Re: Valve grinding

Posted by Janicholson on February 01, 2006 at 06:26:11 from (199.17.6.175):

In Reply to: Valve grinding posted by Kelly C on January 31, 2006 at 21:16:17:

My opinion is that it is interesting, relatively easy, and can improve the performance of engines, even slow speed tractor engines, when done with finesse.
K.O. Lee, Souix are fine names (of old) that serve industry. The valve grinder table top unit is the most expensive component.
Automotive engine rebuilding texts from an author named CROUSE are fine additions to reading. Performance valve machining/porting is another topic area that is important.
3 rules:
1}Margins on valve heads are to be no less than 1mm.
2}Seat should contact face at 75-78% of the distance from the smallest part of the face toward the margin.
3} seat should be dressed at an angle one or two degrees less than valve so that the contact between them is a narrow ring at the above mentioned ~3/4 distance out on the face.
Do it.
JimN

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