Abstract: Two vacuum chambers at the same under-atmospheric pressure produced by connection to the engine intake are provided within a common casing, and intermediate space in the casing at atmospheric pressure. The membrane of one of the vacuum chambers is connected to a flanged sleeve and the control rod which actuates the distributor timing shift is permitted to move over a limited range without coming into driving contact with either flange of the sleeve, while it is always driven by the membrane of the other vacuum chamber, to which it is affixed. Stops, including an apertured partition in the casing of one of them, and springs are provided to produce the limits and slopes of the portions of the shift characteristic that make up the composite characteristic of the device. A bellows is provided where necessary to complete the vacuum chamber system.

Abstract: An ignition system for a spark-ignition type internal combustion engine comprising an ignition device capable of performing the spark timing control function, wherein in order to improve the engine torque, a temperature detecting element for detecting the temperature having an effect on the engine torque efficiency is provided in addition to the ignition device, so that the ignition device is actuated to advance the timing of the spark at a lower temperature as compared with that employed at a higher temperature in accordance with the temperature detected by the temperature detecting element.

Abstract: An ignition system for a spark-ignition type internal combustion engine comprising an ignition device capable of performing the spark timing control function, wherein in order to improve the engine torque, a temperature detecting element for detecting the temperature having an effect on the engine torque efficiency is provided in addition to the ingition device, so that the ignition device is actuated to advance the timing of the spark at a lower temperature as compared with that employed at a higher temperature in accordance with the temperature detected by the temperature detecting element.

Abstract: An ignition system for a spark-ignition type internal combustion engine comprising an ignition device capable of performing the spark timing control function, wherein in order to improve the engine torque, a temperature detecting element for detecting the temperature having an effect on the engine torque efficiency is provided in addition to the ignition device, so that the ignition device is actuated to advance the timing of the spark at a lower temperature as compared with that employed at a higher temperature in accordance with the temperature detected by the temperature detecting element.

Abstract: An ignition system for a spark-ignition type internal combustion engine comprising an ignition device capable of performing the spark timing control function, wherein in order to improve the engine torque, a temperature detecting element for detecting the temperature having an effect on the engine torque efficiency is provided in addition to the ingition device, so that the ignition device is actuated to advance the timing of the spark at a lower temperature as compared with that employed at a higher temperature in accordance with the temperature detected by the temperature detecting element.