Re: Why leave Diesel's run?

Posted by JD790 on April 13, 2001 at 22:35:30 from (12.73.182.175):

In Reply to: Why leave Diesel's run? posted by Dezel Dummy on April 11, 2001 at 02:11:25:

Your questions are not dumb! They are age old.
and technology continues to try to please the driver, owners, companys that use trucks.
Detroit Diesel and most engine Manufacturers consider anything over 17% excessive for Idle.
I was asked several times to check a Cat, Cummins, Detroit or Navistar engine for poor fuel economy. Most the time the fleet operation managers would have a fit when they found out the idle time was in the range of 28%. Thus a drop in recorded fuel mileage. This is the reason many trucks have auto shutdown if idle. These are adjustable perameters
However many over the road drivers use there trucks with heat and A/C. The idle is bumped higher to be more efficiant. It is absolutely neccesary to run them In extreme temp.
Another interesting feature is for example a navistar engine built after 1999 has the ability if left idling to ramp up to 1400 rpm if the outside air temp is below freezing and the coolant temp is coolant temp is less than 120 degrees. It will stay ramped up till the coolant temp exceeds 140 degrees then will return to normal. This feature is usefull in Alaska and Northern Canada where consistent extreme cold prevails in winter. The reason? Reduces deposits and a tarnish that can build up from excessive idling at very cool engine temps.
For you Ford Powerstroke Fans? They experienced push tubes seizing and bending after a restart in extreme cold after episodes of long extended cold winter idling.
Just a few examples here. Are you sorry you asked?

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