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Greetings,
With all these extremely hot temps I have been noticing the following using my Edge Engine Monitor:
1. Ambient Temp = 99 deg F (Overhead console reading)
2. TFT = 177 deg F (Tranny Fluid Temp)
3. EOT = 210 deg F (Engine Oil Temp)
When everything is up and running steady steady down the road my IAH temp = 2 to 4 deg below ambient temp.
However, when stopped at a red-light or whatever, the IAH temp will/has gone up to as much as 126 deg F.
So, I am curious to know if anyone has noticed this similar trend. I have not noticed this drastic of a change in the past but temps have not been this extreme either.
Does this indicate any problem or does it pose any danger to the engine?
IAT shouldn't be below ambient, but sometimes the little ambient sensor by the grill reads hotter than it should. A few degrees above ambient while cruising at highway speeds is no big deal.
EOT is fine, I've seen hotter, but then again, 99 isn't really that hot.
I'll skip the TFT questions. I've got a stick and don't pay any attention to that.
1. Ambient Temp = 99 deg F (Overhead console reading)
2. TFT = 177 deg F (Tranny Fluid Temp)
3. EOT = 210 deg F (Engine Oil Temp)
Normal
Originally Posted by lhud
When everything is up and running steady down the road my IAH temp = 2 to 4 deg below ambient temp.
Normal
Originally Posted by lhud
However, when stopped at a red-light or whatever, the IAH temp will/has gone up to as much as 126 deg F.
So, I am curious to know if anyone has noticed this similar trend. I have not noticed this drastic of a change in the past but temps have not been this extreme either.
When stopped, heat is no longer absorbed by the air moving. All that temperature of engine, transmission, Radiator, Transmission Cooler, Charge Air Cooler, Power Steering Cooler, along with the Turbo and Exhaust Manifold components basically hovers around the front of the vehicle until moving again, which also enters the Intake.
Here are upper limits of the fluids for out Trucks:
EOT 230*F (230*F Conventional / 240*F Full Synthetic)
ECT 220*F
*NOTE: The EOT and ECT should not be more that 15*F difference. And, the ECT should not match the EOT on deceleration. Either would be an indication of an oil cooler problem.*
TFT 180*F - 230*F Most people here say 150*F. The Workshop Manual states normal operating temperature to be 180*F. And, the upper limit 230*F)
EGT 1,250*F There is some debate as to what the actual number is. I personally will allow mine to get to 1,350 on a grade with a load. But, only for a brief period.
EGTs - According to everything I've researched, here is the rule: 1250 degrees for no longer than 2 minutes. You won't hurt anything in a race or WOT run to max speed at those temps, but a 10-mile grade over the line is likely to cause long-term damage.
My personal practice is to keep it away from 1250 degrees on extended runs, just in case my gauges/sensors/installation aren't precise.
As for those temp readings on the fluids, I had about the same readings on the day I took this picture (in the shade):
EGTs - According to everything I've researched, here is the rule: 1250 degrees for no longer than 2 minutes. You won't hurt anything in a race or WOT run to max speed at those temps, but a 10-mile grade over the line is likely to cause long-term damage.
I believe a lot of the ambiguity which I see as coming from probe placement and that I can't find anything that's "definitive". I'm even more surprised IH didn't do it when they developed the DIT Engine
I don't Tow much anymore. When I did it was 10k - 12k enclosed car/motorcycle trailers. I do have several Tow Tunes but use stock on grades of 6%. It defuels and cools much faster in stock than with the Tunes.
I have scoped the cylinders and find no evidence of flaw from 1,250. My probes are in the Exhaust Manifold at #7 & #8 about 2" down stream. But, I can't see major players like Piston Skirts. Although, the valves looked great @ 200k Mi.
It would be nice to see someone undertake a data compilation testing 1,100, 1,200, 1,300 and log the results. I don't see anyone doing that for a 16 y/o power plant..
Your trans temp is good. When you start hitting 190-200 it's time to start worrying. Above that is where damage starts happening.
According to Ron Sessions, author of the Turbo Hydra-Matic 350 Handbook (HP Books), the ideal operating temperature for transmission fluid is between 175 and 225 degrees Fahrenheit.
When everything is up and running steady steady down the road my IAH temp = 2 to 4 deg below ambient temp.
However, when stopped at a red-light or whatever, the IAH temp will/has gone up to as much as 126 deg F.
I've seen similar numbers in hot parts of the country. And corresponding lower temps in cooler places. And that's the kind of repeated observation that made me stop worrying about getting a cold air intake.
Now a bit of ram air from a zoodad, that I believe in. Always easy to believe in things with no observations to the contrary.
