Abstract
Restraining the initial combustion and promoting the diffused combustion are of utmost importance to improving the fuel economy, exhaust gas emissions, and noise of the indirect injection (IDI)diesel engine. The authors closely studied a new combustion system which features a refined jet passage and a refined prechamber. The new combustion system offers the optimum discharge coefficient of the jet passage and improved diffusion and penetration of jet in the main chamber. Installed in a Mitsubishi S4S diesel engine (swirl-chamber system and four cylinders of 94 mm bore and 120 mm stroke each) and tested, the new combustion system was proven to reduce the engine fuel consumption, smoke emission, particulates, and noise.
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