Acme 668 or 422

[TRBenj]

Like I said before, I would expect the 422 and 224 to run nearly identical speed and RPM numbers.

If youre pulling the 668 5450rpm, then you will not want to make a big change... or you will end up against the 5600 limiter. 422 or 224 would probably get you pretty darn close to where you want to be. Id lean towards the 224 as well... because if it ends up running against the limiter, you can add a little more cup and not be in the "too much cup" range.

The 470 will turn 200rpm higher than the 422, so nearly 400rpm more than the 668. You may want to characterize your performance at the higher elevation before determining which prop to run there.

[jsta281]

Thanks for all your help. I think I will have some cup taken out of the 668 since it is cheap to do so.

[TRBenj]

I think I will have some cup taken out of the 668 since it is cheap to do so.

I think thats a smart move... try something in the .120-.130 range and see where it puts your WOT revs.

[perry386]

I have the 1268 on my 230 and its awesome other than I am getting prop burn on my hull.