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[TR] PSI vs Octane

To: Randall <triumphs@autox.team.net>
Subject: [TR] PSI vs Octane
From: Bill Beecher <billbtr3@yahoo.com>
Date: Fri, 17 Apr 2026 17:06:57 -0500
Authentication-results: autox.team.net;
Delivered-to: mharc@autox.team.net
Delivered-to: triumphs@autox.team.net
References: <B84F2FA3-A90D-420B-A324-2CF9AA5680D2.ref@yahoo.com>
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Good evening all,
I have always run regular 87 octane in my TR3(=E2=80=9866 TR4 motor), no kno=
cks or pings.  Don=E2=80=99t know what got me to thinking but there has to b=
e a relation between compression psi and the octane rating I should use.   M=
y compression across all four is 175-180, would I be getting improved perfor=
mance from a higher octane gas? Or just wasting $$ ?
All the best,
Bill B
TS30766L

=E2=80=9CThe harder I work, the luckier I get=E2=80=9D  H. Ford=

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<html class=3D"apple-mail-supports-explicit-dark-mode"><head><meta http-equi=
v=3D"content-type" content=3D"text/html; charset=3Dutf-8"></head><body dir=3D=
"auto">Good evening all,<div>I have always run regular 87 octane in my TR3(=E2=
=80=9866 TR4 motor), no knocks or pings. &nbsp;Don=E2=80=99t know what got m=
e to thinking but there has to be a relation between compression psi and the=
 octane rating I should use. &nbsp; My compression across all four is 175-18=
0, would I be getting improved performance from a higher octane gas? Or just=
 wasting $$ ?<div>All the best,</div><div>Bill B</div><div>TS30766L<br><div>=
<br id=3D"lineBreakAtBeginningOfSignature"><div dir=3D"ltr">=E2=80=9CThe har=
der I work, the luckier I get<span style=3D"font-size: 19pt;">=E2=80=9D &nbs=
p;H. Ford</span></div></div></div></div></body></html>=

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