idle time vs. combustion temp
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Laughing Gas
Joined: Apr 2012
Posts: 902
Likes: 51
From: Clark, WY
idle time vs. combustion temp
What are the current thoughts on idle RMP needed to keep proper combustion temps with the coolant cooled/heated intercooler?
With the air to air intercoolers worrying about intake air temp was a valid concern. We would just idle up to use more fuel to create the added heat to the entire system that was required. As the 6.7 powerstroke has coolant going through the intercooler, it also heats the air if the air is colder than the water temp.
Last winter I sleep on the side of the highway during blizzard conditions, had the truck idle at 1200ish, slept more than usual plus wanted to wait for daylight because of the conditions. Used a lot of fuel, wondering if a lower RPM would have sufficed. Also, I kept an eye on the oil temp but wondering if another temp reading would give a better analog of combustion temp.
With the air to air intercoolers worrying about intake air temp was a valid concern. We would just idle up to use more fuel to create the added heat to the entire system that was required. As the 6.7 powerstroke has coolant going through the intercooler, it also heats the air if the air is colder than the water temp.
Last winter I sleep on the side of the highway during blizzard conditions, had the truck idle at 1200ish, slept more than usual plus wanted to wait for daylight because of the conditions. Used a lot of fuel, wondering if a lower RPM would have sufficed. Also, I kept an eye on the oil temp but wondering if another temp reading would give a better analog of combustion temp.
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Laughing Gas
Joined: Apr 2012
Posts: 902
Likes: 51
From: Clark, WY
Not saying the fuel usage was abnormal for situation. Wondering if I can run a lower RPM during long idle times (and thereby save some fuel in those situations).
Logistics Pro
Joined: May 2022
Posts: 4,293
Likes: 2,416
From: Everywhere and nowhere
On a pre-DEF equipped diesel you could idle them for years and never have a problem but on the newer ones if you just idle them at the factory idle I would be worried about clogging the DPF. The high idle on the old Cat and Detroit diesels I drove was 1500RPM but those also had PTO units and that may have played a part in why they high idled at that particular RPM. We used to high idle those all day and they wouldn't even burn 10 gallons of fuel.
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Laughing Gas
Joined: Apr 2012
Posts: 902
Likes: 51
From: Clark, WY
I asssure you wetstacking and the buildup from it pre-dates current emissions equipment. I can see how incomplete combustion, right up to wetstacking, would cause problems for the DPF. Keeping up the combustion temp, therefore having a complete burn, is a good thing for any diesel engine.
Cargo Master
Joined: Oct 2011
Posts: 2,887
Likes: 778
From: SoCal/Wyoming
After spending a day on I-80 between Rock Springs and Rawlins many years ago, I added a 91 gallon auxiliary tank on my 2002 F-250. I would plan on leaving the idle around 1100-1200rpm on these newer trucks and plan on either carrying additional fuel or making sure you fuel sooner than usual in inclement weather.
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Laughing Gas
Joined: Apr 2012
Posts: 902
Likes: 51
From: Clark, WY
I can carry 123 useable gallons, and thinking about upgrading my main tank to bring it to 143 gallons. Trending Topics
Mountain Pass
Joined: Dec 2017
Posts: 143
Likes: 54
From: Kalispell, MT
My '17 was put on a diet years ago. However, 900 RPM seems to keep everything pretty toasty in the winter unless temps start dipping below zero. At that point, I'll bump it up to 1100.
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Laughing Gas
Joined: Apr 2012
Posts: 902
Likes: 51
From: Clark, WY
There are factory wires you use, behind the passenger kick panel, that you wire with 12v signal and either a resistor or viable resistor. Or, aftermarket companies make kits if you are wiring imparied.
Ford issues "builder's guide" for every model, that explains what the wires are used for. I'm sure a search will reveal the one that should be used in '24.
Ford issues "builder's guide" for every model, that explains what the wires are used for. I'm sure a search will reveal the one that should be used in '24.
Cargo Master
Joined: Mar 2021
Posts: 2,044
Likes: 1,336
on my 2023 I used a high idle switch from BD Diesel
put the park brake on and adjust the dial anywhere from like 900-3000rpm as desired
im usually around 1000-1200 depending on what I’m doing
put the park brake on and adjust the dial anywhere from like 900-3000rpm as desired
im usually around 1000-1200 depending on what I’m doing
Mountain Pass
Joined: Dec 2017
Posts: 143
Likes: 54
From: Kalispell, MT
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