Yep, when I calculated the 100% VE power for that combo @ 7,300rpm,SpeierRacingHeads wrote: ↑Sat Nov 23, 2019 12:25 pmYES, totally agree. Using my Leverton spreadsheet, it was using all of the cross section and flow to make that power at 7300 rpm based on 146 cfm sq/in.CamKing wrote: ↑Sat Nov 23, 2019 11:20 amCalculating the efficiency of the output from engine #1, I would say you're right at the limit of that port. It can make more power with a larger cam, and more RPM, but it won't be as efficient.SpeierRacingHeads wrote: ↑Fri Nov 22, 2019 12:57 pm Thought some might find this interesting. Maybe a discussion with some dyno results. This might not be a perfect A/B test, but the heads were the same and the components.
Basic engine:
4.165 x 3.48
Both LW Scat cranks
Both Mahle pistons
Both 6.000 rods
Same oil pans
Engine 1:
Whitener 1000hp 4150 VP113 fuel
13.50 compression
Vacuum pump w/11.2"
260/268 Solid Roller
.680 at retainers
106 LSA 102 ICL
677@7300 --- 545@5400
I came up with 683hp, and 552ft/lbs.