A fast-rate 272/280/110 will be close to the edge for pump gas
Installed at 104 for an Ica of 60* and with an Scr of 11.3@2500 ft the Dcr comes to 9.3 and pressure is predicted to be 185psi@163VP.
If you go down to 800ft, the pressure climbs to 194 and depending on your tuning skills, there may be times when the engine gets into detonation on anything but the best gas
Lets retard it to 106* for an Ica of 62*.. I get 182psi/158VP. Ok that should work.
If your intention is to stay at 2500, then you can run up to 200psi. To do that you would have to decrease the ICA or increase the Scr. The former means less Ica, and the latter means machine work.
The 285/110 has about 68* overlap, while the 272/110 has just 56, so the 272 won't idle as radically as the 285. If this is to be a city car, you can tighten up the 272/110 to as far as 272/104, and get back to 68* overlap for the sound. This will decrease the Ica to 56* and increase the cylinder pressure to a predicted 192psi@174VP a ridiculously high number. This would certainly be on the edge.
Maybe you could get a 276/282/108 In at 106, the Ica would be 64* and the pressure predicted to be 178/152VP there that is more sane.Overlap of 63* so it's getting closer to sounding like the 285 at idle.
>178/152 is about what I run and I have never wished for more
But how about lets go back up to the off-the-shelf 272/280/110 in at 106*this time for an Ica of 62* I get 182@158VP; oh yeah
Lets put it in your car with 4.30s
Your power peak will be near 5400 and a shift rpm of 6200, which will get you 45 in first, and a drop to 3660 into second and 65 will be 5300 badaboom there you go. The quickest way to 65
Or just a whole lotta tirespin.
