Stu,
What I have heard recommended is over 0.1 for either of z or p. Check
out Barney Gaylord's site for some info on this:
http://mgaguru.com/mgtech/engine/of104a.htm
And also search for other articles there.
Charlie
On 3/16/2011 6:06 PM, Stuart Keen wrote:
> Hi Y9all
>
> I9ve been reading about ZDDP and flat head engines and before I get into
> trouble, thought I9d better get some recommendations from the experts..
>
> Some time ago (on this site, I believe) I read that Valvoline VR-1 racing
> oil was the recommended oil for TDs because it contained ZDDP. So that9s
> what I have been using. But is it enough. I see Moss sells ZDDPlus additive
> so made the assumption that perhaps the ZDDP in VR-1 was not sufficient. So
> I wrote the manufacturer. Here is their reply:
>
> 3Good to hear from you.. I'm not up to speed on the factory recommendation
> for Zn and P content of a 1951 MGTD.. I suggest that you ask the engine
> rebuilder, or find the original requirement for Zn and P content
> Then you
> can choose any oil you like, and add ZddPlus until you get the proper
> dosage.
>
> ZDDP is an anti-wear molecule that activates with temperature and pressure.
> When activated, the ZDDP molecule creates a "glass-like" barrier that
> prevents the metal from touching metal.. When the temp/pressure subsides,
> then spent ZDDP simply goes into solution. ZDDP has been around since the
> start of WWII
> Most modern engines use roller cams and have no need for
> ZDDP
> but a few of us drive flat-tappet vehicles.. and ZDDP is absolutely
> required..2
>
> For me that answer was a non-answer. 3Go to the manufacture of the engine2.
> Hmmm. Anyway, does anyone have an educated opinion? Should I be adding ZDDP
> to VR-1 or just oils which contain no ZDDP. On the Valvoline web site I
> found that Valvoline VR1 Racing Oil contains .13% of Zinc and .12% of
> Phosphorus (ZDDP).
>
>
> Comments? Thanks
>
> Stu
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