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Gas to diesel engine rpm's difference on a change over?

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Curious

12-05-2001 12:35:48




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Have been following the posts about engine swaps with interest, but have a question. When changing out a gasser for a diesel, how do you compensate for the engine rpm's difference in order to maintain the same tractor performance?




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larry wolfe,

12-05-2001 14:40:06




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 Re: Gas to diesel engine rpm's difference on a change over? in reply to Curious, 12-05-2001 12:35:48  
On oliver tractors the gas and diesel engines turned the same rpm's.



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Shep

12-05-2001 12:51:46




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 Re: Gas to diesel engine rpm's difference on a change over? in reply to Curious, 12-05-2001 12:35:48  
That is an interesting question. Most of the Oliver Cummins conversions that happen are diesel to diesel conversions that both have approximatly the same rev band and therefore that is not a problem. However if you were switching from a gas tractor that did not turn the 2500 RPM's that the Cummins would, you would have a problem. For example I have an M-5 Moline that tachs 540 at a mear 1366 RPM's, finding a diesel that could pull 540 at that RPM would be hard because it is too far down in the power curve. In short you would try to find a replacement engine with the same RPM range that the old one had.

A friend of mine had some kind of a 4 cyl diesel engine in a gas 1655 once that would turn 3400 RPM's. The Cummins 5.9L engine is about 3 inches shorter than most of the Oliver engines and the 4 cyl is much shorter, so he moved the engine foward and had put some kind of speed reducer transmission between the chain couplers where the three speed hooked on the transmission. It was pretty wild looking, and man the fan would roar at full throddle but it worked and he had tons of power and tork in that thing. So you can do anything if you put your mind to it.....

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Mike M (WA)

12-06-2001 08:30:48




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 Re: Re: Gas to diesel engine rpm's difference on a change over? in reply to Shep, 12-05-2001 12:51:46  
This was a problem with engine changeovers in the old Cats, too. I had a Cat 35 (forerunner of the D-7) that had a mid-'40's vintage White gas truck engine. They left the truck transmission on behind the engine, and you ran the truck tranny in 1st gear to get the RPM's down to the right range to input to the Cat transmission. "Compound reverse" was fun- put both in reverse, and the machine moved forward- at a snail's pace. I also heard of some guys putting automatic transmissions ahead of the crawler tranny, and you could shuttle between low and reverse without the clutch, "just like the new ones" (well, sorta. . .)

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