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05-19-2007, 05:38 AM
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It depends, I don't know much about those 11.1 L detroits but I do know the 12.7L detroits like to idle around 1000 rpms.
Some engines are ok with a lower idle, like volvos. They're designed better so that they don't need a super high idle. Saves on fuel too.
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05-19-2007, 05:48 AM
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Could be just the smaller engines can handle the "slober" thats what our mechs. call it. We have a M 11 engine in a truck... it's the yard truck :lol:
It's got a bunk, low miles, nice paint, chrome package... 03 ? Yep the yard truck... No offence ment, but we need power...
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05-19-2007, 02:47 PM
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Yep...slobber is what Cat calls it too in the manual. Plus they say it causes carbon build up.
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05-21-2007, 12:00 PM
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quote="silvan"]
Quote:
Originally Posted by heavyhaulerss
1200 ???? man all i see is dollar signs going out the stack. lol.
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OTOH... At my old company, I just couldn't see running the engine this high at idle for the night, so I didn't. After a few months of this, it started drizzling oil out of the seams in the exhaust manifold, and my boss chewed my ass for not running it high enough at night.[/quote]
1000 is lots
the slober is NOT caused by idling under 1200, it's caused by running for long periods at low idle speed, more specifically; operating with a cold combustion chamber which causes incomplete combustion of fuel
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Bob H
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05-21-2007, 12:02 PM
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Quote:
Originally Posted by allan5oh
Some engines are ok with a lower idle, like volvos. They're designed better so that they don't need a super high idle. Saves on fuel too.
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?
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Bob H
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05-21-2007, 12:10 PM
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Quote:
Originally Posted by heavyhaulerss
well them i guess i'm just lucky then.. when i first bought my truck. i knew nothing about idleing. just that it said on engine not to idle lower than 600.. so i would idle at 6-1/2 700 tops. i have hit 1 mil miles about 4 months ago. never anything done to engine. nothing. still original injectors, e.t.c. still runs very good. 11.1 detroit. should i idle at 1000-1200 or keep it where i kept it for over 7 years now ?
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What temp does your engine run at while idling?
new(er) engines (first 100,000) are most susceptible to ring seating and cylinder glazing problems. destroyit diesel used to be the ones i saw the most issues with
OTN ; some guys will NEVER experience this problem... well, at least for now
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Bob H
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05-21-2007, 07:57 PM
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What I was getting at is two separate things on the Volvo:
1) The oil system is designed better, holds better pressure at lower rpms, and doesn't drop when the oil thins out(gets hot). For example, mine holds a steady 60 psi anywhere above 1000 rpms. Below that, even hot idle, doesn't drop below ~35ish.
2) The exhaust valve. It closes, creating a restriction in the exhaust, so that the engine has to work a little harder. This harder work creates a more complete burn.
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05-21-2007, 09:15 PM
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Quote:
Originally Posted by allan5oh
What I was getting at is two separate things on the Volvo:
1) The oil system is designed better, holds better pressure at lower rpms, and doesn't drop when the oil thins out(gets hot). For example, mine holds a steady 60 psi anywhere above 1000 rpms. Below that, even hot idle, doesn't drop below ~35ish.
2) The exhaust valve. It closes, creating a restriction in the exhaust, so that the engine has to work a little harder. This harder work creates a more complete burn.
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i forgot that you have a volvo engine... that exhaust brake WILL load the engine and improve cold weather idling temps. does it open/close automatically?
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05-21-2007, 10:45 PM
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It runs any time the engine is below 170 degrees. It doesn't care how cold it is out. It requires air to run. I guess it doesn't help with normal, at temperature idling. Cold weather performance on the volvos is far superior to any other engine I've ran.
They exhaust brake is also a problem on Volvos. The valve that controls the exhaust brake is $700, and the exhaust brake itself is $2000. I think both of mine need to be changed, they leak air. I might just to a rebuild.
Another thing, you cannot disable them. Well you can, but then you have to live with a code and no, I mean absolutely ZERO jake brake. I guess they did the jakes a little different from most manufacturers.
I have a completely open exhaust system, no baffles. I do have a muffler, but I'd hardly consider it that. Even with that setup, the jake is much quieter then other trucks with full-baffled mufflers.
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05-24-2007, 01:18 AM
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Quote:
Originally Posted by allan5oh
It runs any time the engine is below 170 degrees. It doesn't care how cold it is out. It requires air to run. I guess it doesn't help with normal, at temperature idling. Cold weather performance on the volvos is far superior to any other engine I've ran.
They exhaust brake is also a problem on Volvos. The valve that controls the exhaust brake is $700, and the exhaust brake itself is $2000. I think both of mine need to be changed, they leak air. I might just to a rebuild.
Another thing, you cannot disable them. Well you can, but then you have to live with a code and no, I mean absolutely ZERO jake brake. I guess they did the jakes a little different from most manufacturers.
I have a completely open exhaust system, no baffles. I do have a muffler, but I'd hardly consider it that. Even with that setup, the jake is much quieter then other trucks with full-baffled mufflers.
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yours is an exhaust brake. i would expect a butterfly or gate valve in the turbo down-pipe. most hd engine manufacturers use compression brakes... generally more power/noise
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Bob H
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