Grinding Valves and Seats

Rodney Ebersole · Posted: Tue Aug 14, 2001 5:39 am Post subject: Grinding Valves and Seats

Just getting the tools lined up but now I need to now what what angels to grind them at. Ex. valve 44' and Ex. seat @ 45' ? then the Intake valve 29' and seat @ 30' ? Is it the smaller the angle of the valve the farther up on the seat the finail surface will be? What is the typicail runout of a new briggs valve?

Rick Crow · Joined: 18 Jul 2001 Posts: 49 Location: Albany NY

Those angles will work, however since it sounds as if you are building an open or outlaw motor you are better off doing a 3 angle cut. If these motors are for stock or superstock classes, You might want to check the rules. Most clubs don't allow valve grinding in a stock class.

John Neilson · Posted: Wed Aug 15, 2001 5:10 pm Post subject: Grinding Valves and Seats

Rodney,
IKF rules for stock and superstock allow for grinding valves and seats. The dimensions are very clear in the rule book. The new B&S valves are good to lap right out of the box.
If you intend on grinding the seats, make sure that the mandrel is a solid one. I have seen expanding mandrels that are too thin, and will flex too much. Also, you might want to invest in a seat removal/install kit. If you grind enough seats you will need to replace them.
Get a couple of junk blocks to practice on, the seats are a marginal press from the factory.

John

Rodney Ebersole · Posted: Sat Aug 18, 2001 6:26 am Post subject: Grinding Valves and Seats

Thanks, I have been having some fun getting all the stuff going. I hope practice will make things go a little quicker plus I don't want to work on my blockzilla project untill I have mastered moveing, replaceing, sizeing, welding, and wiring all my spare parts togather that I have around. This learning curve can hurt, I cut open my thumb the first time I tryed out my new (old) honeing machine on a sleeve. Outch! I need to keep them fingers for driven and picken on them parts.