Re: What exactly makes a diesel smoke under a load

Posted by jdemaris on August 25, 2006 at 07:19:12 from (66.218.17.185):

In Reply to: Re: What exactly makes a diesel smoke under a load posted by RAB on August 25, 2006 at 01:28:59:

I think I disagree with a few of your comments, but perhaps the problem is semantics. First, there is a simple, albeit, general answer. A diesel smokes when more fuel is being injected than can be efficiently used at the time.
Also, you mention the early DI engines with swirl-chambers in the pistons smoking under all loads. As I mentioned earler, I've worked on some very simple diesel engines, with DI and combustion chambers in the piston tops, that hardly smoked at all - one example being the Yanmar diesels that Deere used in the 70s. Yanmar was just more careful with their design and quality control.
You mention tractor and engine designs being a compromise - which of course is true. But, it seems that some companies compromised more than others - and those that did it the most - by generalizing parts applications, and using very loose plus and minus assembly tolerances - often had the dirtiest running engines.
The guy that asked the question about diesels smoking under load - I assume - was referring to the older, simpler diesel systems - and not new systems - that tend NOT to smoke.

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