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Volvo Penta Engine issues
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Author:  Kennepp [ Sun Jul 22, 2012 10:52 pm ]
Post subject:  Volvo Penta Engine issues
I have a 2005 Funship 234 with a 5.7 Gi/DP 280 hp engine. I bought it with 50 hours on the motor and when I first took it out, at 30 mph it started to jump. I would back it down and it stopped. The dealer said it was the computer and switched it out with another he had. It works now but I can't get over 40 m.p.h because the rpm's are at 5500 and I am scared to go any higher. Any suggestions of what might be wrong?
Author:  ric [ Mon Jul 23, 2012 7:12 am ]
Post subject:  Re: Volvo Penta Engine issues
Kennepp wrote:
I have a 2005 Funship 234 with a 5.7 Gi/DP 280 hp engine. I bought it with 50 hours on the motor and when I first took it out, at 30 mph it started to jump. I would back it down and it stopped. The dealer said it was the computer and switched it out with another he had. It works now but I can't get over 40 m.p.h because the rpm's are at 5500 and I am scared to go any higher. Any suggestions of what might be wrong?


What prop is on the boat? Sounds like someone put something too small a pitch on there
Author:  Kennepp [ Fri Jul 27, 2012 11:12 pm ]
Post subject:  Re: Volvo Penta Engine issues
It is the correct prop. F5 on both. THey are the factory props.
Author:  Aussie_Horizon_190 [ Sun Jul 29, 2012 7:51 pm ]
Post subject:  Re: Volvo Penta Engine issues
Are you measuring the speed with the speedo (notoriously inaccurate) or a GPS?

If it has F5's and doing 5500 rpm and only 40mph by the GPS, then all that's left is either excessive drag from somewhere (maybe a dumba$$ question on my part, but have you tried trimming up a bit?) or the leg ratio may be wrong? Only other thing I can think of is the props may have been badly repaired at some time.
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