Vacuum retard delay valve

Details Vacuum retard delay valve Vacuum retard delay valve

1975-04-14

1976-12-07

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

137468, 1375133, F02P 500

Patent

active

039956075

ABSTRACT:
An internal combustion engine for automotive vehicles is started and operated with decreased fuel enrichment when the engine is cold by delaying spark retard as the vehicle is accelerated to save fuel and reduce accumulated pollutants collected during warm up. A valve is provided between the carburetor spark port and the distributor vacuum advance cylinder to permit unrestricted airflow from the vacuum advance cylinder to the spark port at all temperatures and to restrict airflow from the spark port to the vacuum advance cylinder when the engine operating temperature is below a predetermined temperature. When the engine operating temperature attains the predetermined temperature airflow is unrestricted in both directions and the vacuum advance operates in a normal manner.

REFERENCES:
patent: 3472213 (1969-10-01), Walker
patent: 3491735 (1970-01-01), Walker
patent: 3646920 (1972-03-01), Vartanian
patent: 3729132 (1973-04-01), Ludwig
patent: 3804326 (1974-04-01), McIntire

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