Yep, though I have never really tracked what that rpm is. My car is actually
a little quieter with the OD off then with it on....
-----Original Message-----
From: John & Pat Donnelly <pdonnel1@san.rr.com>
To: triumphs@autox.team.net
Sent: Mon, Oct 19, 2009 10:35 pm
Subject: [TR] Car Harmonics
Does your Triumph have a harmonic? What I mean by that is . is there a rpm
that your car seems to get quiet? Where it just seems to hum along. The
muffler resonates right, the engine purrs, the drive train is in total
balance? Mine gets "in balance" around 4000 rpm.
So what causes this? Can I tune it? Where do I start? Will this get
expensive?
Johnnie
'67 TR4A
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