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Message |
Jim Shepherd (Rv_safetyman)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 03, 2006 - 12:39 am: | |
First some background. Today I made my last check-out trip before we head out on our maiden voyage to CA. I now have slightly over 600 miles on the engine/transmission swap and no real problems. I have made several trips up the big climb to our mountain community (about 20 miles of very steep highway). There have been no heating problems, although it is still in the 60's here. The AutoShift transmission functions very well. I have now built up some confidence (hopefully not false confidence).
Now for the question. When I was doing earlier testing, I had my Pro-Link hooked up and it looked like the temperature after the air to air (charge air cooler) reached well over 200 degrees F on a long hard pull. I have my own temperature sensor hooked up now and it seems to read about the same level under a long hard pull. The ambient temperature is around 60 degrees. The air to air is remote and cooled by two large electric fans.
I have looked in the manuals I have and they don’t seem to have a recommendation on the max temperature. I was wondering if anyone on the board has information of acceptable manifold air temperature.
Thanks
Jim Shepherd
Evergreen, CO
’85 Eagle 10
http://rvsafetysystems.com Toll Free: 1**888**349**0704
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rhbelter
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 03, 2006 - 1:37 am: | |
Ahoy, Jim,
For my Cummins M-11 in my -01 Eagle, the tech guys said 50 deg F above ambient is the limit.
I have digital thermometer themocouple probes for the turbo-out, and intake manifold-in. I've seen turbo-out temps approach 400 deg F at ~~30 lbs boost. My charge cooler is a bit smaller than it should be, but with my two speed cooling fan I'm able to stay below the delta 50 F limit when in high fan on long full power climbs. My charge cooler is mounted outside the radiator. My engine coolant temp is never a problem, but the inlet charge cooling is. My engine just drops power -- boost -- if inlet temps gets too high. I believe that it defends itself to avoid damage.
I'd suggest that you need more charge cooler fan power, or a larger charge cooler. The charge cooler BTU requirement surprisingly is not that far below the engine coolant BTU load.
BTW, My M-11 does NOT have an SAE J-1939 protocol capability, so no Autoshift for me with this engine, (but it WAS at one time mated to an Allison 4060 world transmission).
Enjoy/s/Bob |
Jim Shepherd (Rv_safetyman)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 13, 2006 - 6:58 pm: | |
HI Bob. This is a pretty old thread, so I will send this via email and also post it to the thread.
I had quite a bit of time to play with my air charge cooler and the temperature measurements on the way out to San Diego.
It now appears that I have two issues. I had hoped to have the fans draw in outside air and dump the heated air into the engine compartment. I has a concern that the huge radiator fan would "stall" the air flow from the smaller air to air fans. As a test, I reversed the leads to the fans and now have them drawing the air from the engine compartment. That seemed to make quite a difference, so the fans were fighting each other.
Now, I am stuck with drawing warm air (about 100 degree F air at perhaps 70 degree ambient -- not sure how much the engine compartment temperature rises on long pulls, as I did not switch the monitor over to that channel ) over the air to air. I think I am short of surface area now and the warm air situation is just going to make matters worse. I will start looking for a new air to air. I did look at Jim Stewart's Prevost and that air to air (for a Series 60) looks like it would work pretty well.
I will also jury rig a mister for the steep hills on the way home.
I have to wonder what the old two stroke air temperature is. The 6V92 turbo dumps into the blower (also a heat generator) and then into the engine. There may be a water to air cooler, but I don't recall reading about one. If there is no cooler, the temperatures of the incoming air must be very high.
Sorry to hear about the J1939 issue.
Jim |
Jon W.
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 14, 2006 - 7:41 am: | |
I had a water to air intercooler in my 8V92. |
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