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Propane (LPG gas) in the combustion air intake of a diesel engine acts as an accelerant, promoting the even burning of diesel fuel, and producing more complete combustion. This results in more power being produced. Propane by itself will not self-ignite inside a diesel-fuel compression-ignition engine by the heat of compression alone. During the compression stroke, the air/LPG mixture is compressed and the temperature is raised to about 400°C, not enough to ignite the LPG, which has an ignition temperature of about 500°C. When diesel fuel is atomized into the cylinder under high pressure, it immediately self-ignites (diesel ignites at about 385°C.), and causes the LPG to burn as well. Since the LPG is in mixture with the air, the flame front from the diesel spreads more quickly, and more completely, including igniting the air/fuel mixture which is in contact with the cylinder walls, which are cool in comparison to the super-heated air inside the combustion chamber. Much of the cleaner burning of the fuel is attributed to this ignition against the "cooler" components of the engine, and accounts for raising the percentage of fuel burned from a typical 80% for a well-tuned diesel engine running on pure diesel fuel alone, to 93-95% with the addition of LPG. Obviously, this more complete combustion also gives a boost in power, with an accompanying increase in fuel economy and reduction of pollutants.

Turbocharged diesel engines are able to realize a significant increase in power by using LPG fumigation. While the usual suggested increase is considered to be approximately 20%, by careful management of the gas introduction, power gains of up to 40% are possible. There is a very fine line between lots of extra power and reducing an engine to scrap metal in a hurry, so consider this before you choose the high horsepower route. Turbocharged diesel engines are, by design, blessed with a lean air-to-fuel ratio, and can be fed concentrations of LPG up to about 6-8% of the intake air volume.
TDI (Turbo Direct Injection) engines have shown dramatic power increases when properly equipped with LPG injection, combined with a computer engine management upgrade chip.

The addition of propane to the airflow should not have any affect on the life of the engine. Large amounts of propane will increase the torque and place more strain on engine components. If this is kept within reasonable limits or only used for short durations, it should not have a significant affect on component life or the overall life of the engine.




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