tracing detonation

[Len Sabatine]

     While it's possible that a serpentine system can display
     crankshaft torsional responses , the tension device itself
     can be a noise generator. These noise frequencies
     being variable in nature can certainly excite a knock
     sensor. Solid Lifter cams , forged pistons
     and some exhaust reverbs are just as troublesome.
     Len

>Check out the article in Popular Hot rodding May 2001
>Page 26 they say movement of the belt tensioning
>device is a sign of detonation. In the Dyno Cell they
>video tape the engine under load, then play it back
>to find where the detonation happened. It would be
>interesting to see if we could put a strain gauge
>or other sensor to monitor tensioner movement
>while we are driving.
>
>

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