| Author |
Message |
Laryn Christley (Barn_owl)
Registered Member
Username: Barn_owl
Post Number: 82
Registered: 10-2006
Posted From: 153.2.247.33
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, September 26, 2007 - 9:33 pm: | |
I took a trip up to Lake Moomaw last weekend and I pulled some very steep, long hills on the way. My sort weekend trips are spent mostly here in the Appalachian Mountains and my bus sees many slow climbs in first gear not locked up. I try to keep the v730 in lockup as long as I can but when the hills are this steep it just drops out and I am left creeping up the grade. The transmission has an oil/coolant heat exchanger and fortunately, the PO increased the radiator size from the stock four core to a seven core. If my gauge is correct I have never had the coolant over 200 degrees. The engine coolant line from my heat exchanger (hot side) using an IR thermometer gets a reading of about 198 degrees. When I take a temperature reading from the oil outlet on the transmission after one of those hard pulls, I have seen readings of 240 degrees. I know those temperatures are way up there and that has led to some questions.
1. How close is the IR reading to the actual oil temperature? Would it be close to a transmission gauge? I am going to put a transmission gauge on the dash in the near future. I just want to know if I am in the ballpark when I read it from my gun.
2. Would putting an air cooler ahead of the other cooler help? I know many owners do it to help keep from dumping the extra heat into the cooling system but I am not having that problem (but I still don’t like dumping a lot of heat into the engine). Another option would be to put it after and use a thermostat to control the fan. How would you all do it? I don’t want to spend the money if I wouldn’t get much of a return on the actual transmission oil cooling.
3. What temperature readings are you all getting?
I have the transmission oil tested once a year and so far, it has been ok. I know lower temperatures would benefit the oil and transmission by extending the service life. I just don’t want to throw money at it.
Thanks,
Laryn |
Bill Gerrie (Bill_gerrie)
Registered Member
Username: Bill_gerrie
Post Number: 116
Registered: 3-2006
Posted From: 67.77.32.90
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 01, 2007 - 10:36 pm: | |
Laryn
My V731 is running at 240 degrees after a couple of hours at high speed. Your IR gun is acurate. I run an air type of cooler after the rad as I didn't want to add extra heat into the system as well. It is 60% effective in this position so I used a larger then required one. It is a Hayden 2305. The only thing I find is the tranny takes a long time to warm up when cold. I don't like the 240 degrees but it doesn't seem to bother it. No burnt smell etc. It is a good idea to have a gauge in the oil and I would put it in the sump. I have two. One in the sump and one in the convertor out line. Always try to keep the tranny locked up as it doesn't produce as much heat. I am on a trip in AZ now but when I return home I want to try and get the tranny to run cooler. Haven't figured out how yet.
Bill |
Laryn Christley (Barn_owl)
Registered Member
Username: Barn_owl
Post Number: 83
Registered: 10-2006
Posted From: 71.254.47.37
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 01, 2007 - 11:14 pm: | |
Bill,
Thanks for posting. It seems that there is not much real world experience to draw on out there, not many have responded to my post on either board. I am going to do a few oil analyses over time and if it calls for an oil change then go through another cycle to see if it is feasible to spend the money on an additional cooler. If the change intervals are long and extended then I will just replace the oil. At this time I still have the oil in it that came with it. So far the analysis has been good.
Laryn |
niles steckbauer (Niles500)
Registered Member
Username: Niles500
Post Number: 787
Registered: 11-2004
Posted From: 72.91.168.92
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 02, 2007 - 2:09 am: | |
Bill - I hesitate on posting this too - my HT755 ATEC gauge shows about 235 degrees when running OTR - seeems to be higher than a lot of posters - but I have no ill effects and I rely on the ATEC to shut me down if I'm out of bounds - FWIW
PS - same thing with my OIL Temp. |
Bill Gerrie (Bill_gerrie)
Registered Member
Username: Bill_gerrie
Post Number: 117
Registered: 3-2006
Posted From: 67.77.32.90
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 02, 2007 - 9:43 am: | |
Niles
Guess we have to depend on ATEC as not too much info is around for something like this. All I have seen is 300* is a no no but I don't exceed 240 at anytime so I guess it is okay.
Bill |
ned sanders (Uncle_ned)
Registered Member
Username: Uncle_ned
Post Number: 40
Registered: 5-2005
Posted From: 68.213.111.136
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 02, 2007 - 1:37 pm: | |
barn owl
I have an 04 with a 6v92 and v730. if you make horsepower you have heat.
I have tried numerous thing to cure the heat of my engine. On of those is to remove the transmision completely from the engine. all i have is a aux.cooler.
I talked with allison tech and he told me that 350 to 400 would not hurt my 730 just to keep an eye on the fluid. if it smells burnt then change it.Right now the hottest that i have seen it is around 300 coming up 421 out of bristol tn.
I live in the same terrain that you do and climb the same app. mountains. cooked one engine going to the campground off the skyline drive.
uncle ned |
Jim Wilke (Pd41044039)
Registered Member
Username: Pd41044039
Post Number: 189
Registered: 2-2001
Posted From: 69.77.155.72
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 02, 2007 - 8:29 pm: | |
Ned, you go 421 from Bristol to Boone???!!! Have you done that more than once?? I think that's the toughest hill around & nowhere to pull off really.
Jim-Bob
'59 4104, Jefferson, NC |