[TR] Starting a dry engine advice sought

[TERRY SMITH]

Dunno about any change but the label on the jug claims "High Zinc."


> On September 9, 2018 at 8:14 AM Paul Dorsey <dorpaul1 at gmail.com> wrote:
> 
>      Five or 10 years ago I didn’t think there was much of an  zinc ingredient in  Valvoline racing oil. Have things Change D?
> 
>     On Sun, Sep 9, 2018 at 8:09 AM TERRY SMITH < terryrs at comcast.net mailto:terryrs at comcast.net > wrote:
> 
>         > > 
> >         I have, on occasion, had too much of a good time, so yes I'm guessing yes anything has a surfeit of advantage.  If you're running a zinc additive I don't think you'd need to also use racing oil.  I'm just too lazy to mess with it.  And too, I have to top off the oil with fair frequency and don't want to have to track the dilution factor by adding zinc everytime. 
> > 
> >             > > > On September 9, 2018 at 7:56 AM Paul Dorsey < dorpaul1 at gmail.com mailto:dorpaul1 at gmail.com > wrote:
> > > 
> > >              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 mailto: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 mailto: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 
> > > >                 >
> > > >                 > ** triumphs at autox.team.net mailto:triumphs at autox.team.net **
> > > >                 >
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> > > >             > > > 
> > >         > > 
> >     > 
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