Originally posted by Stazi:
Originally posted by pole120:
Originally posted by Stazi:
Turbo is the only way you're gonna get anywhere near 300hp on a 2.5L



Mumm had damn near 300HP on his NA 2.5



It was a fully built race-motor. Somehow I don't think we can use that example here. Drivability of that thing on the street would be next to worthless.


You folks are comparing different numbers.

The racing engines (Mumm, Capaldi, etc) talked about use flywheel numbers without any accesories. (i.e. engine test stand dyno)

The numbers we normally quote here are "SAE wheel" power numbers. They are going to be at least 20% to 25% lower then a test stand run.

A 300 HP test stand run is maybe 240 wheels. The highest quote for a racing engine I have seen over the years was in the 330 "test stand" range. (~260 wheels) That's custom race cams, 13 to 1 CR, 120+ octane race fuel, etc. That is an extremely potent small displacement NA engine! (well over 100 hp/l at the wheels!)

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.