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Old 09-14-2021, 10:52 AM   #1
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Cummins Idle time

How is it that the Cummins manual cautions about excess idle time on our diesel pushers, but our Cummins diesel generators run forever at idle?
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Old 09-14-2021, 10:58 AM   #2
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The generator probably doesn't have an EGR valve or diesel particulate filter.
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Old 09-14-2021, 11:02 AM   #3
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Quote:
Originally Posted by move on View Post
The generator probably doesn't have an EGR valve or diesel particulate filter.
Yep! First answer hits the bull’s eye.
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Old 09-14-2021, 11:02 AM   #4
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My 10kw diesel generator is always turning 1800 rpm.

How low do the 8kw generators go? I would suspect it is always turning at least 1000 rpm.
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Old 09-14-2021, 11:37 AM   #5
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Most AC generators will turn at synchronous speed, i.e., some multiple of the AC frequency divided by the number of pole pairs in the windings. A 2 pole 60 hertz (cycles per second) generator will turn at 3600 RPM, a 4 pole at 1800 RPM, etc. Slower is always better, but it costs more.
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Old 09-14-2021, 07:08 PM   #6
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No dpf and it never idles
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Old 09-14-2021, 07:26 PM   #7
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No dpf and it never idles
Exactly ; just because it appears to be a constant RPM ( until the load increases) , that is not idle speed ; it's coolant capacity is in quarts not gallons , and the engine weight is in pounds , not tons .
The engine gets to temp quickly and stays there.
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