my 8 1/4 in one piece. Thanks for the help, keep it com'n. Open to cam suggestions.
Intsall that cam into your low compression engine, against all better judgement. If it's a super slow rate of lift as that, this is what it will like;
Static compression ratio of 8.0:1.
Effective stroke is 2.52 inches.
Your dynamic compression ratio is 6.32:1 .
Your dynamic cranking pressure is 117.18 PSI.
V/P (Volume to Pressure Index) is 85........................................................85
A VP of 85 is absolutely miserably sucked out.
This is a "race cam". And it will forever be a race cam in a teener. This cam requires
Static compression ratio of 10.3:1.
Effective stroke is 2.52 inches.
Your dynamic compression ratio is 8.07:1 .
Your dynamic cranking pressure is 161.70 PSI.
V/P (Volume to Pressure Index) is 117.................................................117VP
Notice the VP, a measure of low-rpm performance is still way less than the stock cammed 318 with pumped up compression, which was 122.
nm9 has the right idea. If you want a tire fryer, AND comfortable hiway cruising, AND some midrange, And some top-end, from a 318; then you are gonna have to pump it up.
Or get a bigger engine,lol. You're trying to cover too many bases with too much of a weight penalty in the chassis. Kick 400 pounds out of that chassis, then the teener has a fighting chance of covering all the bases.
I see a big decision on your horizon.
