Re: My sister ask this question

Posted by Wayne on July 13, 2004 at 22:16:47 from (64.12.117.10):

In Reply to: My sister ask this question posted by buck on July 13, 2004 at 21:21:14:

The main reason I have always heard is to prevent engine and turbo wear. Everybody knows that the most wear to an engine occurs at startup when the engine is turning over with low to no oil pressure. So it stands to reason that the less you start it the less wear your gonna have. Then factor in that with a turbo your getting both a "dry" start and stop so the wear there is doubled. Thing is that the amount of wear that your gonna get on any engine, diesel or not during startup and shutdown is, all things considered, negligible at best. There are gonna be exceptions to that such as a route driver that, if he had to start and stop the engine at every stop would tend to get alot of additional wear most engines don't see. Not to mention he would lose way more profit in time spent with the starting/stopping of the engine that he does in fuel consumed by letting it run. Back to the wear issue though pulling into somewhere with the engine RPMs up then hitting the key at almost the same time you do the brakes is gonna leave that turbo spooling down from the high RPMs it turns with no oil pressure and that will kill one fast. In vehicles that can be a problem, but only if you don't use a little common sense and give it a few extra seconds to slow down before you shut the engine off. If you give it this time it's not gonna wear anymore than anything else. In my experience letting one set idling like this will kill it quicker than anything. Maybe the new computer controls help out some but usually an engine that sets and idles alot tends to get alot of carbon buildup because of the lower temps the engine runs at when it is under no load. I see this in equipment that is brought to a high RPM for a short time and then back down to an idle where it sets for a while before again going back to the high RPM again. Doing this over and over tends to shorten the lifespan considerably. The reason that makes the most sense to me in general terms is people do this is because diesel fuel is "cheap" so it doesn't cost them that much to keep the vehicle running with the A/C on in the summer, or the heater on in the winter....basically their spoiled..... Beyond that I don't have a clear answer other than they have heard from "somebody" that it's the best thing to do, or simply because they want to.... Just my .02

Follow Ups:

• Re: Re: My sister ask this question Mark - IN. 17:51:41 07/14/04 (0)

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