[TR] Octane

[Wbeech@flash.net]

It’s all about compression, higher compression needs higher octane to prevent the pinging/knocking that will damage the pistons.   That said, I usually run regular grade in my stock TR3 or maybe step up to mid grade during the hot Texas summer months.  
Bill B

Sent from my Handspring Treo

On Sep 23, 2018, at 9:51 AM, Geo Hahn <ahwahneetr at gmail.com> wrote:

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
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