Now before anyone replies that it isn't necessary, I need to clarify that the stock setup is changed. It's a 79 RX7 running a large streetported 74-78 13B block with a T04b and an unknown widebody kit. I include mentioning the widebody kit because it changes the frontal area. In the process of building the car - swapped from the old project car - it was deemed necessary that the old oil cooler setup had to be redone. The old setup had the oil cooler positioned below the radiator. So with the change to an electric fan setup years ago, the oil and coolant temps were always within reason. Now, as many 1st gen owners know, these oil coolers tend to leak at the banjo bolt connections - especially once they are moved about. After going through several 1st gen oil coolers - having them rewelded and even had aluminum blocks installed (drilled and tapped) over the old outlets on the oil cooler - they all ended up leaking regardless. And yes, I was careful about tightening them.
Anyway, the setup was finally changed to a 2nd gen oil cooler, and this in turn allowed for a taller and bigger radiator. I followed the guide on this forum - but I can't remember who to give the credit to. So, currently the 2nd gen oil cooler is mounted on top of the 2"(?) bar that runs across and in front of the radiator and the new setup works great and is leak free - except for the actual cooling it gets at this time. Since the oil cooler now sits several inches away from the radiator - and it unfortunately sits in more of a dead flow area - temps easily get to 250 degrees now - even at sustained speeds above 75 mph. When the electric fan comes on, the temps do drop considerably, but slowly. Now, it's obvious that I cannot rely on the radiator fan to cool the oil cooler - unless I turn the dial for the radiator fan to have it set to run all the time (which I had to do on a 2000 mile trip). So, after alot of thinking about how I can go about it, I decided that I should install some 4.7" fans as either pushers or pullers - as mounting the oil cooler in any other position would prove to be too much work and may avail to very little. There is also a frontal air to air intercooler that was added into the equation. I did some searching and have come across a few online, but before pulling the trigger, I figured I'd ask here to see if there are any other recommendations out there.

The ones I found so far are fog, salt and waterproof, but they vary in temperature range, amps, cfm, static pressure and rpm ratings. The one with the best temperature rating is also the weakest of the 3, but the more powerful ones have a smaller temp rating. I was thinking of a pair of the Super High fans, (the 1st link below) but I wasn't sure if the static pressure rating is high enough. These are the ones I have it narrowed down to, and I plan on buying a pair of them:

OD1238 Super High* - Orion Fans

OD1238VXC* - Orion Fans

OD1238XC - Orion Fans

The only concern I have about the above fans is in their design. The old car had a Black Magic fan in it with a similar design (without the plastic ring connecting the outside of the fan blades) and it self destructed one day leaving pieces of fan blades everywhere. Surprisingly the radiator was ok - albeit a few nicks, but I expected it to have been punctured. I definitely can't have that with the oil cooler. Maybe it was a fluke I guess with that company.

The oil cooler is 4.72" high (or 120mm) for reference sake.

If anyone has any other suggestions or recommendations, please let me know. Thanks!

Brian

 

Well after doing some searching, it seems to be that the normal range for static pressure of an electric fan for a radiator is generally between 0.5" - 0.7". So, it looks like I'll give the Super High Orion fans a shot. I got them from here:
Orion (Knight Electronics, Inc.) - OD1238-12HHB - Fans, Motors & Thermal Management - Fans - Allied Electronics
Hopefully can't go wrong for a pair for $40