I was being imprecise saying that a radius isn't proper--most flat
tappets have some spherical crown, but it's a very large radius, and
the best lifters I've found by far for wear on the cam and the lifters
at high RPM (6800 shift point) are the ceramic ones I have in Peyote's
two-year engine, and they have no crown at all--at least none i can
find with a surface plate.
Unfortunately I can't find any more, and I hear they can suddenly
break, but my experience is an engine run hard for two years,
including the fourteen events of the All Aluminum tour, with
absolutely NO wear on the cam and not a mark on the lifters.
I've seen tappets that have been reconditioned with radius that more
like what you see with hydraulic tappets. I think that's a really bad
idea. Given my druthers I'd rather have the completely flat.
On Mar 15, 2008, at 10:20 AM, John McCue wrote:
> That's not what the guys at Huffaker or APT say. John
> ----- Original Message ----- From: "Bill Babcock" <Billb@bnj.com>
> To: "Larry Young" <cartravel@pobox.com>
> Cc: "FOT" <fot@autox.team.net>
> Sent: Saturday, March 15, 2008 12:58 PM
> Subject: Re: [Fot] Lifter Reconditioning
>
>
>> Larry, a crown isn't proper. They call these flat lifters for a
>> reason--they need to be dead flat. The cam is designed to work with
>> a flat lifter. A crown will reduce the contact area and probably
>> make the lifter stop rotating. A pretty sure way to toast your
>> lifters and cam.
>> second, reconditioning lifters is pretty iffy anyway. These things
>> need to be as hard as they can be. Grinding them without some
>> hardening process involving vile chemicals known by the state of
>> california to cause instant death and an alchemist is scary. What
>> you need--what we all need, is some very hard lightened lifters
>> with very flat non-chamfered, non-crowned faces.
>> On Mar 15, 2008, at 8:15 AM, Larry Young wrote:
>>> Can someone recommend a shop that reconditions lifters, i.e.
>>> resurface
>>> the foot of the lifter with the proper crown? I've seen a few
>>> places on
>>> the web, but some seem rather expensive, e.g. Integral Cams
>>> $11.70 each,
>>> Web Cams $5.00 each.
>>> Larry Young
>>> _______________________________________________
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>> Bill Babcock
>> Babcock & Jenkins
>> Billb@bnj.com
>> 503.936.7660
>> www.bnj.com
>> _______________________________________________
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>
Bill Babcock
Babcock & Jenkins
Billb@bnj.com
503.936.7660
www.bnj.com
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