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Tractor Talk Discussion Forum

OT - Jimmy Engine

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Pete

02-08-2004 08:26:33




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I heard my neighbor talking about the new gen set he picked up at the auction. He said it has a Jimmy Diesel Engine. Is that a real engine name or is it another name for a Detroit or Cummings. Why is it called this.
Thanks, Pete




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Pete

02-08-2004 14:42:27




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 Re: OT - Jimmy Engine in reply to Pete, 02-08-2004 08:26:33  
Thanks all. The G was a typo.



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buck

02-08-2004 13:24:07




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 Re: OT - Jimmy Engine in reply to Pete, 02-08-2004 08:26:33  

V6 Jimmy diesel crate motor painted blue if I remember correcty. By the mid 60's had a wide range of uses commercial, military and OTR trucks, Very well known for commercial buss applications May still be used today but I been out of the loop a long time. If I remember correct the military 25KW generator used the jimmy in the 60's



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Bob

02-08-2004 12:14:19




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 Re: OT - Jimmy Engine in reply to Pete, 02-08-2004 08:26:33  
People also call the GMC version of the Chevy Blazer "Jimmy".



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Bob

02-08-2004 12:15:54




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 Re: Re: OT - Jimmy Engine in reply to Bob, 02-08-2004 12:14:19  
P.S....

The word CUMMINS, when referring to engines, does not have a "g" in it.



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Thanks Bob

02-08-2004 13:14:32




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 Re: Re: Re: OT - Jimmy Engine in reply to Bob, 02-08-2004 12:15:54  
Yeah there is NO "G" in CUMMINS :)



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TomF

02-08-2004 12:12:59




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 Re: OT - Jimmy Engine in reply to Pete, 02-08-2004 08:26:33  
Before the Detroit Diesel name was adopted, these engines were known as GM Diesel--Hence the nickname "Jimmy". Don't know the precise date when the name change was made. Just guessing sometime in the '70s.



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Paul Janke

02-08-2004 09:24:20




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 Re: OT - Jimmy Engine in reply to Pete, 02-08-2004 08:26:33  
If I'm wrong, somebody will tell us, but I thought it is because Detroit is or was a branch of GM, thus GMC or Jimmy.



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Jimmy King

02-08-2004 11:19:23




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 Re: Re: OT - Jimmy Engine in reply to Paul Janke, 02-08-2004 09:24:20  
I think you are right on Paul the old GMC road tractors used them thus GMies.



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TimV

02-08-2004 08:45:32




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 Re: OT - Jimmy Engine in reply to Pete, 02-08-2004 08:26:33  
Pete: "Jimmy Diesel" is usually used in reference to the older 2-stroke Detroit Diesels, such as the 71-series. I don't know where the term originated, but that's the usual nickname for these engines.



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rustyfarmall

02-08-2004 10:15:31




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 Re: Re: OT - Jimmy Engine in reply to TimV, 02-08-2004 08:45:32  
They were originally used only in G.M.C., or Jimmy, trucks. The engine manufacturer was, and maybe still is, a division of the General Motors Corporation.



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buickanddeere

02-08-2004 21:01:55




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 Re: Re: Re: OT - Jimmy Engine in reply to rustyfarmall, 02-08-2004 10:15:31  
GM diesel was dropped in favor of Detroit Diesel so they could sell the Jimmy in Ford trucks.



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jd730

02-08-2004 11:54:53




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 Re: Re: Re: OT - Jimmy Engine in reply to rustyfarmall, 02-08-2004 10:15:31  
I think Penske bought the Detroit Diesel line from GM and they may have sold it agian, not sure on that. Bill



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Bob

02-08-2004 17:52:53




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 Re: Re: Re: Re: OT - Jimmy Engine in reply to jd730, 02-08-2004 11:54:53  
Yep,

Detroit Diesel was sold again. In 2000, I believe, to Daimler Chrysler!



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JD dozer mike

02-08-2004 13:12:32




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 Re: Re: Re: Re: OT - Jimmy Engine in reply to jd730, 02-08-2004 11:54:53  
hmm. yeah, they are now Detroit / Allison. Also if you ever hear the term "screamin jimmy" it is because the old 2 cycle detroits had a much higher RPM (1800-2600 rpm) than the other diesel engines of their time , and they sound like they are "screaming".



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Dsl

02-08-2004 13:54:58




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 Re: Re: Re: Re: Re: OT - Jimmy Engine in reply to JD dozer mike, 02-08-2004 13:12:32  
And also because of the blower for scavenging the two stroke engine; they move a LOT of air, and add greatly to the 'screaming'(actually more like 'howling') sound. The two stroke cycle itself makes the engine sound like it's running twice as fast as a four stroke because there's a combustion stroke for every revolution of every cylinder, verses one combustion stroke for every SECOND revolution of every cylinder in a four stoke.

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Jon H

02-08-2004 13:51:11




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 Re: Re: Re: Re: Re: OT - Jimmy Engine in reply to JD dozer mike, 02-08-2004 13:12:32  
A Detroit 2 cycle fires twice as many cylinders per per revolution as a comparable 4 cycle engine,so they sound as if they have twice as many cylinders or run twice as fast. Between the mechanical scream of the roots type blower and the fact that they fire every cylinder every revolution,they truly are a screaming Jimmy. I once sold a tractor powered by a 6-71 Detroit to an old fellow who had run nothing but a D4 cat before. He was used to a 4 cycle,4 cylinder cat at 1100 rpm making it's slow chukata chukata exhaust noise. I got the old fellow up into the cab,and when he advanced the throttle from 500 rpm idle to around 1000 rpm, the Detriot let out a normal brrrroooowwwww noise. The old guy instantly stiffened up and yanked the throttle back to idle. His wide eyed question to me was "why does that engine run so fast ?" I had to convince him that the engine wasn't really running fast,but sounded that way becuse it was a 6 cyl 2 cycle engine. Even had to get him down to the front of the engine so he could see that the front pully was turning so slow you could almost count revolutions while the exhaust was making the Brrrrr rrrrr rrr sound. He ran the tractor for years,but I don't know if he could ever bring himself to run that engine at the 1900 rpm it needed to pull and stand up. His tillage tools were much too small for this 240 hp four wd tractor,so lugging it a bit may not have hurt it.

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