What the best APU
Discussion in 'Trucks [ Eighteen Wheelers ]' started by JPK, Mar 30, 2011.
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Buy your filters for a TriPac from ThermoKing, that way you can go the full 1000 hours between services, but get your service done someplace else and save a ton of money.
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Not trying to bash anyone just never thought much about it. If I run otr I would have one for the comfort and not havine to worrie about the idle police. -
If I take the head off your motor I can tell if you idle the main motor a lot, the cylinder will have a brown haze to it, there will be polished streaks up the wall, from carbon building up on the side of the piston, and when you drive off the piston grows to its proper shape it polishes the liner.
The rings on the piston will not be stuck but not free like they should be.
The oil rings wear a lot more on an engine that is idled a lot because the carbon gets on the liner and wears the rings.
The exhaust manifold and turbo get a carbon build up on then, like a wavy ripple that is very restrictive.
Fast idle does not help a great deal, and if you call Cummins they will tell you the engine at above idle burns more than 1.5 gallons an hour.
Fuel gets into the crank case and because it condenses on the cylinder, from incomplete combustion and acidifies the oil.
There is nothing positive about idling any engine.
And most bigger companies figure the payback of the APU at less than 2 years. It also cuts way back on the truck batteries going bad from heavy charge cycling. -
Real world is more like 2000 idel hours a year with a savings of .9 gallons an hour at $4 per gallon that is $7200. -
Just from what my Volvo was saying on the dash display and the numbers that were posted for a apu. Which is only .25 and hour differance. Like I was saying I dont run otr so never looked very deep at the numbers. -
Almost all trucks idle between 1.0-1.3 gallons per hour. APUs can idle anywhere from .1gph (low RPM 1-cylinder APU) - .25gph (high RPM 3-cylinder). The average for an APU is general .18-.22.
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I bumped into a video on Youtube that shows Forest Lucas of Lucas Oil making strong recommendation for Dynasys APU's based on testing of several other units. I guess his recommendation is about as good as anybody elses, depending on your perspective. Still haven't been able to justify a purchase yet, but there are number of factors that are swaying me toward the Dynasys unit. Mainly the unit design and less frame rail space compared to Tripac, Carrier, and similar units. That is an issue with my truck. And since a very reputable dealer is about 40 miles from my house (I have used that shop for several truck repairs in the past) and OOIDA has a deal going with them for $300 off the price, I am being pushed in that direction.
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