What motor oil are you using? Lack of zinc may be a cause of the lifter
pitting. Joe(B)
---------- Original Message ----------
From: Christian Marx via Fot <fot at autox.team.net>
To: "fot at autox. team. net" <fot at autox.team.net>
Subject: [Fot] Do(o)med or flat lifters?
Date: Mon, 23 Jul 2018 12:08:28 +0300
In the past we had this discussion.I've bought some high quality lifters from
USA, made from tool steel I suppose. 400$ they've cost..... and started to
fail. On 3 of them, the very center does show e few pittings. Also visible that
only a small part of the Cam is used.. The cam is okay The machine shop will
grind the lifters dead flat, as they should be, they say. CheersChris
Am 18.07.2018 02:12 schrieb "fubog1 via Fot" <fot at autox.team.net>:
Yes, lacking access to a Cam Doc, you can use a set of V or bearing blocks, a
degree wheel, dial indicator, and a bit of time, checked at 5 cam degrees,
works fine.I'm still old school though, I plot them out on graph paper!
That will give you the lobe profile but most folks don't have the full specs
on the cam, usually just advertised lift and duration.Since the tip of the lobe
usually starts to go away first, a simple lift measurement will reveal the
worst, best done with a dial indicator cuz some (cheap) cams are ground on
different base circles.Generally, ramp wear is unusual if the tip is still OK,
although there can be exceptions.
Glen.
-----Original Message-----
From: timmmurphh <timmmurphh at gmail.com>
To: 'fubog1' <fubog1 at aol.com>; rbtr3a <rbtr3a at cox.net>
Sent: Tue, Jul 17, 2018 12:38 pm
Subject: RE: [Fot] Cams
By degreeing the cam using increments of 10 crankshaft degrees (5 camshaft
degrees) and then plotting the results in Excel, it is possible to get a very
accurate picture of the profile of the cam.? I?€™ve attached a
spreadsheet showing an intake and exhaust lobe comparison two years apart of
our Kastner G3 cam for reference.? Tim Murphy#317 TR4? From: Fot <fot-bounces
at autox.team.net> On Behalf Of fubog1 via Fot
Sent: Monday, July 16, 2018 6:31 AM
To: rbtr3a at cox.net; fot at autox.team.net
Subject: Re: [Fot] Cams? Generally any obvious wear or pitting would make it
unserviceable, but the wear isn't always so obvious.You can measure the lift
and compare to spec, that will show any worn lobes, but the best way is to find
someone who has a "cam doctor". It's a machine that sets it up and measures the
complete profile.Usually if there is anything apparent that suggests that there
may be problems, there are...? Glen? ? -----Original Message-----
From: rbtr3a--- via Fot <fot at autox.team.net>
To: fot <fot at autox.team.net>
Sent: Sun, Jul 15, 2018 6:47 pm
Subject: [Fot] Cams
How do I determine if a cam is good or bad. If there are any marks on it does
that make it bad. I do know that two of the lifters has pitting on the surface.
Ronnie
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