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Re: What exactly makes a diesel smoke under a load
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Posted by H. Bowder on August 24, 2006 at 18:01:42 from (24.198.174.199):
In Reply to: What exactly makes a diesel smoke under a load posted by carpenter in belmont on August 24, 2006 at 16:43:51:
Smoke is a result of less-complete combustion. This means not enough air for the amount of fuel to be burned. A piston under load wants to slow down. The operator opens the throttle as a result. That increases the fuel flow and opens the butterfly valve for more air at the same time. Fuel volume is determined by the fuel pump pressure. Air intake volume is determined by atmospheric pressure (14.7 psi if I remember correctly). While the fuel pump can happily inject all the fuel the throttle asks for, the atmosphere can only supply as much air as the piston will pull in; no matter how much the throttle opens the butterfly valve. And a slower-moving piston under load draws in less air (per unit of time). Resulting in less air for the amount of fuel in the piston, resulting in less complete combustion, resulting in smoke. That is why, incidentally, turbo diesels have more power. They pump air into the piston at pressures above atmospheric pressure and produce more concentrated combustible material. If you can concentrate twice the fuel AND twice the air in a piston you get twice the power forcing the piston down -or thereabouts.
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