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Old 04-02-2019, 02:39 PM   #3
Ski in NC
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City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,099
The 4-71 at 300 is very similar to 6-71 at 450, which is much more common. Not a bad engine, but as above does not live long if run hard. If run at trawler speed, they can live dang near forever.

These are turbocharged and intercooled.

Fuel burn is a little worse than modern four strokes. A four stroke might make 19hp per each gph burned, these will be in the 16-17 range. Not horribly worse.

Parts are available for these. Fairly easy to assess, either do a airbox inspection or a compression check.

Second that about noise, both in engine room and out the exhaust. Hard to muffle these well and that can cause an annoying drone anywhere near the back of the boat.
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