Target compression ratio A/J
That frieburger test was done with a 260@050 tappet lift. Wouldn't that be about 305 or more advertised duration? The math on 305* makes a Dcr of 7.7 or something.
I understand that the test looks reasonable and fair, but
IMO that is not representative of the typical street build.
We need to get a test with a much more sane street cam, and a Dcr of about 9.0, and watch which heads burn what gas and at what timing.I think then things will dramatically change.
Or alternatively, pick a cam in the 220 to 230 range, and limit the timing to 35*, then adjust the Scr until they hit detonation on 89.Then calculate the Dcrs. Now that's a test I'd like to see.
If anything,;Frieburgers test is a testament to the aluminum heads not losing power when Dcr-limited to 7.7! Now, just try and drive that 7.7aluminum headed beast with normal street gears and a street stall TC.
As always, the dyno is a WOT snapshot of, what basically amounts to a race engine;not a street combo.
And for anyone who trys to run 110*F on a streeter, with a carb, well,let's just see how long, and how many miles, that engine lasts. You may need a separate 15hp small engine to power up the fan.
And in a racecar, just how are you gonna control that temp from waiting in the line to blasting off, run after run?
It's a nice number to know but IMO so what.
Anyway; that'd my opinion
