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John Deere Tractors Discussion Forum

Pony Motor RPM

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Joe Evans

02-05-2004 11:18:15

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I've read where most (maybe all) of JD's pony motors were of relatively high RPM--5400 I think I've seen. Why did JD spin these up so high when 3600 RPM is what you commonly see on a small engine. Why did JD choose a V-4 arrangement on these motors?

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Bo in Maryland

02-05-2004 19:09:43

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Re: Pony Motor RPM in reply to Joe Evans, 02-05-2004 11:18:15

..... .Joe, the idle speed for a 730D is 4000 rpm at slow idle and an insane 5000rpm at fast idle..... the first time I ever took one up to fast idle it startled me because I thought sure the engine would blow.....

"I am forever curious why manufacturers do what they do such as why JD changed to 4 cylinders or why IHC stuck with the god-forsaken fast hitch."

..... I've read that JD went to 4 cyl. because they were in an extremely tough fight for market share with all their competitors as the overall tractor market began to contract....they had to have more power and felt they had gone as far as they could go with 2 cylinders.

Good luck to everyone!
Bo

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Clooney

02-05-2004 12:47:39

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Re: Pony Motor RPM in reply to Joe Evans, 02-05-2004 11:18:15

Joe, those small pony engines were spun fast for a couple of reasons. The first was due their short stroke & small piston size that RPM was needed to get enough power out of them to spin over the diesel engine.. The second kind or relates to the first, due to the gear reduction needed to get that small engine to spin the bigger one fast enough to start in all weather conditions that higher RPM was needed..

~On the V-4 design??.. The originals on the R were opposed 2 cylinder pony's.. Due to the narrower hoods on the later tractors the V-4 design was needed to fit under the hood & still have enough power to crank the diesel..

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Joe Evans

02-05-2004 13:46:05

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Re: Re: Pony Motor RPM in reply to Clooney , 02-05-2004 12:47:39

Thanks for the answer. I am forever curious why manufacturers do what they do such as why JD changed to 4 cylinders or why IHC stuck with the god-forsaken fast hitch.

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Mike M

02-06-2004 09:38:45

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Re: Re: Re: Pony Motor RPM in reply to Joe Evans, 02-05-2004 13:46:05

Someone please enlighten me on why a fast hitch is so bad ? Godforsaken ?? I cuss a lot worse than that at a 3pt. when trying to pull both those arms out to the side to line up to the pins
then have to slide ,bang or kick to get the balls over the arms cause the angle changes as you push on farther,but it does help if your hitch is about wore out so you have some extra play.

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