Low EGT's in Cold Weather?

[Briar Hopper]

On my way to work tonight, (2 lane country road) I got stuck behind 3 slow trucks going 50, so I reached down and tickled the 'ol PowerEdge into level 3 and dropped the hammer, only lifting to save the clutch. It took off like a gunshot, like always, with one difference, the EGT's didn't go past 1000 ! I've never had them stay that low with level 3 before, they usually hit 1500 easily, very quickly, in warm weather. Cold weather? It was about 10 degrees, and the engine was fully warm, with a wintershield in front of the radiator. I haven't had it in level 3 for weeks, partly to save the clutch, partly because of EGT's .

 

[Mopar-muscle]

i've noticed lo EGT also , to lo i feel and if you ask me i believe part of the reason for the drop in MPG during the winter . i usually run in the 650 - 700 range when on the highway at 70 - 75 , was running 550 last nite , 27 degrees out .

 

[illflem]

I think the winter 1&2 blend fuel has more to do with lower EGTs than the outside temperature. #1 has less BTUs=less heat. I've installed than intake air temp gauge and have been doing experiments,haven't been able to change the EGTs at all with higher intake air temps. If you think about it for your EGTs to drop 100°,the outside temp would also have to drop 100°if colder air was the reason,don't think that many of us in the lower 48 see that happen to often.

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95' 25004X4,AT,Driftwood,Banks Stinger,Warn fender flairs and running boards(Play truck)95 3500,5 speed,Driftwood,Banks&Phscotty,34,000 GCVW apple and tractor hauler(work truck)

 

[JR2]

I would have to agree that the outside temp has little to do with egt readings. I recently pulled my snowmachine tralier over 350 miles in temps ranging from 10 to -10 F. I saw no difference in egt's from my summer driving.

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John D. Rathert Jr.
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01 2500 SLT+ QC LWB 4x4 Auto 3. 54 rear end, Forrest Green Sport with all options avail DC Nerf Bars, DC Grill Gard, DC mud flaps, Line-X bed liner, Leer 160XL Topper, Power Edge, EZ Edge, SPA Boost/EGT Gauge on pillar mount, DDT's torque converter - valve body combo and 275 injectors.
4" Exhaust on deck. Air box mods and a new turbo in planning stages.

See My Truck

Dads truck: 98. 5 3500 SLT QC LWB 4x4
Brother Truck: 92 W250 SLT CC LWB 4x4 (Dads old truck)

See 5 Diesels and a Gasser
Winter fun: 2000 Skidoo Summit 700

 

[Chad Sheets]

Sorry guys. The EGT's are down because the intake air temps are down. Get you a couple 5 gallon cans and store some winter blend fuel for the summer. When you start noticing the EGT's rising again, run the tank as empty as you can, then fill up with your winter blend. You will be hard presed to see a change in EGT's. Its all about intake temps.

Also for EGT to decrease by 100 degrees, the intake air only has to decrease by about 30.

Didnt we just go over all this in the airbox thread?

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Always ready to help!
2000 2500 Red Sport quad cab, 4x4, K&N, DDI's, straight piped, boost, pyro and fuel pressure gages, Hot Power Edge, mean looking set of 33. 5" tires, Snap On diamond tool box, Marine Corps window sticker, Semper Fi!

1972 340 Cuda'. Original tripple Black, 340 car w/air. Good clean car, super stock springs, Weld Prostars, shaker hood, strong 340 with a 727/4000 stahl, 4. 56... . Bombs away!
NRA Life Member. http://www.geocities.com/chadsheets

[This message has been edited by Chad Sheets (edited 12-22-2000). ]

 

[illflem]

Sorry Chad but since I started monitoring my intake temps I haven't been able to change my EGTs by more than about 100° by varying the intake temp. This is on flat ground cruise at 60 mph. 30°has been the lowest intake temp(0° ambient nothing blocked),122° the highest(46°with everything blocked,drawing air from under the hood). I do admit that the truck feels stronger at higher intake temps,but the EGTs aren't changing much. With your formula the EGTs should be varying 400°. My EGTs have been 600-700°.

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95' 25004X4,AT,Driftwood,Banks Stinger,Warn fender flairs and running boards(Play truck)95 3500,5 speed,Driftwood,Banks&Phscotty,34,000 GCVW apple and tractor hauler(work truck)

 

[JJW_ND]

Actually my EGTs have risen with the cold temps. I know their have been days that have been at or above 100 degrees colder (ambient temp under hood) thus the probe is measuring an additional 100 degrees from ambient to the 250 - 300 actual EGT temp.

Seems the Westachs are calibrated at 75 - 80 degrees.

It has been a long time since I read that info that came with the probe.

jjw
ND

 

[Briar Hopper]

I don't see how it can be the fuel, I'm with Chad on this one. I'm running Stanadyne Performance additive, which gives the cetane a kick in the rear, and my miles-per-gallon is actually over what I was running in the summer, without the additive.
Stanadyne is awesome. diesel Viagra, anyone? #ad


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Tom
GLTDR B. A. D. Boys
www.lubedealers.com/meers.html

 

[Bigsaint]

I'm also with Chad on this one. My EGT's are lower when it's colder. The pumps I use switched over to winter blend and my MPG's went down and my EGT's stayed the same in the milder weather. I just put my first dose of Stanadyne Performance additive in tonight (4 degrees outside at 2300 hrs. )and I'm hoping to get the same results as Briar Hopper.

Scott W.


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White 2001. 5 3500 ETH/DEE 4X4 Quad cab SLT,tow package and camper prep,Husky liners front and rear,DiPricol pyro and boost and engine oil temp. gauges,Mopar tonneau,Lund bug shield,PM tractor utility back up lights,Penda bed mat,Edge EZ box and blow by bottle is bye bye !!!
My Truck

[This message has been edited by Bigsaint (edited 12-23-2000). ]

 

[Chad Sheets]

Like I said, bottle some "winter fuel" up for this summer and see what happens.

Unhook your intake air heater and see if those temps change. Since it kicks on at 60 deg, it is adding heat into the intake air temps. Is it warming the air to 60 deg all the time? No way. Its like the furnace in your house set on 60 and the front door is open letting 30 deg air in. The actual air temp in that house isnt going to be 30, or 60. Something in between. So you cant say that opening the front door to your house has minimal effect on heat loss/gain, because it does. There are just other things to consider, that are not being considered.

As for the 20 deg = 60 deg formula. I would like to take credit for that, but truth is it was decided and proven and reproven before I ever knew what a diesel was. Its pretty much the norm in the diesel industry, sea to shining sea.

[This message has been edited by Chad Sheets (edited 12-23-2000). ]