318 compression test results
I would keep the 114 lobe center line for the stock 318 compression... It will have less overlap and a little higher cylinder pressures than the 108 LSA...
You sure about that?
Less overlap yes but that has got nothing to do with cylinder pressure.
I get
268/276/114 in at split overlap (112) will have an Ica of 66*
268/276/108 in at split overlap (106) will have an Ica of 56*
That is a 10 degree difference, and the Wallace predicts an easy 10psi LOSS for the 114*
At 800ft elevation; in an 8/1 318;
115.56psi on the 66* compared to ............ 127.58psi on the 56*
Is the Wallace wrong?
The Wallace also predicts P/V s of;
84 for the 114*cam, which is what a stock slanty makes, compared to
101 for the 108*cam, which is a tiny bit more than an 8/1, 273 makes(97)
The stock 318cam is a 240/248/112 and in at split overlap(110*) will have an Ica of 50*, pressure predicted to be 134psi,@8.0 Scr/@800ft, with a P/V of
110; which is:
31% better than the Wide LSA 340cam, and
8.9% better than the 108LSA 340 cam.
Is my math bad?
read about P/V here;
V/P Index Calculation