radiators for automatics
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Originally Posted by alexdimen
or run a transmission cooler...
#7
Racecar - Formula 2000
Originally Posted by AndyMac
The Auto FD already has a transmission cooler. The radiator feeds in from the cooler and back out.
Dave
Last edited by DaveW; 01-31-07 at 08:53 AM.
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#8
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Originally Posted by DaveW
The reason the post you commented on mentioned a separate cooler is that the original poster (OP) needs a new radiator, and there are very few suppliers where he lives. And the Koyo rad he wanted to get doesn't have an auto-trans model with a cooler built in.
Dave
Dave
#9
Racecar - Formula 2000
Hmmmm...
Then I apologize for my comment...
Dave
Then I apologize for my comment...
Dave
#11
TANSTAFL
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I've always wondered why cars pass auto trans fluid through the radiator in the first place. Is it to keep the trans fluid at a nominal operating temperature (regulated by coolant temperature)? ...Or does the transmission fluid in an auto really get so hot that it needs to be cooled?
#12
Racecar - Formula 2000
Originally Posted by alexdimen
I've always wondered why cars pass auto trans fluid through the radiator in the first place. Is it to keep the trans fluid at a nominal operating temperature (regulated by coolant temperature)? ...Or does the transmission fluid in an auto really get so hot that it needs to be cooled?
Dave
#14
TANSTAFL
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Originally Posted by DaveW
Actually, it's both. Too cold, and the trans may not shift properly, and the too-thick fluid can cause clutch slippage. On the other end of the scale, auto-trans fluid can, and often does, get so hot that it oxidizes. This results in glazing the clutches, and/or loss of lubricating properties, either of which is obviously not good. Typically, oxidized fluid will begin to turn brown and murky-looking. It will often also smell burnt.
Dave
Dave
#16
Racecar - Formula 2000
Originally Posted by alexdimen
Thanks for the explanation. Why don't manual gear boxes need cooling? Would they benefit from regulated temperature?
Also, gear oils used in manuals are not (in most cases) as sensitive to heat as most automatic trans fluids, which need to have very closely controlled friction properties so that the clutches will work.
Dave
#17
Racecar - Formula 2000
Additional comment - shifting when cold could be improved by better temperature regulation (heating the fluid in cold weather, similar to what the radiator cooler does for automatics). However, in most cases, it is not enough of a problem to warrant the addition of a pump to circulate the fluid. In an automatic tranny, there is already a pump(s) present, so circulation is not an issue.
Dave
Dave
#19
Tucson Rotary
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Originally Posted by Authentikdit
I wouldn't bother..Fluidyne makes a very good radiator for automatics and is relatively inexpensive.
Here is one:
http://www.awrracing.com/store/produ...&products_id=6
From my point of view it is the most cost effective way to go.
The cost of additional cooler, associated parts, fabrication and added weight doesn't warrant it for me. Besides if motorsport uses it then that is just another mark in its favor. I believe the "you can pay me now or pay me later" applies here also.
My thoughts on using the manual radiator and not adding an external. Driveability could suffer due to slow warm up of trans oil, long term it will hurt the transmission. Changed the fluid more frequently would help buy time though.
Dave w's post explains it well:
Quote:
Originally Posted by alexdimen
I've always wondered why cars pass auto trans fluid through the radiator in the first place. Is it to keep the trans fluid at a nominal operating temperature (regulated by coolant temperature)? ...Or does the transmission fluid in an auto really get so hot that it needs to be cooled?
Actually, it's both. Too cold, and the trans may not shift properly, and the too-thick fluid can cause clutch slippage. On the other end of the scale, auto-trans fluid can, and often does, get so hot that it oxidizes. This results in glazing the clutches, and/or loss of lubricating properties, either of which is obviously not good. Typically, oxidized fluid will begin to turn brown and murky-looking. It will often also smell burnt.
Dave
___________
Here in the desert we are always looking for better ways to cool rotaries and really are hard pressed to give up any means of cooling.
I think this thread is turning out to be a better resource for information on radiators for the auto fd than - radiator+automatic
thanks
J
#20
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I would purchase the KOYO (as I did), bypass the radiator's coolant coil lines directly to the dedicated transmission cooler. My FD was automatic, and I did just this. In all honesty, the temps will more than likely drop due to not being heated by the already hot engine coolant. The effects of the transmission coil are only purposeful in extremely cold climates to assure the transmission coolant isn't below a safe operating range.
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