need help, 27 fever top end speed.

[cig92]

hello, my friend J.C. has a 1994 27 fever with a 500 efi and a 2'' sm shorty. the best that we've seen on top end is 66.2 mph. he went from a standard bravo to a 3" shorty but had to put an inch spacer in it. still very hard to get on plane. currently running a 24 4 blade bravo at 5000-5100 rpms. what can i expect from this strait bottom boat and what set ups are you running? this seems a little slow to me, any help would be great, thanks in advance.

[apppedigree]

Not enough power for shortie drive IMO. Usually you go 5 blade with the shortie drive.

[badluck]

The prop slip is around 11% which seems fine.
How many hrs on the motor?
The boat should run abround 70mph with HP500.
I get 71mph @ 5300rpm out of my -93 with a carb HP500 and 14 1/5 24 4 blade March.

[cig92]

the boat is new to him but previous owner says the motor was put together last year. the owner never gave specifics on the motor, just stated that it was a fresh 500 efi. just by looking at the motor it looks like it may have started life as a 502 efi 415 and some one put a 500 efi unit and a nasty cam in it. with the standard length bravo we were only seeing 45 4600 rpms. with the shorty it's around 5100 now. 70's would be nice.

[fast fun 2]

TRy a Hydramotive prop. We have good luck with those on 27s.

[mcprodesign]

Originally Posted by cig92

hello, my friend J.C. has a 1994 27 fever with a 500 efi and a 2'' sm shorty. the best that we've seen on top end is 66.2 mph. he went from a standard bravo to a 3" shorty but had to put an inch spacer in it. still very hard to get on plane. currently running a 24 4 blade bravo at 5000-5100 rpms. what can i expect from this strait bottom boat and what set ups are you running? this seems a little slow to me, any help would be great, thanks in advance.

A labbbed 26 Bravo might be what you need.. Talk to BBLades...They are just heavy old hulls ,,But they are nice in the chop.

[BAJA WILL]

Sounds like your #'s are right for a 415hp 502mpi.

Here are some basice #'s for a 27 w/ 500efi, 17.5" X-DIM 25 Hydro, should put you at 72-74mph 5300rpms

Sounds to me you need tho get rpms up!

WILL

[cig92]

thanks for the help guys. yes, i did try a hydro 24 with out a diffuser ring and had a hard time getting on plane only improved 1 mph 67.4. also went with a 25 3 and couldn't get it on plane, (5000 rpm).

[chief fever]

Cig,have Brett at Bblades send you a Merc. Maximus 5 blade to try,They have worked very well on my 29 Fever,Just my 2 cents!!!

[fountainfevr]

I have 23 hydro gettin 67 on river 73 on the lake.at 5300
502 MPI