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2-cly--rpms

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bill

02-25-2003 16:44:10




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on my 50 JD A that is all stock, we could use a little more zip on belt for certain things, how far safley can I push rpms thanks




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G Taylor

02-27-2003 08:51:35




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 Re: 2-cly--rpms in reply to bill, 02-25-2003 16:44:10  
Centrifical and recipricating loads increase with the square of rpm. Double the speed and have four times the stress. Triple the speed and have nine times the stress. The small long ports on two cylinders were intended to produce veleocity/inertia to fill the cylinders full when lugged to 800-900rpm. Turbulance was designed in to keep the air-fuel mixture mixed in the ports and combustion chambers. High revs above full rated actually drop HP as the cylinders are being filled less and less per stroke past peak torque rpm. When max total airflow through the engine is reached so is peak HP. Reving past peak HP just makes noise and reduces part life.

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Will P

02-26-2003 14:24:33




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 Re: 2-cly--rpms in reply to bill, 02-25-2003 16:44:10  
I also agree with the other posts. I run a thresher and a corn husker shredder by belt. Need alittle more power on the belt. So I got a G. I thing it may be time for bigger power for you. Good luck.

Will P



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G-MAN

02-26-2003 07:48:37




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 Re: 2-cly--rpms in reply to bill, 02-25-2003 16:44:10  
I agree with the posts below. If everything is okay with the carb and governor, turning up the no-load speed isn't going to give you more power at the belt, other than a little more momentum to use up before the engine pulls down. If the governor is opening the carb fully at full-load RPM now, you won't gain any horsepower at full-load by turning up the high-idle speed (the maximum no-load speed of the engine). The governor only has to open the throttle plate a fraction of it's total travel range to make the engine run at full speed with no load. You need to make sure everything is performing correctly as the engine comes under load.

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Lee

02-25-2003 21:56:54




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 Re: 2-cly--rpms in reply to bill, 02-25-2003 16:44:10  
Probably %10 would be the safe limit, any more and you might run into trouble if the say the belt broke or for some other reason the engine could take off with no load. A lot depends on how tightly your governor can keep the engine at at the desired RPM. Do you even have a method to determine current RPM? And then the same under load? Start there first.



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Village Blacksmith

02-25-2003 19:32:03




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 Re: 2-cly--rpms in reply to bill, 02-25-2003 16:44:10  
Your "A" should run exactly 1080 RPM at maximum throttle without load. Loaded to normal load, it will run about 975 RPM. Don't do anything to increase the RPM. Work on the governor angle that is suggested by others.



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Chris

02-25-2003 19:07:11




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 Re: 2-cly--rpms in reply to bill, 02-25-2003 16:44:10  
I dont know the exact "limit" but maybe i can make another suggestion. Check your governor linkage adjustment. The book says 1/2 hole short. Set it 1 hole short and it will make that governor do tricks My 60 Goveror WAS WAAAAA Y off it wasnt the same tractor when i properly adjusted it. Thanks Chris



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AlbertoV05

02-25-2003 18:07:55




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 Re: 2-cly--rpms in reply to bill, 02-25-2003 16:44:10  
Bill,
I can't help you with an A, but the "red-line" on my 1955 Model 60 is 1150 rpm (per manual).

Al in Iowa



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