Re: Polishing manifold head ports

Posted by Janicholson on October 15, 2006 at 17:56:07 from (66.173.50.71):

In Reply to: Polishing manifold head ports posted by FarmallBob on October 15, 2006 at 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

Replies:

• Re: Polishing manifold head ports FarmallBob 11:53:58 10/16/06 (2)
  • Re: Polishing manifold head ports Janicholson 13:07:45 10/16/06 (1)
    • Re: Polishing manifold head ports FarmallBob 13:43:39 10/16/06 (0)
• Re: Polishing manifold head ports forklift 03:53:09 10/16/06 (0)

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