Quote:
Originally Posted by oldtamiyaphile
Although the mechanism differs from petrol, diesels main party trick is changing AFR to suit load conditions. A diesel can run 100:1 at idle and 14:1 under load. If diesels always ran lean, they wouldn't make smoke under heavy load - even the latest BMW will put out visible smoke if driven hard.
|
Sure, I see plenty of overpowered diesel pickups that smoke like trains, but that's because they've chipped them to make more power by adding fuel. But in a factory setup, it's difficult to make them smoke because they are designed to be clean. Volkswagens are some of the cleanest around. When I get mine emissions tested (at load), it regularly turns less than 6% opacity. They are designed to run lean of stoichiometric.