Facts about diesel ideling

trailerbikecamper wrote:
The first myth about idling for warm up time is in direct contravention of my owners manual. My manula states that, the vehicle should not be driven at higher than 1200 RPM until the engine reaches normal operating temperature.

Beside the fact that this article seems to be geared toward the commercial trucking industry, not the personal owner.

If I did that, I couldn't have driven my F-350s...because they WOULDN'T reach normal temperature unless driven over 1200RPM!

avvidclif1 wrote:
You forget one thing about idling big rigs in cold weather. When the temps drop below low teens and especially below zero that oil gets very thick when the engine is off. Park in a truck stop in 0 degrees weather and shut it down and you probably can't start it the next morning. It flat will not turn over. It may not be warm the next morning but it at least will be running.

Then fix your truck. I have fired my work truck in cold temperatures many times without a problem!

Hannibal wrote:

Cummins12V98 wrote:

Hannibal wrote:
With my four Cummins powered Rams and their properly located post turbo pyrometers, driving around town seldom required more than a minute idle time to safe shutdown temp. While towing, by the time I coasted into a rest area or down an off ramp to get fuel, I was already at a safe temp before coming to a stop. In the campgrounds, less than a minute or two at the most.
Even back in the previous century, Cummins recommended not idling for extended periods as it can cause cold combustion and cylinder washdown, stuck rings and clogged injectors. Truckers let them idle to keep themselves warm at night, not the engine.
My diesel pickups were no more of a big rig then than my 5.4L F250 is now. Not even with the towing mirrors out when I'm not towing anything is it a big rig. No need to pretend it is.
Now if I could add a compressor and solenoid to sound like air brakes when I come to a stop, that would be a whole different story! :B

Post turbo properly located? I and many on the TDR would disagree with that. Post turbo is too slow to respond to what is happening.

Buy a 3pc exhaust manifold where is it tapped for the probe?

Properly located according to Cummins. The exhaust elbows on my four Cummins was bolstered and dimpled specifically for drilling and installing a probe. I have the first issue of TDR. I was a member when it was a mailing list registry before the first issue. The proper location to monitor for shut down temps is post turbo. The turbo is a heat sink and can stay hot longer than exhaust gasses pre turbo. Pre turbo is for monitoring exhaust gasses in modified engines to prevent overtemp of combustion chambers. It may be more entertaining pre turbo and necessary for bombed diesels but, it's not reliable for shut down temps.

Only real reason anyone would have added a pyro to the older Cummins is because they were bombed! The engines were so detuned they could not be hurt. When you are pouring the coal to it you want to know your temps NOW.

Been a member there since 01 and my Dad an original member was the first to claim "I am my own warranty station" !

I guess we will disagree.

Well there's about a zillion diesel owners driving around with no gauges, turning their trucks off all Willy nilly and they're not cooking turbos every day.
Makes sense after a hard pull to not immediately shut down. 9of 10 times you're cool enough by the time you pull off the road.
Let's not make too much about it. 1min cool down after driving around town? Really.
Turn it on, turn it off, it will be fine.
Only time I see egts stay over 400 (pre turbo) for more than maybe a minute is if I'm hauling heavy and hauling @ss up hill in the summer and stop within less than a minute of stomping the skinny pedal.

goducks10 wrote:

trailerbikecamper wrote:
The first myth about idling for warm up time is in direct contravention of my owners manual. My manula states that, the vehicle should not be driven at higher than 1200 RPM until the engine reaches normal operating temperature.

Beside the fact that this article seems to be geared toward the commercial trucking industry, not the personal owner.

I couldn't drive down the neighborhood street if that was the case.

This is exactly my point. The truck is supposed to idle until it reaches normal operating temp to prevent danage.

Sport45 wrote:

trailerbikecamper wrote:
The first myth about idling for warm up time is in direct contravention of my owners manual. My manula states that, the vehicle should not be driven at higher than 1200 RPM until the engine reaches normal operating temperature.

Beside the fact that this article seems to be geared toward the commercial trucking industry, not the personal owner.

If you don't mind my asking, what vehicle are you referring too? I haven't found a rpm limit in any of my owners manuals for driving before reaching full operating temperature.

This on my '03 CTD 2500. Not a large commercial vehicle by any stretch of th eimagination.

DutchmenSport wrote:
I have found with my truck (3500 diesel)

What year is your truck?

It looks like a GM, correct?

Cummins12V98 wrote:

Hannibal wrote:
With my four Cummins powered Rams and their properly located post turbo pyrometers, driving around town seldom required more than a minute idle time to safe shutdown temp. While towing, by the time I coasted into a rest area or down an off ramp to get fuel, I was already at a safe temp before coming to a stop. In the campgrounds, less than a minute or two at the most.
Even back in the previous century, Cummins recommended not idling for extended periods as it can cause cold combustion and cylinder washdown, stuck rings and clogged injectors. Truckers let them idle to keep themselves warm at night, not the engine.
My diesel pickups were no more of a big rig then than my 5.4L F250 is now. Not even with the towing mirrors out when I'm not towing anything is it a big rig. No need to pretend it is.
Now if I could add a compressor and solenoid to sound like air brakes when I come to a stop, that would be a whole different story! :B

Post turbo properly located? I and many on the TDR would disagree with that. Post turbo is too slow to respond to what is happening.

Buy a 3pc exhaust manifold where is it tapped for the probe?

Properly located according to Cummins. The exhaust elbows on my four Cummins was bolstered and dimpled specifically for drilling and installing a probe. I have the first issue of TDR. I was a member when it was a mailing list registry before the first issue. The proper location to monitor for shut down temps is post turbo. The turbo is a heat sink and can stay hot longer than exhaust gasses pre turbo. Pre turbo is for monitoring exhaust gasses in modified engines to prevent overtemp of combustion chambers. It may be more entertaining pre turbo and necessary for bombed diesels but, it's not reliable for shut down temps.

Hannibal wrote:
With my four Cummins powered Rams and their properly located post turbo pyrometers, driving around town seldom required more than a minute idle time to safe shutdown temp. While towing, by the time I coasted into a rest area or down an off ramp to get fuel, I was already at a safe temp before coming to a stop. In the campgrounds, less than a minute or two at the most.
Even back in the previous century, Cummins recommended not idling for extended periods as it can cause cold combustion and cylinder washdown, stuck rings and clogged injectors. Truckers let them idle to keep themselves warm at night, not the engine.
My diesel pickups were no more of a big rig then than my 5.4L F250 is now. Not even with the towing mirrors out when I'm not towing anything is it a big rig. No need to pretend it is.
Now if I could add a compressor and solenoid to sound like air brakes when I come to a stop, that would be a whole different story! :B

Post turbo properly located? I and many on the TDR would disagree with that. Post turbo is too slow to respond to what is happening.

Buy a 3pc exhaust manifold where is it tapped for the probe?

With my four Cummins powered Rams and their properly located post turbo pyrometers, driving around town seldom required more than a minute idle time to safe shutdown temp. While towing, by the time I coasted into a rest area or down an off ramp to get fuel, I was already at a safe temp before coming to a stop. In the campgrounds, less than a minute or two at the most.
Even back in the previous century, Cummins recommended not idling for extended periods as it can cause cold combustion and cylinder washdown, stuck rings and clogged injectors. Truckers let them idle to keep themselves warm at night, not the engine.
My diesel pickups were no more of a big rig then than my 5.4L F250 is now. Not even with the towing mirrors out when I'm not towing anything is it a big rig. No need to pretend it is.
Now if I could add a compressor and solenoid to sound like air brakes when I come to a stop, that would be a whole different story! :B