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Fifty50Plus · Posted: Tue Feb 28, 2012 2:03 am Post subject: Regrind lifters?

I've found a machinist who regrinds Porsche 356 and air cooled VW lifters. He puts a .001 in. taper on them for reuse in engine rebuilds with new cams. Does anyone have an idea as to whether 924 lifters can be reused if this is done to them?
Chuck
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

emoore924 · Joined: 13 Apr 2004 Posts: 2822

There was some considerable discussion on this topic a ways back. Something about grinding off the "hardened" layer on the surface of the lifter. Not sure whether we ever came to a fact-based definitive conclusion but IIRC, it was "buy new lifters"...

That being said, I've reused lifters without having problems as long as they don't have any discernable wear, gouging or pitting on the flat surface. Others will have opinions on this but that's my personal experience...

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

My two cents on this: I went new because I had just dropped a ton of coin on a cam, and the warranty required new lifters.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

daniel · Joined: 18 Jun 2009 Posts: 686 Location: Sydney, Australia

I have just done a season and a half of racing on a cam that had reground lifters. No visable wear and no need to adjust clearences.

Go for it
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet

mikebola · Joined: 07 Sep 2009 Posts: 361 Location: Parkside, PA

what are the requirements for the cores, and how much do they charge? to they do anything to harden or treat the bearing surfaces?
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proud owner of a 1979 924 Sebring Edition with a 931 trans that looks horrible but somehow runs...

daniel · Joined: 18 Jun 2009 Posts: 686 Location: Sydney, Australia

I have had two sets done, I beleive they only grind them no hardening. Regarding cost I have no idea as it was part of a bigger job on both occasions but most places charge in the order of $10 ~ $15 per lifter
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet

924RACR · Posted: Tue Feb 28, 2012 11:06 pm Post subject:

I seem to recall a suggestion that they should be hard chromed after grinding.

Let me see if we can get our resident machining expert to weigh in...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Julian · Joined: 24 Jan 2011 Posts: 74 Location: Oxford Ohio

My valve grinder is set up to reface lifters. Never get requests to do, it so I've only done my own