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Old 05-06-2016, 04:15 PM   #43
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Engine hours divided into odometer miles.
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Old 05-06-2016, 05:24 PM   #44
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Prolonged idle, especially at very low idle speeds, results in less "sling" of oil from the crankshaft throws to the upper cylinder walls, which means reduced upper cylinder lubrication. Some engine operating manuals specifically warn about this.
Some industrial engines which are expected to run low RPM for long periods have specially drilled/aimed oiling jets which spray oil into the upper cylinder areas. This doesn't work well in engines which run high RPM frequently because then, those engines receive too much oil which floods and sticks piston rings.
The pursuit engines (a-la law enforcement which also must accept long periods idling) often have an additional oil-control ring on their pistons to take care of the high-speed overlube problem.
Hope this answer helps.
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Old 05-06-2016, 08:24 PM   #45
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Well leaving Houston today in rush hour traffic I experienced PRLOOOOOONGED idling. I guess she is done for
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Old 05-06-2016, 08:57 PM   #46
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Originally Posted by Boxite View Post
Prolonged idle, especially at very low idle speeds, results in less "sling" of oil from the crankshaft throws to the upper cylinder walls, which means reduced upper cylinder lubrication. Some engine operating manuals specifically warn about this.
Some industrial engines which are expected to run low RPM for long periods have specially drilled/aimed oiling jets which spray oil into the upper cylinder areas. This doesn't work well in engines which run high RPM frequently because then, those engines receive too much oil which floods and sticks piston rings.
The pursuit engines (a-la law enforcement which also must accept long periods idling) often have an additional oil-control ring on their pistons to take care of the high-speed overlube problem.
Hope this answer helps.
When you say law-enf. cars, are you talking about diesel, or all engines? I started this thread for the Sprinter V6 Bluetech one, and I had never seen police Sprinters ))).

If you are talking about gasoline engines - they are not negatively affected by prolong idling.

Also, after a lot of Internet researches, I would say IMHO that an hour of idling would not harm our V6 Bluetech if that idling is in a stop between prolonged highway runs.
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Old 05-06-2016, 08:58 PM   #47
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Well leaving Houston today in rush hour traffic I experienced PRLOOOOOONGED idling. I guess she is done for
No worries!
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Old 05-06-2016, 10:42 PM   #48
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When you say law-enf. cars, are you talking about diesel, or all engines? I started this thread for the Sprinter V6 Bluetech one, and I had never seen police Sprinters ))).

If you are talking about gasoline engines - they are not negatively affected by prolong idling.

Also, after a lot of Internet researches, I would say IMHO that an hour of idling would not harm our V6 Bluetech if that idling is in a stop between prolonged highway runs.
I was indeed specifically referring to gasoline engines. My Continental has a direct warning against it in the Operators Manual and specifically states that upper cylinder damage can result.
As a new car dealer mechanic back in the early '70s I personally worked on the Houston Police Dept fleet as a subcontracted dealer (they had their own motor-pool shops but subcontracted out fleet warranty-repairs) and that is how I learned of the different piston-ring provisions in what the manuals called "pursuit" engines.
I'm not looking for an argument with anyone but most operators manuals I've read have specifically reduced service intervals for engines which experience long periods of idling. I wonder why they require increased service if it's not "negatively affected"?
The reason I posted was not in response to your original post on diesels... but in response to another's post regarding valves increased wear due to idling and thought it might be of interest to know about upper cylinder issues.
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Old 05-07-2016, 01:08 AM   #49
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For decades, I am changing oil in all my high-end gasoline cars every 5 thousand miles with the highest quality synthetic, and I idle them for hours with no negative effect indeed.

Diesel, especially Bluetech is kinda different...
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Old 05-07-2016, 02:48 PM   #50
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It isn't that an hour here or there will make or break. It IS the percentage of idle time to run time. Ford, I believe, breaks this out on the dash panel. Otherwise, the average mph is the thing to watch.
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Old 05-07-2016, 04:14 PM   #51
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It isn't that an hour here or there will make or break. It IS the percentage of idle time to run time. Ford, I believe, breaks this out on the dash panel. Otherwise, the average mph is the thing to watch.
And what for the SLOW-MOVER's ))) opinion a normal operation of the vehicle's average MPH is good for the engine?
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