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Tractor Pulling Discussion Forum

porting and polishing

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bobby21

04-09-2007 15:23:09




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I am thinking about trying to port and polish a gas case tractor that will run about 2200 rpm. What is the best way? Do both intake and exhaust ports get polished to a mirror finish? I ve heard only the exhaust ports do and the intake remains rough for some reason? I this true, any insite is appreciated.




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G/MAN

04-10-2007 13:48:56




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 Re: porting and polishing in reply to bobby21, 04-09-2007 15:23:09  
No, you do absolutely NOT want a "mirror finish". Professional cylinder head guys actually like the surface of the port to be somewhat rough (relatively speaking), because the roughness of the port surface tends to hold the air that's right against it stationary, creating a "boundary layer", which will actually increase flow over a mirror-smooth surface, because the moving air can move more efficiently and smoothly "rubbing" against that layer of boundary air than it can against even super-smooth iron. Anyone that tells you to make the ports as large as you possibly can is also leading you astray. The biggest ports in the world won't do any good if the valves they lead to aren't big enough or shaped correctly to handle the extra flow, or if there are other restrictions in the system. Obviously the camshaft figures very large in this, too. Large ports tend to be "lazy" ports, especially at low speeds (and 2200 rpm is low speed for an internal combustion engine) and that laziness can actually reduce flow, cylinder filling, efficiency and power over a properly-sized port that's well-matched to the engine, the engine speed and everything else. Hogging the ports out huge and trying to dump a lot of fuel into an engine not specifically designed to handle tons of air and fuel is about as smart and effective as dropping a tunnel-ram and dual quads on a stock Chevy 350 smog motor that runs out of breathing ability at 4000 rpm. Your buddies may be impressed and it may look cool and SEEM like it should run hard, but it's going to be the biggest dog on the block.

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HOG

04-09-2007 19:44:03




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 Re: porting and polishing in reply to bobby21, 04-09-2007 15:23:09  
Hog it out polish the crap out of it. I know I don't sell crap but do it any way at least you did it yourself and a lot less $$$$.



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long hair

04-09-2007 20:02:30




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 Re: porting and polishing in reply to HOG, 04-09-2007 19:44:03  
tried that hogging on my w-9 but the head a bigger piece of junk now than when i started!



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gearhead0526

04-09-2007 16:14:44




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 Re: porting and polishing in reply to bobby21, 04-09-2007 15:23:09  
Also I believe port matching is more important than hogging out ports on a low R.P.M. engine. just my opinion



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buickanddeere

04-10-2007 17:59:00




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 Re: porting and polishing in reply to gearhead0526, 04-09-2007 16:14:44  
Correct. Clearing away casting flash, lumps and sharp edges will usually improve flow as well. There is more power in the valve shape and valve seats than in the ports.



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gearhead0526

04-09-2007 16:05:12




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 Re: porting and polishing in reply to bobby21, 04-09-2007 15:23:09  
Port intake and exhaust. Polish exhaust. Leave intake to just port. polishing looses the fuels ability to atomize



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B-maniac

04-11-2007 14:50:01




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 Re: porting and polishing in reply to gearhead0526, 04-09-2007 16:05:12  
You people are tripping over dollars to pick up dimes! Get real.



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