Diesels will always smoke to a degree with current technology. Diesels always burn both rich and lean at the same time because they have diffusion burning not pre-mixed. The cooler fuel that is farther from the diffusion front and towards the end of the cycle is rich and has less dwell time to break down. Some of this stays as longer carbon chains of "stuff" and leaves the exhaust uncombusted. This is a waste of fuel - bad for your wallet and bad for the environment/your lungs.
As you increase the hp output per cubic inch on a diesel (i.e. the amount of fuel your are trying to burn in that space in a given time) the efficiency falls off pretty quick with more fuel heading out the exhaust and more heat into the cylinder walls. It actually falls down to near the efficiency of gas engines at high loads.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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