[TR] Car Harmonics

[John & Pat Donnelly]

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