mikev

with all 4bbl upgrade on my 4.3 i am now turning 5200 rpms with a 3 blade ss prop pitch is 19. I was thinking of trying a 21' revolution 4 mercruiser says they are great for v6 boats. but I have heard that you need to be turning alot of horsepower to turn a 4 blade prop well. what do you guys think or hopefully some one has tried one of these props on a v6.

Ric232

Going from a 19P to a 21P 3-blade will cause you to drop to 4800rpm. Going to a Rev 4 21P will cause you to lose another 200-300. You may want to consider a 19P Rev 4.

mikev

according to mercury you can use the sme pitch it will not drop rpm's much.

Ric232

Yes, that's a rule of thumb. Experience specifically with the Rev 4 in most applications has yielded a 200-300 rpm drop with the same pitch. If you want to make sure you keep the same rpm's, try an Offshore (don't worry that Mercury says it's for outboards).

HOUSTONPROP

yep/Darin

Mr. Demeanor

I lost 300 rpm going from a 19 3 blade to a Rev4. But i picked up 2-3 mph