​Isuzu 4JG1 Series Engine

The diesel engine has the highest thermal efficiency (engine efficiency) of any practical internal or external combustion engine due to its very high expansion ratio and inherent lean burn which enables heat dissipation by the excess air.The Isuzu 4JG1 engine is a compact and efficient diesel engine. As a part of the J-series, it's one of the most used engines for commercial applications.
The diesel engine has the highest thermal efficiency (engine efficiency) of any practical internal or external combustion engine due to its very high expansion ratio and inherent lean burn which enables heat dissipation by the excess air.