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Old 08-16-2017, 11:56 PM   #1
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I recently purchased my 3700 SCR w/twin 454 MPI (310hp Each)
I am at Lake mead about 1100 ft elevation and I can only get 4000 RPM and WOT 23mph.
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Old 08-17-2017, 01:36 PM   #2
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[Moved from an old Thread discussing fuel consumption to a dedicated thread.]

Welcome aboard Fastbri!!

I assume this is inboards? The 454 should be able to reach between 4400-4800 rpm under load. The MPI should account of the elevation, unlike a carb which would need to be rejetted.

This would typically indicate either being overpropped, overloaded, or suffering the results of growth on the hull and running gear.
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Old 08-17-2017, 06:14 PM   #3
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I suspect gear ratio or props as well. Boat only has 167 hours on each motor. Normally just two/four on board.
What prop do you run? I think this is 24' and bottom is clean
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Old 08-18-2017, 12:44 PM   #4
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Do you have inboards or IO's?
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Old 08-18-2017, 04:00 PM   #5
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Quote:
Originally Posted by shrew View Post
Do you have inboards or IO's?
I believe inboards was the only power set up for the 3500 and up Maxums and the small cruisers were all I/O based. One cannot compare prop sizes between inboards and I/Os.
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