Imho its all about compression ratio. I believe once you get to about 9:1
you need premium.
Wikipedia shows it to be 9:1.
Wikipedia show a TR4 and TR4a at 9:1, which makes sense, since they are
extremely similar to a TR3
W shows a TR250 at 8.5:1
W shows a spitfire at 8:1
I think that's your answer
-----Original Message-----
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of TERRY SMITH
Sent: Sunday, September 23, 2018 8:26 AM
To: triumphs@autox.team.net
Subject: [TR] Octane
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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