what rpm is ok?
#12
My guess is a good prop to start with on your set up is a 23 pitch 3 blade. If you cannot get that prop to spin to around 5800 RPM then you have too much prop and need to back down to a 21 pitch. It is spins over 4800 RPM then you have an excess of power and will want to try a larger prop say a 25 pitch.
It is all trial and error based around matching the correct prop that puts your engine where it needs to be at WOT.
It is all trial and error based around matching the correct prop that puts your engine where it needs to be at WOT.
#13
Registered
Joined: Nov 2006
Posts: 974
Likes: 4
From: Boca Raton, FL
My guess is a good prop to start with on your set up is a 23 pitch 3 blade. If you cannot get that prop to spin to around 5800 RPM then you have too much prop and need to back down to a 21 pitch. It is spins over 4800 RPM then you have an excess of power and will want to try a larger prop say a 25 pitch.
It is all trial and error based around matching the correct prop that puts your engine where it needs to be at WOT.
It is all trial and error based around matching the correct prop that puts your engine where it needs to be at WOT.
If its the standard 7.4 litre 454 (not mag) then he should be running a max of 4800 RPM.
#16
Registered
Joined: Apr 2005
Posts: 2,957
Likes: 1
From: www.bajaboatowners.com
IMO you need to take that bravo 3 off there and put a bravo1 on there with 1.5 ratio. If you've already got a 1.5 ratio upper just buy a lower to put on it. Then put a 22p Bravo prop on it or a 23p Mirage Plus. I've got 2 bravo1 lower DWP on both




