hey everyone. i am looking at putting in an englarged oil cooler to ensure my engine rebuild will never see the temps it once saw before i blew it. there are two that i can find offered..

-the ISC dual pass for 500 found here:

http://iscracing.net/2nd_Gen_Parts.htm


-and the flatout-motorsports single pass fluidyne oil cooler found here for 679:

http://www.flatout-motorsports.com/c...roducts_id/155


any discussion would help, and thanks for reading my post!
i know, a little expensive...

 

Most people just add a second stock cooler, much cheaper than going that route. Make sure you plumb them in parallel though, they work better that way.

 

Do you track your car?
turbo or n/a?
If turbo, do you run a fmic?

I've plumbed two stock oil coolers in parallel and then went with one single upgraded cooler and the upgraded cooler definitely works better.

I think for an n/a on the track or a turbo'd car only street driven, the dual coolers are sufficient. Do run them in parallel as Blak91n/a recommended.

Here is a thread of my install of the Flatout-Motorsports cooler whose parts I sourced myself. Pics, prices, part numbers:
https://www.rx7club.com/forum/showth...44#post6290444

 

the car is NA, but after 9k rpm for 25 mins on a hot day, i may as well kiss my oil seals goodbye. i forwarded the oil cooler info to my builder, hope he can work with it. you are the gd-man, sourcing the whole oil cooler kit yourself. kudos.

 

I recently ordered a Big race Radiator a big oil cooler from Mike at ISC.
found it was simpler that way instead of trying to source it myself.
Will let you all know how it works when I get them.

Strictly Rotary

 

going with the dual oil cooler setup, to save money. hope it works

 

I'd suspect that a good part of the difference that RX-Heaven saw was due to it being a new cooler with no bent fins or clogged passages. With a used stock cooler I'd be sure to straighten all the passages and let it soak with some solvent in the cooler to make sure that it's clear before using it. Another big part of the difference will be in the ducting, if the second cooler is right in front of the first and they're not seperately ducted, the air won't want to flow through them as much and the second cooler will be seeing the hot air from the first. If you address those issues, I don't see why it shouldn't outperform the aftermarket ones, since there should be more surface area, more volume and less pressure drop. Not to say that the big ones aren't good, but a lot of cooling has to do with the installation more than the equipment.

 

Dual stockers will handle an EP engine here in Fl. with no problem, you will be fine.

Ducting is the key to any good installation, plenty of ram air pressure for both coolers how ever you can do it.

 

Wise choice going with the dual stockers for your application. Put the money somewhere else, preferably a bank.

In any case, when I used the dual stockers in parallel, properly ducted and one on top of another so each received fresh air, they worked far better than just one cooler but my water temps went up because it was not getting as much fresh air now. Keep in mind I had a 4" fmic in front of the radiator too (the oil coolers were below and received fresh air) and I was making well over 400 rwhp. One of the coolers was brand new and the other was reconditoned, so both were in excellent shape fwiw. I'm not one to hack a bunch of crap together.

For the sake of simplicity and to help the water temps and hoping to lower the oil temps even more, I went with one oil cooler. Though I cannot remember the numbers, both the oil and water temps dropped and remained more consistent throughout. If you saw the Fluidyne cooler and compared it to the stock cooler side-by-side, you'd see the superior design. Surface area is important but isn't everything.