[TR] Octane

[Geo Hahn]

Terry -

I rather think it was due to compression ratio more than anything else.
But you may just have to experiment a bit to see what works (adjusting
advance, listening for ping).

My TR4 uses premium at off-brand stations but seems okay with regular from
Shell or Chevron.  My TR3A doesn't seem to care what I put in it, runs fine
on almost anything.

Geo

On Sun, Sep 23, 2018 at 6:26 AM, TERRY SMITH <terryrs at comcast.net> wrote:

> Just curious.  Why is Premium gasoline recommended for a TR3 (and I
> suppose other Triumphs?)while regular is just fine for other vintage cars.
> I know it's to prevent knocking, but how and why?  Does it have to do with
> being a short-stroke engine or something?
>
> Thanks, everyone,
> Terry
> ** triumphs at autox.team.net **
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