setting ignition curves without dyno

Greg Hermann bearbvd at sni.net
Fri Nov 13 04:04:49 GMT 1998


>Greg Hermann wrote:
>>
>> >Tom Sharpe wrote:
>> >>
>> >> Greg Hermann wrote:
>> >>
>> >> > >How about this idea..............actually build a dyno into your car.
>> >Put a strain gauge on the driveshaft. You might need to cuctom make a
>> >shaft with a torsion bar in it.
>>
>> NO--good, properly done strain gauges on a standard drive shaft would do it.
>>
>>  If so, put in an inductive device to charge the battery for the transducer
>> as well, and a centifugal switch
>> >to turn it on when the shaft rotates.
>>
>> If you are saying you have a way to pick up the output from the gauge
>> bridge on the shaft without slip rings, PLEASE give more details--because I
>> already have a tranny with an hydraulic retarder which turns at converter
>> turbine speed (and a lock up clutch), So I wanna put the strain gauge
>> bridge on the flexplate. But slip rings would be a machinist's nightmare in
>> this location. With a non-contact pick-up, I would have a dyno!!
>>
>> TIA for any ideas--Although, as I write, the idea of putting the bridge
>> onto the converter housing--picking up REaction instead of action-- has
>> popped into my head! Have to ponder on that one some!! Might only require
>> enough dyno time to calibrate the bridge output!
>>
>> TIA for more ideas!!
>>
>> Regards, Greg
>There are strain gauge units with wireless telemetry built in. Have not
>got the manufacturers or venders names handy, but are used in industrial
>vibration analyses etc. I know one of the major suppliers is british.

Will go look in my Omega books, and then try to figure out who they buy
them from before marking them up beyond all reason!!

Regards, Greg





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