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Tractor Pulling Discussion Forum

Porting and Polishing

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CHAD H

02-22-2006 19:21:20




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I am new at tractor pulling. A have a 1944 JD A that is bored .125 over and 14.9 tires on press steel rim. Everything else is stock. I pull 4500lbs class. 2nd gear is to fast, powers out. 1st gear spins out. If I move the draw bar out to rear more will this put more pressure on rear wheels?
Also wondering if porting and polishing would help in hp gain? What is the processing in doing this? How much metal do I take off? And where do I take from (intake, Exhaust, head)?
And what do I use for polishing?
Thank you guys very much fopr any information.

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jdjack

02-23-2006 15:55:41




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 Re: Porting and Polishing in reply to CHAD H, 02-22-2006 19:21:20  
Ok, so if I move the drawbar out farer and put weight on front, that will put more traction on rear tires? I see guys that can pull about 30 or more feet than me and then spin out, WHY?



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CLIFF S

02-23-2006 06:43:22




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 Re: Porting and Polishing in reply to CHAD H, 02-22-2006 19:21:20  
Like drew said longer will put more levarge on it and lift the front OR put more pressure on your back tires and make you go farther down the track, The stocker the tractor the longer the drawbar And the more Modified the Shorter the drawbar, And yours sounds like its more stock to me!



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2 Cylinder

02-23-2006 05:37:36




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 Re: Porting and Polishing in reply to CHAD H, 02-22-2006 19:21:20  
I agree, leave hitch in as far, and high as possible. One thing you can look for in your manifold is, are there any baffles on the exhaust side, if there is, I gained several horsepower just by removing it.



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Drew

02-22-2006 19:31:08




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 Re: Porting and Polishing in reply to CHAD H, 02-22-2006 19:21:20  
You want the drawbar as close to the rear axle as the rules allow. The closer the hitch point it to the rear axle, the more direct downforce is applied to the rear tires. The longer the drawbar is, the more leverage it has to lift the front axle.

With the engine you describe, I would not touch the exhaust runners. On the intake, just knock any casting flash out and I would roll back the edge of the "eyebrow" around the intake valve. The most important area to look at is how well your manifold and head line up. Make sure the ports match up well.

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770

02-23-2006 15:56:50




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 Re: Porting and Polishing in reply to Drew, 02-22-2006 19:31:08  
If he has an "all fuel" manifold, wouldn't a regular gas manifold be better???



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Drew

02-23-2006 20:48:33




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 Re: Porting and Polishing in reply to 770, 02-23-2006 15:56:50  
Yes, a gas manifold would be better than the all-fuel manifold. A Johnson manifold would be yet another step up.



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