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Tractor Pulling Discussion Forum

m prm

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joe

01-01-2004 06:55:32




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what is a safe rpm for a stock stroke m. I am running 1950 right now cant get anymore with the spring I have




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john d

01-02-2004 19:08:45




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 Re: m prm in reply to joe, 01-01-2004 06:55:32  
I'm not a puller, but we farmed with a '49 M for years that was set at 2100 rpm. We turned it up in '65 or so, and quit farming with it in '88. I've still got it. If it was gonna hurt it, it should have by now!



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Wild Horses

01-02-2004 10:36:17




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 Re: m prm in reply to joe, 01-01-2004 06:55:32  
We've run our M's as wide as the spring will let you and had no problem. Use a piece of wire and try 3-4 rounds of the spring together, it'll give you the same effect as a stiffer spring. During a slow night last year, we replaced the spring in one M with a solid bar (bypassing the governor effects). Tach said 3 grand, when he chickened out. It screws up your hand thottle movement though.



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buickanddeere

01-01-2004 20:59:21




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 Re: m prm in reply to joe, 01-01-2004 06:55:32  
Remeber stress goes up with a square of rpm. Double the rpms and loads are 4 times. Triple rpm and stress is nine times.



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Chad

01-01-2004 18:12:10




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 Re: m prm in reply to joe, 01-01-2004 06:55:32  
I run 2100 rpms on a stock super m with no problems for the past 2 years of pulling. I just watch the load on the engine-if the sled is pulling light I don't open it up all the way until it is under a good load. No need to rev it empty.

Like Hpuller2001 said just get a stiffer spring from a hardware store and you are good to go.



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Hpuller2001

01-01-2004 07:28:38




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 Re: m prm in reply to joe, 01-01-2004 06:55:32  
When turning up the rpm's on a tractor,, just be careful.. if it has never been apart in a while,, bolts tend to loosen up a bit,, use caution.. I would say in the area of 2150, for a stock, unaltered engine,, may be pushing it,, just take your time, don't push the limits. I know it sounds kinda strange,, only 200rpms more... but flywheels can come apart!! Just got to the hard ware store and get a stiffer spring. When buliding governors,, the governor needs to be able to go past the rpm range, and then back it down to the rpm range you need. It will speed up throttle responce and will improve the lug power in the engine. If you need a spring,, I have a few.. Hpuller2001

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