[TR] Starting a dry engine advice sought

[Paul Dorsey]

 Why do you think the synthetic  oil  might have done that? I ordered some
ZDVP from Moss, So I guess Valvoline racing one might be overkill for me.
Can you have too much zinc?

On Sun, Sep 9, 2018 at 7:46 AM TERRY SMITH <terryrs at comcast.net> wrote:

> Just my experience, but on my last engine rebuild, my lifters were toast,
> having traded much metal with the cam lobes.  I'd run exclusively Valvoline
> synthetic, an otherwise fine oil except for the zinc content.  Now I'm
> running Valvoline 20-50 racing oil.  So far no problems, but we'll know for
> sure at the next tear down.
>
> Terry Smith, '59 TR3A
> New Hampshire
>
> > On September 5, 2018 at 1:59 PM Randall <tr3driver at ca.rr.com> wrote:
> >
> >
> >
> > > I've been told that Valvoline Racing oil has zinc in it.
> > > It's odd that the newer cars don't require it.  In fact, why
> > > is it important?
> >
> > Lots of opinions, here are mine:
> >
> > In a nutshell, it helps protect critical surfaces (like cam lobes and
> > lifters) in case the oil film breaks down (gets rubbed away by the
> relative
> > motion of parts).
> >
> > The TR camshaft (along with many other performance cars) is actually
> pretty
> > aggressive in terms of force developed between the camshaft lobe and
> lifter
> > during high rpm engine operation.
> >
> > Newer engines either use roller lifters (to eliminate the rubbing between
> > lobe and lifter) or less aggressive camshafts (that are less likely to
> rub
> > away the oil film).
> >
> > Honestly, I'm not absolutely convinced that the TR motor needs the extra
> > ZDDP.  But it seems clear that many older engines do (even those not
> > particularly high performance by today's standards); and it hardly seems
> > worth taking a chance by using a lower ZDDP oil.  (AFAIK, all modern
> motor
> > oils still contain some ZDDP, they just have lower amounts.  The oil
> > industry has been searching for a suitable substitute, but I haven't
> heard
> > of them finding one yet.)
> >
> > -- Randall
> >
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> >
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