Examples of a three angle valve job on a Honda auto engine...
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Valve face recutting VS grinding/lapping
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Forum LongTimerGSResource Superstar
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Originally posted by drhach View Post
Examples of a three angle valve job on a Honda auto engine...
Last edited by Nessism; 11-26-2008, 01:15 PM.Ed
To measure is to know.
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Flago60/notabiker, Back cutting does nothing to the valve seat itself. It is a cut that is above the seat (45) on the valve itself. It removes the 'corner' at the very top of the 45 cut on the valve face. Has noting to do whatsoever with the valve angle on the head or valve. The 45 is not effected at all. If you lap your vales in you will see that the face of the valve is longer than the 45 seat itself, (on the valve). There is margin left. Back cutting up to the edge of the 45 with a smaller angle takes off that part of the valve, knocks the 'corner' off so to speak. Opening up more clearance (valve area) and exposes more of the port for air flow. The valve job isn't effected at all. This is part of the valve that doesn't touch anything. This dosn't affect the longevity or reliability at all. Nothing but a positve gain here. A win-win deal. Check out the fine photo's Nessism posted. Just trying to help out a fellow GSer. Easy and cheap, My flow bench likes it too.1980 Suzuki GS550E, 1981 Suzuki GS 1100EX all stock, 1983 Suzuki GS 1100EX modified, 1985 GS1150E, 1998 Honda Valkyrie Tourer, 1971 Kawasaki Mach lll 500 H1, 1973 Kawasaki Mach lV 750 H2.
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