Re: 3 angle valve grinding??

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...

Follow Ups:

Post a Followup Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]