Determining engine compression from starter motor current

Details Determining engine compression from starter motor current Determining engine compression from starter motor current

1975-06-19

1976-04-27

Myracle, Jerry W.

Measuring and testing

Vehicle chassis

Steering

73116, G01M 1500

Patent

active

039525864

ABSTRACT:
Satisfactory or unsatisfactory engine compression is diagnosed by comparing the amplitude of the starter motor current, when cranking an engine having its ignition inhibited, with a reference value. The reference value is adjusted in accordance with the intake manifold absolute pressure, as determined from measurements during the test of ambient pressure and intake manifold vacuum.

REFERENCES:
patent: 3421367 (1969-01-01), Mears et al.
patent: 3485093 (1969-12-01), Muller et al.

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