Jean :
I don't recall now if Millers VSP had it or not, but look for the additive
that has manganese, or MMT (methyl manganese tertiary something or other
<g>) in it. Not only can it boost octane up to 7 points (ie making 98 into
105), but used regularly it also reduces the engine's octane requirements.
(Yes, I know that sounds crazy, but I've confirmed it on my TR3. After
3-4 tanks using the recommended amount of MMT additive, I can go about a
tank and a half without anything before the engine starts pinging again.
As a steady-state, I find I can use much less than the recommended amount,
as long as I use it in every tank.)
Aviation gasoline is definitely not the right stuff to use in cars,
although it can sometimes be used as a source of tetraethyl lead. Around
here, you can buy racing gasoline for about the same price, which works
much better (but of course is not legal for use on public streets).
Randall
Lakewood, CA, USA
On Wednesday, May 17, 2000 4:04 AM, J.H. Roulleaux
[SMTP:Jean.Rouleaux@skynet.be] wrote:
>
> I think lead is not the major problem with modern gasoline to be
> used in our cars. The modern gas is designed for todays cars and
> has to fullfil ecological requirements.This is all in contradiction to
> the prerequisites to the combustion in old engines. My TR6 manual
> states that the "minimum" octane rate to run the engine is 102,
> and this is far from the max 98 offered today. A lead substitude
> with octane booster , like Millers VSP, could eventually bring it up
> to 100, but this is still too low. When I bought the car in 73 the
> highest gas rate sold in Europe was 105 octanes. AVGAS used in
> Proplines used 110. I remember the problems we had in our Flying
> Club when 100LL was introduced, to use it in cars is not wise,
> because the additives in this fuel are designed to drive aircooled
> engines at around 2700 RPM. I believe there may be less pinking
> but other problems might develop.
> Regards - Jean R. 70TR6 PI
> 60 TR3A
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