Not all marine diesels have wastegate's, especially the older and non Jap stuff.
If you load one of these non wastegated engines up there's every chance the boost will run sky high.
I wonder if this boat got a new prop at the same time of the engine rebuild (on one motor)
If it's making 40 psi of boost, it's certainly trying hard. So there's plenty of oxygen getting in, and to produce all that oxygen (read boost) there must be plenty of exhaust gas, which means there must be plenty of fuel.
Over-propped me thinks. (or wrong impellor if it's a jet)
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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