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Re: 3 angle valve grinding??
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Posted by BushogPapa on November 12, 2004 at 19:13:48 from (152.163.101.7):
In Reply to: 3 angle valve grinding?? posted by Lynn Kasdorf on November 12, 2004 at 13:03:22:
Many an old valve job was done useing only 1 or 2 cuts..one for the seat, and a "Narrowing cut" to move the edge of the seat in on the valve.. On 3 or 4 or 6 angle jobs, the INSIDE area of the seating surface is worked to a contour that flows the incomming or exiting gasses over the valve and seat more efficiently ( Like a Venturii) What I like to do is cut the valve face with 3 or 4 cuts, and polish the valve until the "facets" disappear and it takes on a "Tulip shape"...then cut a very fine single cut on the valve for seating purposes.. It is a Beautiful thing to see..and it DOES make more power.. I like about 1/4 degree interferance angle. Not for the "average Joe" , but once in a while I get to do one of my own.. What helps too, is to have the Block Bored with "Torque Plates" bolted on--simulating the torque of the head bolts...Then, using Gap-less rings for a near-perfect seal in the cylinder...
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