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Old 10-18-2018, 10:30 PM   #21
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Somewhere, sometime, a very smart marine engineer said props move boats. So unless you change props where does the increased speed come from as you increase boost pressure?
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Old 10-19-2018, 02:39 AM   #22
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Fuel settings determine hp. Not boost. Only way you're going to pickup how is if the old turbo was not sized properly and the engine was not making the proper amount of boost.
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Old 10-19-2018, 07:45 AM   #23
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Originally Posted by BIG CAT View Post
Fuel settings determine hp. Not boost. Only way you're going to pickup how is if the old turbo was not sized properly and the engine was not making the proper amount of boost.
1 turn on the cav pump wont hurt anything.
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Old 10-19-2018, 08:26 AM   #24
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Do you have trim tabs? Maybe a correctly sized set might get you up on plane. A check with other Mainship owners might find out.
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Old 10-19-2018, 09:12 AM   #25
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[QUOTE=Mrwesson;707767]1 turn on the cav pump wont hurt anything.[/QUOTE

No matter how you increase horsepower in that specific engine the boat speed at a given RPM will not change one iota unless you re-prop.
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Old 10-19-2018, 09:31 AM   #26
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The crank on the turbocharged versions are specially hardened to take the thrust 'cintrided'. and built to do the job assuming there's no excessive bushing wear.
In fact the 6354 and the 4236 share pistons, rings, push rods and cylinders even though for the some strange reason the part numbers are different, just the block is longer with 6 cylinders
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