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Farmall & IHC Tractors Discussion Forum
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Polishing manifold head ports

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FarmallBob

10-15-2006 14:30:47




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Is there any special way to polish the ports to a head and manifold? Would appreciate any tips from you folks that have done it, what you used, how long does it take, what grade grinding stone, emery, carbide, anything that would make the job easier, better. I really enjoy this forum. It doesn't get much better that this! Thank you.
Bob




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Ken B

10-16-2006 14:53:53




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 Re: Polishing manifold head ports in reply to FarmallBob, 10-15-2006 14:30:47  
When I did mine after shaveing 100 off. I opened them as large as I could takeing any hard turns out as much a possable. The intake I left with some texter to it. But the exaust was as slick as I could get it. And I used everthing on them. Just keep going back to the hardware store and looking fo something better.



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Janicholson

10-15-2006 17:56:07




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 Re: Polishing manifold head ports in reply to FarmallBob, 10-15-2006 14:30:47  
Sorry to say, the polishing of manifold and ports in a Farmall is not going to produce any power improvements. The issue is velocity. The low speed design of these engines is radically different than the high RPM, high pumping efficiency needed in an automobile, or race car. A slight rippled surface such as a casting finish can sdd as much to the laminar flow of the port at the velocities found in a Farmall, as polishing them. In the neighborhood of 2000 RPM it just isn't important. The 3 main bearing crank will not live very long at extreme RPM. Nor is the long stroke small bore engine good high speeds. Piston velocity is excessive. These are torque producing designs.
Power and reliability are key ingredients. Compression ratio, good engine timing just short of spark knock, and larger displacement through increasing the bore, and maybe stroke if you are serious, will be much more productive. I hope this helps, Pullers will say different things about the issue, but they live with different animals in their machine sheds. JimN

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FarmallBob

10-16-2006 11:53:58




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 Re: Polishing manifold head ports in reply to Janicholson, 10-15-2006 17:56:07  
Jim, That is what I needed to know. Thanks! Question on large bore, if you decrease the CID by placing more compression into a smaller space, are you defeating the purpose? Are you getting more HP? Thanks again!
Bob



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Janicholson

10-16-2006 13:07:45




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 Re: Polishing manifold head ports in reply to FarmallBob, 10-16-2006 11:53:58  
Good question, the answer is not a bit. The displacement of an engine is its swept volume. the area of its piston/s (A=pi times radius squared) times the stroke, times the number of pistons. The combustion cahmber volume is not involved. A 283 chevy with low compression heads has the same engine displacement as a 283 with special low CC track heads. The higher the compression ratio, and larger the displacement, the more power (untill it becomes stressed to the point that no fuel will burn in it without knocking, or the cylinder walls are so thin from boring that they break. JimN

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FarmallBob

10-16-2006 13:43:39




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 Re: Polishing manifold head ports in reply to Janicholson, 10-16-2006 13:07:45  
Jim,
Some of my pulling buddies say milling .100 off the head will give you more HP, and I want to stay in that gray area of 10% over stock so I am not disqualified. It used to be when the club was young you had a good chance of coming in first, second, third, or fourth, and all you had to do was have a good tuned tractor. Now that the club is older you have to work the grey area very carefully, plus a good tune up. Thank you.

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forklift

10-16-2006 03:53:09




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 Re: Polishing manifold head ports in reply to Janicholson, 10-15-2006 17:56:07  
after reading the above post I cant say if it did any good or not but I used a brake cyl hone on mine. Polished them baby's right up and opened the intakes in the head a little. Use some light oil or something when your done. JS



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