The rates of injection and heat release of two designs of indirect-injection diesel engines have been studied over a range of speed, load, and timing. The relationship between these two quantities is significantly different from that previously found for open-chamber engines. It is suggested that only part of the air is available for mixing in a divided-chamber engine, and the movement of the piston controls to some extent the availability of the remaining part of the air. A semi-empirical scheme is proposed for relating the rate of injection to the rate of heat release for this type of engine.
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