airworks-fc3s

in summer, when you push your 7 to the limits, it's likely that oil temps rise like hell and don't seem to have any upper limit ...

in my opinion a bad thing so here's my idea of remedy! anyone think it's going to work?

No_Rotor_RX7

you going to run them parrallel?

KNONFS

iTrader: (14)

I am, since its winter time, I have not completed the dual oil cooler setup; however the lines are done, and the oil cooler have been mounted. I took a diferent approach as the location of the second cooler, it sits behind the fiberglass bumper suport.

airworks-fc3s

had that in mind too, but i didn't want to make the front duct smaller than it already is!
going to run them consecutively, one after the other!

Black91n/a

Running them one above the other like that will block airflow to the rad, which is a bad thing. The coolers will also operate more efficiently if they're run in parallel. The rate of cooling depends on the relative temperatures, running the second cooler after the first means that this difference is smaller, so there's less cooling happening.

I'd run them in parallel, one behind the other to not block too much radiator flow. If you do some ducting to give the oil cooler a dedicated airstream it'll cool better too.

airworks-fc3s

those are good thoughts thanks man!... might have to change my mind...

i would then take two Y splitters and let the oil get through both of them at the same time and return from them back to the engine... but if i do this, think i'll have some big pressure loss because i run double volume than stock!?

mounting wise, i don't think it'll make a difference, 'cause there is a huge intercooler right behind the front duct that is blocking air anyway... and i'm running the stock fan (which is quite strong)!

Mushy B

i like your idea.... blocking radiator wouldn't be good but the concept makes sense. goodluck with the new setup and new location of your second oil cooler.

Black91n/a

Actually running them in parallel gives LESS flow resistance, because there's only half as much oil going through each cooler half as fast, over half as much distance, which significantly reduces the pressure drop and flow reductions compared to a series setup.

http://www.negative-camber.org/crisp...c/fcpart28.htm

airworks-fc3s

thanks for the nice link!!
the only thing is, i can't mount it anywhere else, 'cause the FMIC is taking too much space...

Aaron Cake

iTrader: (1)

It's also amazing how a little bit of ducting helps. Cut a hole at the front of the undertray and make a duct that leads from the leading edge of that hole to the top of the oil cooler. Instant 30 degree reduction...

hIGGI

iTrader: (7)

i am running it this way for 2 years already, in series, both thermostats working and i am very happy with it

http://rx7cz.net/photos/workshop94/

Black91n/a

For more air you can build somethig like this.

Valkyrie

Why not use a pair of small e-fans or something? (suction-type of course)

And of course, better ducting.

And if you're really desperate, a vented hood.

airworks-fc3s

?? you mean from under the lip??

Aaron Cake

iTrader: (1)

Black91n/a posted a picture of almost exactly what I was talking about. The only other addition is a duct that leads directly to the oil cooler.

papiogxl

iTrader: (6)

To get more air to the top one, you can try the hole in the front bumper molding between the turn signals too.

airworks-fc3s

thought of that one, but the nice clean looks of the FC prevents me of doin' it!

SpooledupRacing

why not just get a larger aftrmarket oil cooler and be done with it, seriously I dont thik 2 coolers will be all the extra effective since u have so much extra ground to cover..

not only that but I never had a problem with my car this summer

87 t-66

iTrader: (133)

the stock fc oil coolers are better than pretty much any other cooler out there and they are inexpensive. they are huge! it would cost a lot of money to find a better set up with aftermarket coolers.

SpooledupRacing

ok if they are so good then why use more then one?

87 t-66

iTrader: (133)

high hp applications or if you go to the track a lot. its not gonna hurt anything

fastrotaries

I'm going to shroud my cooler independantly and within the shrouding of the FMIC in front of it, and Rad that sits behind it. Furhtermore, I plan on purchasing some NACA ducts and place them into the bottom plastic tray and have them pointed at the Oil cooler duct.

CrispyRX7

iTrader: (139)

My page.

And yes I ran a second duct from under the front splitter to direct fresh air directly to the rear oil cooler. In essence each cooler gets it's own fresh air source without blocking flow to the radiator any more than the stock single cooler would.

....FWIW
Crispy

Black91n/a

The stock coolers are large, but the rotary depends on oil for about 1/4 to 1/3 of all cooling, especially under high loads. Lots of people have looked at their on track oil temps and decided that they needed more cooling due to high temps, that's why two are used. If I were to get aftermarket oil cooler(s) I'd probably put them in the side brake ducts, that way the rad gets a completely seperate, not pre-heated airstream. The advantage of a second stock cooler is price, they can be had for less than $100, where aftermarket ones will run you several hundred each.

vipers

iTrader: (8)

very nice thread, this is what ive had in mind to do for a while now... my oil temps went to 265 while climbing a mountain... so i planned on 2 coolers + the independent ducting to each