Vehicle rpm and dwell measurement system

F - Mech Eng,Light,Heat,Weapons – 02 – P

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F02P 17/00 (2006.01) F02P 17/06 (2006.01) F02P 17/10 (2006.01) G01M 15/04 (2006.01) G01P 3/48 (2006.01) G01P 3/489 (2006.01)

Patent

CA 1050111

ABSTRACT OF THE DISCLOSURE A high energy ignition adapter circuit prevents trig- gering of the counter by a false indication of the opening of the points due to a waveform peculiar to low coil signals pro- duced in vehicles using high energy ignition systems. A timing light delay circuit having a variable delay is incorporated with the timing light to produce the delayed signal proportional to distributor advance, the delay being adjustable within two selectable ranges. By measuring and displaying the computed dwell for each cylinder in sequence, distributor mechanical wear associated with shaft bearings and drive gears may be detected. Power contribution and dynamic relative compression for each cylinder may be measured by using the counter to measure the time that the points are open, and the time that the points are closed, for each cylinder in sequence, and displaying the measurements.

245865

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