Re: DIESEL QUESTION

Posted by jdemaris on October 11, 2003 at 18:21:34 from (209.23.29.30):

In Reply to: DIESEL QUESTION posted by Allen on October 11, 2003 at 11:26:35:

I guess I'll have to dissent from the other opinions. Yes, a gas or diesel has a peak range of efficiency, and it's not at low idle speed. On the other hand, an engine that's well broken in and is in good enough condition to maintain adequate engine oil pressure at low speeds, will run fine at those low speeds. It might carbon up a bit, but that's about it. I won't bore you with countless stories and details, but I've known of diesels that were left idling for hours, sometimes days in extremely cold weather. Working the engine hard at low speeds, i.e. "lugging" is a different story, but I don't think that is what your were talking about.
My diesel truck, when new, spent all day and every day, idling while the driver sat inside with the heater on. This went on for six years. I've got it, it's 17 years old and has 260,000 miles on it. I drive it on the highway ( I don't sit around and idle much) and it runs fine. My neighbor has a John Deere 4020 tractor, around 100 horse, and the machine has spent countless hours over the past 35 plus years, idling and running a log splitter, often all day long. It has not suffered a bit. I'd venture to say a diesel probably runs a bit better at low speeds than a gas engine, this because the diesel gets proper fuel delivery at any speed and is not subject to the variations or inconsistent air-fuel ratios that occur with carburetors systems.
I suspect if your tractors skips a bit at low speed, it's caused by something specific, and not a general problem to be associated with diesels and "low speeds."

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