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09-20-2014, 09:59 AM
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#1 |
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It ain't gonna be easy.
Join Date: Apr 2008
Location: St. George, SC
Posts: 1,480
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Proper valve lap
Anyone know minimum width of the lap on the valve face when hand lapping? The old valves were worn pretty badly and I wasn't sure how far to go with the new ones.
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09-20-2014, 12:03 PM
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#2 |
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Not Yet Wild
Join Date: Aug 2010
Location: Longview , Texas
Posts: 49
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Re: Proper valve lap
Others may differ, but I shoot for about 1/16" of seat width, centered on face, with a margin of at least 1/16". Check contact area with a little Dykem (or magic marker). After grind, ink face, place valve in head and rotate a turn or two. I have a habit of slapping the valve shut a few times (by hand) as I turn it. Remove and examine for seat contact. Raise/lower seat with appropriate angle cutters (or stones). Don't forget to check guide clearance.
Sorry, I just reread your post and now think that you are trying to lap only. Not a good plan in my opinion. If that's all you can do, well, it's better than nothing, I guess. Think about it. You lap seat and face at room temp. Then you expect these areas to stay in alignment at operating temp......as I said, other may disagree...... Last edited by jay nesbitt; 09-20-2014 at 12:08 PM.. Reason: Reread post |
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09-22-2014, 11:25 AM
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#3 |
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It ain't gonna be easy.
Join Date: Apr 2008
Location: St. George, SC
Posts: 1,480
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Re: Proper valve lap
I overlooked the spec in the bench book... its .040"-.050"
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