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Mark McClure Mark McClure is offline
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Join Date: Jul 2002
Location: Canberra Australia
Posts: 440
I have been under the impression that lapping in valves is a way of reseating them in the seat. The more you lap the lower the valve is seated and the more the face is matched.

Snowman - I can see that if you just spin the valve you would get ridges. and as things expand and change it causes an issue .

the way I have been taught is to rotate only a small amount then lift the valve and move it around and repeat. This way each face is guaranteed to mate well without groves

My dad has a hand tool like a hand drill that actually rotates 90degrees both ways. you then lift the valve and move it round.

I have been planning to lapp my vavles on the next rebuild but you have me thinking about it now!
Old 05-19-2005, 12:20 AM
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