need help, 27 fever top end speed.
#1
Registered
Thread Starter
need help, 27 fever top end speed.
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.
#3
Registered
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.
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.
#4
Registered
Thread Starter
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.
#6
Registered
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.
#7
Registered User
Join Date: Feb 2001
Location: Tampa, Indian Shores Beach
Posts: 3,300
Likes: 0
Received 1 Like
on
1 Post
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
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
#8
Registered
Thread Starter
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).