Baja 240 rpm question
06-07-2010 | 03:58 PM
#1
Thread Starter
Registered
Joined: Jun 2010
Posts: 54
Likes: 0
Baja 240 rpm question
I just bought a 88 baja 240 sport, with a 454 mag. I am running a 4 blade prop, not sure the pitch but im sure its around the correct pitch for the boat (22-25) The boat runs 4100 rpm @ WOT. can't quite get to 60 mph. Does this sound normal for this boat?
06-07-2010 | 06:05 PM
#3
Registered
Joined: Sep 2008
Posts: 916
Likes: 41
From: Tampa Bay Area Florida/ North Miami Florida
There is now way that boat will do 74 mph with a 454 mag. I think 64 would even be a stretch.. On GPS that is.. I do agree you need to be turning more RPM. With a smaller pitch prop you will come out of the hole better and prob pick 4-5 mphh on top.. Those boats like 3 blades for speed and 4 blades for Skiing or tubing.
Chris
Chris
No,,,a 454 Mag needs to run at
5200-5400 RPM so i think your prop is to big or something else is wrong..timing maybe or so.
A buddy had 1 just like it with a 454 mag and a 23 mirage ( 3 blade ), boat ran right at 74 MPH !!!!!
So with a 4 blade it should be a 21-22 pitch prop !
5200-5400 RPM so i think your prop is to big or something else is wrong..timing maybe or so.
A buddy had 1 just like it with a 454 mag and a 23 mirage ( 3 blade ), boat ran right at 74 MPH !!!!!
So with a 4 blade it should be a 21-22 pitch prop !
06-07-2010 | 06:28 PM
#5
Registered
Joined: Oct 2005
Posts: 1,899
Likes: 20
From: Millstadt, IL
He does that all the time. He is just trying to stir things up.
You should prop the boat for about 5000 RPM. A Mag engine has forged internals, you can run a mag engine higher in the RPM range if it does not have a limiter. The cam is not designed to build power after about 5000 RPM, you will most likly not go any faster. A 3 blade 23p mirage prop should work the best for speed. You should see about 61 or 62 on a GPS. If you do not see these sort of numbers try checking the timing, replace wires, plugs, cap ect...
You should prop the boat for about 5000 RPM. A Mag engine has forged internals, you can run a mag engine higher in the RPM range if it does not have a limiter. The cam is not designed to build power after about 5000 RPM, you will most likly not go any faster. A 3 blade 23p mirage prop should work the best for speed. You should see about 61 or 62 on a GPS. If you do not see these sort of numbers try checking the timing, replace wires, plugs, cap ect...
06-07-2010 | 06:55 PM
#6
Registered
Joined: Dec 2000
Posts: 6,283
Likes: 1
From: EASTON MA.
when my baja 24 was new in 88 it had a 454 330hp and did 62 on speedo, a friends had a 454 mag365hp did 64 speedo, I also moved up to a merc 502 in 93 390hp was getting 67 on speedo. props were mirage 23 non plus, for the 454s and 25 for the 502. the drives are deep on these boats so up grading to a imco 2'' shortie gives better handling and speed but you need a 1990 b1 drive or newer the 88 drives had a smaller case and different inside.
06-07-2010 | 07:29 PM
#8
Registered
Joined: Dec 2007
Posts: 710
Likes: 4
He does that all the time. He is just trying to stir things up.
You should prop the boat for about 5000 RPM. A Mag engine has forged internals, you can run a mag engine higher in the RPM range if it does not have a limiter. The cam is not designed to build power after about 5000 RPM, you will most likly not go any faster. A 3 blade 23p mirage prop should work the best for speed. You should see about 61 or 62 on a GPS. If you do not see these sort of numbers try checking the timing, replace wires, plugs, cap ect...
You should prop the boat for about 5000 RPM. A Mag engine has forged internals, you can run a mag engine higher in the RPM range if it does not have a limiter. The cam is not designed to build power after about 5000 RPM, you will most likly not go any faster. A 3 blade 23p mirage prop should work the best for speed. You should see about 61 or 62 on a GPS. If you do not see these sort of numbers try checking the timing, replace wires, plugs, cap ect...
