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Old 01-30-2018, 12:18 PM   #41
Tom.B's Avatar
City: Cary, NC
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,799
Hi Bob,

I would give you the best advice I can give... Don't overthink it. Find a boat you like and take care of it. It will last you a long time. Trying to base your choice on a brand decision or a low/high rpm will have you still shopping 10 years from now. I am sure we can all state examples of every scenario of engine life, but the reality is that there are no rules that govern engine longevity. Please don't drive yourself crazy trying to prove the impossible because there is more to a boat than just the engine. And besides, by your description of future use, it will take you many, many decades to come anywhere near the point-of-failure you are trying to predict.

Go find yourself a well cared for boat that fits your lifestyle. Period. You will be a lot happier!

Good luck.

2000 Navigator 4200 Classic
(NOT a trawler)
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Old 01-31-2018, 12:33 AM   #42
Lepke's Avatar
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,334
Light duty/recreational engines are not made to run at rated hp continuously. Usually 3-500 rpm less. If you look up the ratings, it's usually 2 hours in 12 can be run at full hp.
Any engine, properly maintained and used sparingly will last longer. Sometimes decades longer. The lifespan killer is high exhaust gas temperatures and dirty oil. Engines run wot have high EGTs. Those extreme temps eat away at the metal parts in the cylinders - cylinder walls, rings,pistons and valves. Slow down and let your engine live.

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diesels, high rpm, light duty, reliable engines

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