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Posted by: brumi Aug 13 2012, 07:30 AM

Here are a couple of pics showing how I cool the transaxle on my vintage 914/6 race car
Pump ( white ) is gear driven. filter ( red ) has temperature couple, fluidyne oil radiator is mounted between the megaphones

Posted by: brant Aug 13 2012, 09:07 AM

nice job
can you add pictures of your cooler from below
I would love to see your mounting bracket

thanks
brant

Posted by: Randal Aug 13 2012, 12:33 PM

When you put the V bar in the truck, tied to the shock towers, could you feel any difference in the handling?

Nice job on the cooling system.

Posted by: pcar916 Aug 16 2012, 10:59 AM

Looks good! I have my auxiliary engine cooler in the same spot.

Posted by: chilling in vt Aug 19 2012, 03:56 PM

Very nice! If you get a chance, could you post some pictures of the hook ups to the transmission? What kind of temps are you you seeing with the cooler? We are seeing 200-230 with a 2.5 liter six and a 901. Cooler is always better

Posted by: brumi Aug 21 2012, 10:09 AM

Not a lot of light to get good pics of transaxle hookups. All braided lines
Basically an o-ring boss outflow from the drain plug ( AN-8 )
Then thru filter, radiator, pump and then a return line that Ts off to a AN 8 into front of case and a AN 6 return thru intermediate plate
No spray bars or nozzles, basically just get the oil out, cooled and back into box
Never seen higher than 190 degrees

Posted by: brumi Sep 1 2012, 04:02 PM

To chilling in vt
I had the car up for some servicing so I took a couple of pics of the cooler install , outlet with o ring boss, return ( -8 in case and -6 thru intermediate plate
Ran at track in the mid 80s and temp ( sensor in red filter ) never exceeded190


Attached thumbnail(s)

Posted by: chilling in vt Sep 2 2012, 03:58 PM

Thanks! That is one very clean car.

Posted by: brumi Sep 3 2012, 04:42 PM

Thanks
As my mentor in building race cars stressed to me over 25 years ago " there are dozens of reasons for not going fast, but no reason for being a slob "

Posted by: naro914 Sep 12 2012, 06:16 AM

Pics of mine on this thread
http://www.914world.com/bbs2/index.php?showtopic=177277&st=0
and http://www.facebook.com/naroescapemotorsports

Posted by: larryM Nov 8 2012, 10:35 PM

but - WHY ??

it makes sense for a 24-hrs enduro World Makes Championship run in 1970-72

but vintage racing today is only about 15-20 minutes on track

so why bother -??

(yep - i know - i BTDT - old age now questions the folly of my youthful fevers)

.

Posted by: Trekkor Nov 9 2012, 12:16 AM

Nice pics.

Thank you!


KT

Posted by: naro914 Nov 9 2012, 04:19 AM

Are you asking "why bother with trans cooling"?
Agreed, if you're running stock engine, wheels, etc. probably no need.

But I'm pushing 330 +/- hp with the stress of 12" wide slicks through a basically stock 901 trans that was build with about 100 hp in mind back in the day... THAT'S why.

Plus, PCA enduro races are 90 minutes.

Posted by: bulitt Nov 9 2012, 05:20 AM

This huge fan on the rear end is one approach.

Posted by: brant Nov 9 2012, 09:22 AM

With the trans cooler:
I'm getting 220 degree's after 20 minute vintage race with a 2liter on an 80 degree day at coronado island/sea level

(I also ran at hallet, oklahoma which is 900ft above sea level. I still ran 220 on an 80degree ambient day)

imagine what I was getting before the cooler at the event I blew the trans up last july. It was a 110 degree day and we had 2 drivers on the car that day, running back to back sessions at 5000ft of elevation where the air is less dense and cooling less efficient by far...

I didn't have a gauge on it then, but I'm guessing 260f or more is the norm without a cooler (in a 20 minute session with a tiny 2.0 motor)

I also would theorize that lower gears, smaller diameter wheels, more rpm and definitely a clutch limited slip differential would add to the heat problem if a person has any of those contributing factors.

putting a gauge on the tranny is a real eye opener... no wonder everyone has always said the 901 couldn't handle high hp. I still believe its a 250hp tranny but that keeping oil temps in check is mandatory just like you would for a motor.

for example, you don't hear people recommending to skip front coolers on race cars or that its a waste of time to install an oil temp gauge for an air cooled motor.

brant

Posted by: brant Nov 9 2012, 12:01 PM

an ideal placement for exit air on a 914 is the panel between the tail lights
fine for a PCA car, but not legal for most vintage organizations...

Posted by: Retread Nov 10 2012, 03:03 PM

Very tidy car.What venues do you run?

I have had a temp guage on the tranny for many years. No LSD so temps are not to bad (those lsd clutches do add heat).

I think the rational limit for uncooled 901 based gearboxes in competion is about 180 HP (as improved). Or 210 degees if you ar using Swepco.

I run a stock class 914/4 2.0 car.

It looks to me like the cooled oil is being spraed on the Ring gear. If so that is good, but not good if in the toothed side (from WEVO).

I did not see a filter, which is a matter some concern, since tranies are a dirty world.


B/r

Retread
V

Posted by: moggy Nov 12 2012, 03:28 PM

I had the same problem. Here's my solution.

I can't install the cooler anywhere under the car or in the inner wings due to the amount of crap flying around under there during a rally. Here's where I installed it



to then encourage some natural air flow I then drilled some holes in the bootlid under the kick spoiler and installed a grill (same look and feel as the engine grill). This is in a negative pressure air zone so will suck air through whilst retaining a stock ('ish) look.





also, while I've got Photobucket open, here's my box

Posted by: steuspeed Nov 12 2012, 04:18 PM

^^^ Slick!