Timing belt tensioning with a Snark
Having just installed a new timing belt on my '87 Turbo Esprit, I was confronted with the usual dilemma of setting the tension.
I've seen the posts about the newer method of using resonant frequency, along with suggestions regarding microphones and guitar tuners. ...but then I remembered that my wife plays harp and uses a Snark to tune it.
For those that aren't familiar with them, a Snark is a device for tuning stringed instruments, and are available from Amazon for ~$15.00.
The tension specs for the 4-cylinder Esprits call for a frequency of between 100 and 110 Hz on a cool engine, measured between the cam and distributor drive sprockets.
The frequencies of the musical notes in that range are:
G = 98.00 Hz
G# = 103.83 Hz
A = 110.00 Hz
I wasn't sure if the Snark would be sensitive enough to detect a "plucked" timing belt, but it worked beautifully.
Set to "microphone" (as opposed to "vibration") I held it about an inch from the belt and you can see the results in the video:
Newer Snarks include a frequency readout as well as the musical note, so I'll be buying one of
my own to keep in my toolbox.
1987 Turbo Esprit
1963 Elite (The works twin cam)