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Old 06-14-2014, 08:31 PM   #25
ksanders
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City: SEWARD ALASKA
Vessel Name: DOS PECES
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Quote:
Originally Posted by Capt.Bill11 View Post
Truck engines don't run a the same RPM hour after hour no matter the load on them. Plus they have a transmission attached to them. It's apples to oranges.

Light loading a Genset prime mover does cause glazing of the cylinder walls and other issue that shorten the time between rebuilds.

Now if the Genset is in a pleasure boat that is only used a couple of hundred hours a year, the difference that light loading can make in the times between rebuilds may not be of much concern.
Bill

You need to remember that a recreational marine generator has varying loads put to it. It will run at a very high output for periods of time, and then a lower output during other times.

The only actual cylinder glazing I've seen has been a very lightly loaded very old design genset that was powering a microwave site. That unit had a constant very low load. Certainly not what you see in a generator in a recreational boat.

And, as you indicated people in recreational boats will never see the long run times that we see in prime power applications, so engine size is for all practical purposes irrelevant to engine life in this application.
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