Re: V8 powered F12 Farmall

Posted by Tony on September 25, 2001 at 06:37:18 from (199.48.24.11):

In Reply to: V8 powered F12 Farmall posted by Scott on September 24, 2001 at 19:34:27:

I've got at thought for you. The rpm potential of the V8 is obviously going to be a bit of a problem for you. Not because the tractor will self destruct if the motor spins fast but because accidentally applying full throttle is going to get you a tractor that is suddenly going 20 mph in your back yard with you being bounced off the seat. Not particularly safe. Top speed could be on the order of 60-70 mph.

Anyway, there is no real reason why the rpm has to be a real problem. I would suggest installing a throttle stop so that the throttle is limited. With a little modification, I cant see a reason why you couldnt get a V8 to run well at speeds as low as 200 rpm or so. since the V8 is way more efficient than the original, horsepower at low rpm wont be a problem. hunt around and find the smallest carb that you can possibly fit on the V8 intake manifold (like the single barrel version that probably came on a crappy station wagon or other low performance application). Smaller is better for low rpm. That should provide you a decent, stable fuel supply at really low engine rpm (which means really low air flow rate through the engine). You should probably adjust the ignition timing for lower rpm. You can also retime the cam for lower rpm operation. I think that the cam needs to be advanced so that it has more low end torque (which really means that it is more efficient at low rpm). Since you have access to machine tools, you could also make a big disc that you could attach to the flywheel so that it has more mass. IF YOU DO THIS, MAKE SURE THAT YOU DO SOMETHING TO ENSURE THAT THE RPM NEVER GETS VERY HIGH. A HOMEBREWED FLYWHEEL IS SURE TO EXPLODE AT HIGH RPM BUT SHOULD BE OK AT LOWER SPEEDS.

None of those mods should cost much money. The shims for the cam are only about $10 or so. The carb should be next to free if you can find one because nobody will want the thing. Disc for the flywheel should be free to you because of the machine shop.

Good luck and happy tractoring.

Tony

Follow Ups:

• Re: Re: V8 powered F12 Farmall MikeH-Tx 07:17:55 09/25/01 (0)

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