Wednesday, Jun 22, 2005 at 06:23
Hi F4Phantom
From my various readings of other sites, the economy is achieved by almost total consumption of the diesel fuel in the combustion chamber.
The gas charge creates a burn of over 99% of the diesel fuel in the combustion chamber, rather that the standard 85%. This them gives either more power, or with the foot lifted slightly, the same power out put for a lesser input of diesel fuel, therefore creating a diesel saving. the gas is injected into the inlet airflow at a variable ratio of between 10% and 25% of the total fuel used, IE if you use 10kilos of diesel per hour, between 1 and 2.5kilos of gas is injected into the airflow, depending on engine speed, and torque band. The computer controller has to be set with torque band settings for each engine. As the ignition point of the diesel fuel charge is about 385 deg c, and the flash point of the propane/butane charge is about 550 deg c, the gas is compressed in the cylinder with the air mixture, but doesn’t ignite on its own. When the diesel fuel is injected, this triggers the ignition of the gas charge, which in turn promoted an almost total burn of the diesel fuel where it can best be used. As a side benefit, because there is almost total consumption of the diesel fuel, you get little or no carbon particulate matter (soot) out of the exhaust pipe, which keeps the enviromentals happy too.
This is the way I read and understand the subject.
Nick.
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