Seems like a year ago I promised someone I'd send some pics of my dual, stock oil coolers on my ITS car. I finally took the pics a month or so ago and just now hosted them. Here they are. The first two are of the "T" fittings used to route the oil. The last one is of the mount. All it is is a piece of 1/8" aluminum with four holes. Two are used to tie each one into the backside of the original mount and the other two are used to bolt the second cooler to in front of the other cooler which sits in the original stock mount. It ain't much but it might help? BTW, with the proper ducting this setup has cured some serious overheating issues.


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Chris

 

help any?

 

A ton. The second cooler and some ducting work brought the water temps down from the 250-260 range to 210-220 and the oil from 250 down to 180-200.

Chris

 

I was thinking about doing this for some time now! Except mounting it somewhat differently. Looks like yours are mounted one in front of the other?

 

Why did you mount them in front of each other instead of on top of each other?

Did you run the oil lines in parallel to the coolers (out of motor, into both coolers, out of both coolers, into motor).................or did you run them in series (out of motor in the first, out the first, in the second, out the second, into motor)?

Looks good though, thanks for the pics.

 

i don't think parallel would work.

 

What is your oil pressure now?

 

What is your oil pressure now?

 

Ok. I first mounted them one on top of the other and that was a big mistake. Pretty much shut the air off to the rad. Bad idea. Moved the second cooler in front of the stock cooler because it was easy basically. The cooler in the stock location isn't getting as much air but the setup is very effective on track. When I first laid it out like this I had thought of some ducting across the top and sides of the two coolers to keep the air from spilling out and helping to flow more air across the back cooler but that has proved to not be neccesary.

The coolers are plumbed in parallel. You can see the two "T" fittings mounted on the rear cooler. There is a higher pressure drop when running the coolers in series.

Pressure before the second cooler was 120 psi @ WOT with the Comp regulator. It's dropped to about 105 psi with the second cooler.

All in all, cheap, easy, effective.

Chris

 

Parallel plumbing is in fact the correct way to do it. Series plumbing doubles the pressure drop compared to a single cooler, and doesn't evenly split the heat load. Parallel plumbing halves the pressure drop compared to a single cooler and evenly splits the heat load between the two coolers.

 

i would think by slowwing the oil thru coolers would increase heat transfer also...

 

Most of the IT racers that run dual stock coolers use parallel. I have heard of a coupe using series succesfully. Don't have good numbers on pressure drop or temps though. Common theory seems to be that series creates a larger pressure drop though.

Chris

 

Are you running thermostats in the coolers? If not did you remove them or did you make something up?

James

 

No thermos. Just pull them out and install a bolt and locknut of the same size as the hole in the cooler.

Chris

 

Why wouldn't you run the thermostat's? Overcooled oil is no more use than overheated oil.

 

The thermos are just one more thing that can present a failure issue. I've been racing in one form or another for over ten years and my motto is to make things as simple as possible. And if dual coolers are needed, over cooling probably isn't an issue. Temp gauges come in handy that way.

Chris

 

I'm still curious why you needed two oil coolers to control temps. I've seen dozens and dozens of rotary race cars over the years and never seen anybody running two oil coolers. Very few even bother upgrading the stock unit. Perhaps a faulty thermostat caused the problem in the first place. Did you try running one oil cooler without a thermostat?

 

Upgrading the oil cooling is a very, very common practice among road racers. Just about every top level ITS car in this country has taken upgraded oil cooling into consideration. Water-oil coolers are popular and work well but are expensive and require more radiator than I have at the moment.

Yes. The thermo was gutted on the single cooler before we went to the dual setup.

Maybe it's just colder in New Zealand?

 

A lazy person writes.....* Did you buy the fittings online or at a local hydraulic shop? *

 

Went with -10AN adapters from Racing Beat and then the rest of the stuff came from various places. Local, Summit, Pegasus. Where ever I happened to be shopping that week. The only thing that's kinda hard to find are the Ts. Pegasus has them in their online catalog though.

 

 

 

I'd like to say *Thank You* for the information. It was the tee's more than anything else that was bothering me.

 

Just talking to a buddy today about this and he reminded me that the R1 3Gs came with dual oil coolers. Something for the Kiwis to mull over I guess.

 

KIWI'S are good at mulling. I thought about doing what you did, looked at the online catalogs etc. I figure, using a spare cooler I have, it would cost close to two hundred bucks to do what you did. Still mulling. Not mulling as good as a Kiwi, but still mulling.

Might do it if I can ever get my Ryobi weed whacker running. That thing baffles me. I'm learning about two strokes anyway.