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1939 A JOHN DEERE

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SCOTT LUNA

11-12-2002 07:25:20




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I HAVE A 39 A ALLFUEL BUT I RUN IT MAINLY ON GAS WOULD IT BE TO MY ADVANTAGE TO REPLACE THE ALL FUEL PISTONS WITH ALUMINUM GAS PISTONS IF I AM GOING TO PULL IT.PLEASE GIVE ME SOME TIPS ON HOW I CAN GET MORE POWER CHEAP.




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my 2 cents

11-12-2002 16:41:46




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 Re: 1939 A JOHN DEERE in reply to SCOTT LUNA, 11-12-2002 07:25:20  
If you are looking for power on a budget don't waste your time on expensive fuel for your A. High octane gas won't do any good unless you have a detonation problem already from a load of compression. I have seen back to back dyno runs testing pump gas vs race gas on a mild G, there was no difference that I could see on the dyno. The same goes for removing the oil cup on the oil bath...no gain. Real power comes from common sence improvements like the ones outlined by G-MAN. Ad some compression, increase its breathing and give it good spark.

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Antique Puller

11-12-2002 08:17:09




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 Re: 1939 A JOHN DEERE in reply to SCOTT LUNA, 11-12-2002 07:25:20  
After you took care of the obvious, instead of buying your gasoline at the Qiuck Trip, go to your local airport and buy 100LL. This is 100 octane avgas, and will run well while pulling. My "G" likes it. It is dry, so you should add a little Marvel Mystery Oil or something similar.



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G-MAN

11-12-2002 07:46:40




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 Re: 1939 A JOHN DEERE in reply to SCOTT LUNA, 11-12-2002 07:25:20  
If you're going to run it on gas exclusively, and are interested in pulling it, going to higher compression aluminum pistons will gain you power. You could also shave the head and/or while it's off to gain some more compression, as well as open up the ports and gasket match the head and intake. If it's still got an all-fuel manifold on it, you could probably install a gasoline manifold to pick up some more power also. I don't know what manifolds fit what heads on "A"s, so you may have to do some research into that. Other ideas would be electronic ignition. Some say it doesn't improve power over a good point set-up, but it definitely improves starting and response, plus you'll want a little more fire due to the increased compression. You could also install a gasoline "A" carb while you're at it, which will be calibrated to perform better on gasoline than you're all-fuel carb. You could also consider a reground camshaft, and definitely invest in a good valve job while the head is off. Those are a few of the things you can do without breaking the bank, because when you get into stroked cranks, reworked rods and such, the dollars add up in a hurry. I'm not a JD two-cylinder performance expert, but these are some common things that guys do to increase performance.

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