Another reason reported is "difficulty in restarting when cold". One big reason is for warmth (or A/C if in the summer) all night while sleeping in the sleeper berth. Yes, its true, all sorts of big rig operators idle their trucks for long periods. It would be even better than that if the EPA didn't require such a high idle speed.Ĭlick to expand.In the early '90s I worked for the Maintenance Council of the American Trucking Associations and we analyzed this. I figure a gallon of fuel will idle my car's engine for at least 12 hours. And for the thermal cycling reasons set forth above, it is just better.Ĥ. Keeps the compression up and the ring pack clean.ģ. Steady state rpms are a problem, but the "Italian tuneup" is a good thing for these cars. OK, ok, if you idled it for 20 or 30 hours, then maybe you'd start to get a little buildup on the ring pack, but for the same reason as you'd do it at any other time, a bit of high rpm exercise will blow it right off. No excess soot is developed dirty deposits won't build up. In a diesel, idling at perhaps upward of a 100:1 ratio, each fuel droplet burns as soon as it reaches combustion temperature, and with the surfeit of oxygen available, it burns very well, thank you very much. In a spark ignition engine (gas car), this would result in no combustion. Yet, only a tiny idle quantity of fuel needs to be injected. Without a throttle butterfly, maximum air is taken in on each intake stroke. At least, that is how it used to be, prior to today's lean-burn cycles and port fuel injected engines.ĭiesel engines idle at extreme lean cycles. Carbon builds up as the fuel is not burned nearly so efficiently. In a gas engine, idling happens at a rich state. The claimed clogging problems during idling simply do not apply in nearly the magnitude for a diesel as they do for a gas engine. Have you priced a starter motor for these things?Ģ. I idle mine whenever possible for things like filling with fuel, stopping while I go in and open the shop door before I drvie it inside to park, short stop to talk to someone or drop something off that won't take more than a few minutes, checking my P.O.
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