[DeTomaso] Oil temperature

Jeff Cobb jeffcobb1 at me.com
Sun Jun 12 12:14:49 EDT 2016


Interesting thread.
It has been documented many decades back in the aircraft industry that heat exchangers 
were more efficient if the exchangers airflow speed was much lower than the vehicles speed.
Cooling air needs time to conduct air from the cooling fins/coils surfaces otherwise the fins 
boundary air allows the laminar air rushing through to not touch the hot metal fins. 
So the ducts entry area needs to be less than the coolers surface area, maybe by 1/4th.

Oil temps should always be warmer than the coolant up to about coolants 210 F, though the oil 
heat rejection reserve capacity must be greater than that of the coolants so that at extreme temps 
the oils temp does not rise quicker nor higher than the coolant. 
After 230F + -, oil temps under load will rise much quicker than coolant temps so a larger reserve 
heat rejection option relative to coolants reserve design must be present so to not allow dangerous 
oil temps, ie; 280F.
The oil is primary in cooling all the interior heated parts directly whereas coolant takes heat from 
surfaces that are secondary heat conductors, are a slave to radiated heat or metals that capture/hold 
heat from friction.
Large oil coolers with a thermostatic controlled variable duct nozzle entry and thermostatically controlled 
oil flow may work the best in heat rejection to air.
Whereas a Laminova tubular coolers work the best in a cooling liquid because of the high surface area
and has a better ability to keep both temp closer together.

Keep cool,
Jeff Cobb

On Jun 12, 2016, at 8:26 AM, mark skwarek via DeTomaso <detomaso at server.detomasolist.com> wrote:

>   My oil cooler is mounted horizontally in front of the right rear wheel.
>   I have a separate oil pump to circulate the oil. Last year I ran some
>   ducting from my front spoiler to the oil cooler. While running at SSCC
>   last year 140 to 160 my oil temp was at 190 if I left the oil pump
>   running. I'm changing back to a scoop in front of the wheel to see what
>   happens this year.
>   Mark
>   5481
>   On Sunday, June 12, 2016 4:47 AM, Mike Drew via DeTomaso
>   <detomaso at server.detomasolist.com> wrote:
>     Agreed--I think the wheel well-mounted air-oil cooler was a
>   monumental
>     act of wishful thinking....
>     Mike
>     Sent from my iPad
>     On Jun 12, 2016, at 1:43 AM, Tomas Gunnarsson <[1][1]guson at home.se>
>   wrote:
>     What makes an air/oil cooler work is airflow through the cooler fins.
>   I
>     doubt that the pressure difference over an oil cooler in that
>   position
>     is significant, so it has limited effect on oil temp.
>     Tomas
>     <-----Ursprungligt Meddelande----->
>         From: Scott Mead Photography
>   [[2][2]scott at scottmeadphotography.com]
>     Sent: 11/6/2016 11:56:18 PM
>     To: [3][3]demongusta at gmail.com;[4][4]MikeLDrew at aol.com
>     Cc: [5][5]detomaso at server.detomasolist.com
>     Subject: Re: [DeTomaso] Oil temperature
>     Many moons ago, I saw a setup at Gary Hall's shop: He had installed a
>     reverse-louvered, splash panel on the right rear with an oil cooler
>     mounted to the inside (non-tire side) of the shield. The philosophy
>   was
>     that the spinning tire would provide a constant stream of air through
>     the louvers at speed, cooling the oil. Whether it effectively worked,
>   I
>     have no idea, but it was a clean setup.
>     FWIW,
>     Scott
>     -----Original Message-----
>     From: DeTomaso
>   [[6]mailto:[6]detomaso-bounces at server.detomasolist.com] On
>     Behalf Of Jack Donahue
>     Sent: Saturday, June 11, 2016 10:55 AM
>     To: Mike Drew
>     Cc: [7][7]detomaso at server.detomasolist.com
>     Subject: Re: [DeTomaso] Oil temperature
>     Out of curiosity, where would you add an oil cooler? And would it be
>   an
>     air-to-liquid - or - liquid-to-liquid cooler? Having moved the A/C
>     condenser to the front, I was thinking of using the original
>     condenser-space for an air-to-liquid cooler with a pusher fan. I get
>     the feeling, however, that it's a waste of time, which sounds
>     good/great to me. The old "track-pushing-hard" syndrome left me a few
>     years back. Always looking for a way to NOT look at the temp gauge on
>     hot days in traffic.
>> On Jun 11, 2016, at 1:40 PM, Mike Drew via DeTomaso
>     <[8][8]detomaso at server.detomasolist.com> wrote:
>> 
>> AJ,
>> 
>> Since you had instrumentation, what were your temps when driving at
>     freeway speeds?
>> 
>> Mike
>> 
>> Sent from my iPhone
>> 
>> On Jun 11, 2016, at 13:18, Asa Jay Laughton
>   <[9][9]asajay at asajay.com>
>     wrote:
>> 
>>> Talking with another open road racer a few years ago about this
>     topic, I was told you want about 230 degrees F and nothing near 290.
>     That's a nearly 60 degree difference. But the way he gave me the
>     information makes me think you want to make sure you stay down around
>     230. People smarter than me will know a lot more than me. I also run
>     Amsoil full synthetic and there is a temp for viscocity breakdown but
>   I
>     don't have the spec in front of me.
>>> 
>>> For open road racing, depnding on the engine build and speed, a
>     racer will definitely want an oil cooler. Last year I ran the 120
>   class
>     and spent a good amount of time near 130. My oil temp ran right
>   around
>     230, so I knew if I wanted to move up to the 130-140 class, I'd need
>   to
>     add an oil cooler.
>>> 
>>> Your mileage may vary,
>>> Asa Jay
>>> 
>>> 
>>> 
>>> 
>>> Quoting Jack Donahue <[10][10]demongusta at gmail.com>:
>>> 
>>>> Once again, as summer approaches, cooling becomes an issue and
>     topic of some discussion. Rather than beating the radiator, water
>   pump,
>     thermostat, and pressure cap horses to death, I thought I would
>   pursue
>     the oil temperature. So, all you gurus, what is the normal range of
>   an
>     oil temperature in these beautiful beasts? My next little project
>   (get
>     in line) is to install an oil temp gauge. Waste of time? I guess I
>   need
>     some feedback. All input is appreciated.
>>>> #4348
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>   References
>     1. mailto:[23]guson at home.se
>     2. mailto:[24]scott at scottmeadphotography.com
>     3. mailto:[25]demongusta at gmail.com
>     4. mailto:[26]MikeLDrew at aol.com
>     5. mailto:[27]detomaso at server.detomasolist.com
>     6. mailto:[28]detomaso-bounces at server.detomasolist.com
>     7. mailto:[29]detomaso at server.detomasolist.com
>     8. mailto:[30]detomaso at server.detomasolist.com
>     9. mailto:[31]asajay at asajay.com
>     10. mailto:[32]demongusta at gmail.com
>     11. mailto:[33]DeTomaso at server.detomasolist.com
>     12. [34]http://server.detomasolist.com/mailman/listinfo/detomaso
>     13. [35]http://www.w7tsc.org/
>     14. [36]http://www.teampanteraracing.com/
>     15. mailto:[37]DeTomaso at server.detomasolist.com
>     16. [38]http://server.detomasolist.com/mailman/listinfo/detomaso
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> References
> 
>   1. mailto:guson at home.se
>   2. mailto:scott at scottmeadphotography.com
>   3. mailto:demongusta at gmail.com
>   4. mailto:MikeLDrew at aol.com
>   5. mailto:detomaso at server.detomasolist.com
>   6. mailto:detomaso-bounces at server.detomasolist.com
>   7. mailto:detomaso at server.detomasolist.com
>   8. mailto:detomaso at server.detomasolist.com
>   9. mailto:asajay at asajay.com
>  10. mailto:demongusta at gmail.com
>  11. mailto:DeTomaso at server.detomasolist.com
>  12. http://server.detomasolist.com/mailman/listinfo/detomaso
>  13. http://www.w7tsc.org/
>  14. http://www.teampanteraracing.com/
>  15. mailto:DeTomaso at server.detomasolist.com
>  16. http://server.detomasolist.com/mailman/listinfo/detomaso
>  17. mailto:DeTomaso at server.detomasolist.com
>  18. http://server.detomasolist.com/mailman/listinfo/detomaso
>  19. mailto:DeTomaso at server.detomasolist.com
>  20. http://server.detomasolist.com/mailman/listinfo/detomaso
>  21. mailto:DeTomaso at server.detomasolist.com
>  22. http://server.detomasolist.com/mailman/listinfo/detomaso
>  23. mailto:guson at home.se
>  24. mailto:scott at scottmeadphotography.com
>  25. mailto:demongusta at gmail.com
>  26. mailto:MikeLDrew at aol.com
>  27. mailto:detomaso at server.detomasolist.com
>  28. mailto:detomaso-bounces at server.detomasolist.com
>  29. mailto:detomaso at server.detomasolist.com
>  30. mailto:detomaso at server.detomasolist.com
>  31. mailto:asajay at asajay.com
>  32. mailto:demongusta at gmail.com
>  33. mailto:DeTomaso at server.detomasolist.com
>  34. http://server.detomasolist.com/mailman/listinfo/detomaso
>  35. http://www.w7tsc.org/
>  36. http://www.teampanteraracing.com/
>  37. mailto:DeTomaso at server.detomasolist.com
>  38. http://server.detomasolist.com/mailman/listinfo/detomaso
>  39. mailto:DeTomaso at server.detomasolist.com
>  40. http://server.detomasolist.com/mailman/listinfo/detomaso
>  41. mailto:DeTomaso at server.detomasolist.com
>  42. http://server.detomasolist.com/mailman/listinfo/detomaso
>  43. mailto:DeTomaso at server.detomasolist.com
>  44. http://server.detomasolist.com/mailman/listinfo/detomaso
>  45. mailto:DeTomaso at server.detomasolist.com
>  46. http://server.detomasolist.com/mailman/listinfo/detomaso
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