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Re: Diesel opacity tests for road vehicles
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Posted by Bob on September 23, 2006 at 11:25:56 from (69.178.229.154):
In Reply to: Re: Diesel opacity tests for road vehicles posted by KEB on September 23, 2006 at 11:02:59:
Keith... Please explain to me how TURNING DOWN THE PUMP will affect the smoke, at simulated highway speeds of 40 and 60 MPH???? The pump adjustment controls the MAX amount of fuel injected with the pedal to the floor, and would have NO EFFECT on the fuel rate at less than WOT. Some common reasons for excess smoke from a 6.2: Bad injectors Late injection timing from wear in the timing chain and gears and/or a worn advance piston
and bore. SLIGHTLY advancing the pump static timing MAY help. In the last several months, I have replaced the timing sets on 2 high-mileage 6.2's, and it's unbelievable how much better and CLEANER they run. Even the crankcase oil may affect smoke, 'cause some of it gets sucked into the intake and burned, along with blowby. On one of the GM diesel boards, this was mentioned, and a suggestion was made as to a good oil choice for better results at the testing station, but I can't recall where I saw that!
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