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Stationary Engines Discussion Forum

2-71 detroit and generator

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Bser

05-13-2007 10:11:05




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I recently got a 2-71 Jimmy that was in a michigan crane. It runs great and I'd like to use it to power a generator.I have a WW2 vintage jeep powered 12.5 kw unit that I thought of repowering.Any thoughts on this? We use detroits and stock parts so this wouldn't be an issue.




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buickanddeere

06-02-2007 22:20:02




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 Re: 2-71 detroit and generator in reply to Bser, 05-13-2007 10:11:05  
A 71 series Detroit runs fine with a six pole/1200rpm or four pole 1800rpm alternator. Using a belt drive on a generator is mickey mouse compared to direct drive. There is no way a 71 series will direct drive a two pole/3600 rpm alternator. Unless the 71 was built with heavy valve & cam follower spings. Engine life would be measured in hundreds of hours at best. Rather than the 10's of thousands of hours a 1200 rpm reefer 2-71 will operate. Check ebay for 2-71 reefer generators. There are units with deceased engines and intact alternators. The whole frame, rad etc is already there.

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jdemaris

05-16-2007 05:47:03




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 Re: 2-71 detroit and generator in reply to Bser, 05-13-2007 10:11:05  
The Detroit Diesel powered gensets typically run slower than anything else. Most generator heads are made for either 3600 RPM or 1800 RPM and cannot be run slower or faster since the Hertz cycle depends on proper RPM. The Detroit powered generators usually run at 1200 RPM - perhaps because that is the speed where they run the most efficient? Your Jeep genhead is probably setup for 1800 RPM operation (look at the ID tag).

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noncompos

05-13-2007 22:41:19




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 Re: 2-71 detroit and generator in reply to Bser, 05-13-2007 10:11:05  
Don"t really know if it applies to a 2cyl, but FWIW a manual I have for 3,4,6cyl single and multiple units has a table in the troubleshooting pages showing normal operating pressures at 1200, 1800 and 2000 rpm, but nothing higher, so trying to turn it up to 3000 or higher could be winding it up too tight...



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NC Wayne

05-13-2007 19:50:18




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 Re: 2-71 detroit and generator in reply to Bser, 05-13-2007 10:11:05  
I see the 2-71 power units listed online all the time running generators that size or slightly larger so I don't think there would be any problems related to the engine not having enough power. The only problem I could forsee would be that many gas engine driven generators are designed to turn at 3600 RPM and most diesels max out before that. I've dealt with alot of different Detroits over the years but none of the 2 cylinder variety so I don't know what their max RPM is or if that would be an issue or not. Other than that all I can say is good luck, it ought to be a fun project.

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Bob

05-14-2007 01:01:33




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 Re: 2-71 detroit and generator in reply to NC Wayne, 05-13-2007 19:50:18  
Surely a WWII Jeep powered unit would only turn 1800 RPM's, not 3600 RPM's?



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JD8020

05-30-2007 18:12:41




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 Re: 2-71 detroit and generator in reply to Bob, 05-14-2007 01:01:33  
My brother in-law has a WWII Jeep generator that runs at 3600. Scares the heck out of me. Sounds like it should blow at any second. Roger



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