[Mgs] [MG-MGB] Delta Cam Lash

[Rick Lindsay]

True all around.  I did not mean to imply that cam wear affected the
measurement but rather, we are talking about the precision of the thermal
expansion of metals and how that might affect performance when there are
typically much sloppier tolerances elsewhere in our old engines. :-P


rick


--- On Tue, 5/26/09, Max Heim <max_heim at sbcglobal.net> wrote:

> From: Max Heim <max_heim at sbcglobal.net>
> Subject: Re: [Mgs] [MG-MGB] Delta Cam Lash
> To: "MG List" <mgs at autox.team.net>
> Date: Tuesday, May 26, 2009, 1:39 PM
> Hmm, actually, I would have thought
> that cam wear is irrelevant? The valve
> is closed when it's closed, regardless of cam lift. For
> instance, my former
> cam had 0.20" wear on the #2 lobe, but I could still set
> the valve
> clearance.
>
> I understand your point about meaningful levels of
> accuracy, in general, but
> this particular measurement is not affected by wear -- in
> fact, it is
> deliberately contrived to adjust for wear.
>
> --
>
> Max Heim
> '66 MGB GHN3L76149
> If you're near Mountain View, CA,
> it's the primer red one with chrome wires
>
>
> on 5/26/09 11:15 AM, Rick Lindsay at rolindsay at yahoo.com
> wrote:
>
> >
> > Max wrote,
> >
> >> So my contention is that setting them cold is
> equally accurate,
> >> in theory, and more likely to be consistent, in
> practice (in
> >> those cases where the factory has provided this
> figure, of course).
> >
> > Knowing all the while that the cam wear may be greater
> than the precision of
> > either measurement technique. :-P  This all feels
> to me like using a
> > micrometer to select which pipe wrench to use.  I
> have ALWAYS set valve
> > clearances on dead-cold engines; all marques, all
> years.
> >
> > And yes, I have an LBC again - as was expected. 
> I now own a 1962 Triumph
> > TR3b.  72nd from the end of TR3 production. 
> It is a superb specimen.
> >
> > Rick
> > PS: My apologies for using the T-word in mixed
> company.
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