Can I shop cut new keeper notches on valve stems?
Can I shop cut new keeper notches on valve stems?
(OP)
Dear Gentlemen,
Every now again I get a hare-brained idea that I need to run by the Eng-Tips wizards. There is no other website that compares to this one when a fellow needs a correct answer. Here is my latest hare-brained notion...
I have a new set of stainless steel forged valves that go in a 32-valve Ford 4.6L DOHC. I want to use stock springs but these valved have the triple groove keeper slots cut a few mm higher to accommodate high-lift (longer) springs. My questions:
#1) When manufactured, are valve keeper slots forged into the valve stem or are they cut on a lathe?
#2) Can I expect a machine shop to be able to effectively cut new sets of keeper slots at the stock locations without any problems i.e., assuming a shop can do this are there any caveats?
Every now again I get a hare-brained idea that I need to run by the Eng-Tips wizards. There is no other website that compares to this one when a fellow needs a correct answer. Here is my latest hare-brained notion...
I have a new set of stainless steel forged valves that go in a 32-valve Ford 4.6L DOHC. I want to use stock springs but these valved have the triple groove keeper slots cut a few mm higher to accommodate high-lift (longer) springs. My questions:
#1) When manufactured, are valve keeper slots forged into the valve stem or are they cut on a lathe?
#2) Can I expect a machine shop to be able to effectively cut new sets of keeper slots at the stock locations without any problems i.e., assuming a shop can do this are there any caveats?





RE: Can I shop cut new keeper notches on valve stems?
Regards
Pat
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RE: Can I shop cut new keeper notches on valve stems?
RE: Can I shop cut new keeper notches on valve stems?
RE: Can I shop cut new keeper notches on valve stems?
RE: Can I shop cut new keeper notches on valve stems?
Mike Halloran
Pembroke Pines, FL, USA
RE: Can I shop cut new keeper notches on valve stems?
As to 'shims'..."lash pads" can be made from bar stock for simple pads in just about any thickness you wish, however, they can be purchased from several mfgrs in thicknesses of a quarter inch. I have a bunch of 0.200" Jag shims that I use as blanks to grind down to whatever thickness I need. Mostly I use the Alfa type cup pads that I had a master machinist and racer make up for me many years ago.
Rod
RE: Can I shop cut new keeper notches on valve stems?
RE: Can I shop cut new keeper notches on valve stems?
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Can I shop cut new keeper notches on valve stems?
These internet sites are where I have bought base shims in the past.
http:
http://
http:/
I also had custom base shims for a Cosworth engine made for me by Isky years ago when I was friends with their design engineer.
Rod
RE: Can I shop cut new keeper notches on valve stems?
RE: Can I shop cut new keeper notches on valve stems?
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules