Troicoid will prolly get angry at me for posting this but i dont care. I found a couple oil coolers online that i think are larger than what the stock non-beehive oilcooler.

Someone said, that there wasnt one out there that was big enough for the rx7, so use the stock one. Well i found a stock one, they want 120 bucks for it out of my local pick-a-part. Then i searched google and found two oil coolers that are fairly large and just wanted to know if they get the approval of the ppl on this site that know a little something about how much oil flows through these things. Are these adequete?

 

The top one is about half to two thirds of the size of the stock FC one.

The bottom one doesn't have nearly as thick a core.

If your local scrap yard is too expensive, look in the yellow pages for another, find someone parting out a car, or find another source.

Hit up http://www.car-part.com

 

Trochoid angry for you buying an aftermarket item ? I doubt that. Get one and use it and let us know. Then he might even buy one.

5/9" tubes ? That's an odd fraction.

 

Trochoid got mad at him for asking the same question over and over.

He's looking for an oil cooler.

He wanted to use the A/C condenser... He wanted to use the tranny cooler...



He's looking to find an STD in a brothel. He needs an oil cooler, and we've simply got the best...

 

90's turbo volvo has one that would be large enough, but I'm not positive of the model. Can post pic of the one in the corner here tomorrow if you like. Also not sure if it'd fit. Figure 3' long by 4x4 inches. Fittings on either end.
There are larger and better aftmkt coolers out there, look in Summit racing or Jeg's, but you run into money real fast. You should see the one we put on my old 1.9L turbo diesel VW pickup....

In the end, this is one of the things that with which you get what you pay for.
Applies to the cooler lines as well.
Rotary or not.

 

I just read in another thread that the stock oil cooler in an FC is bigger than the one in an F350 turbo-diesel tow truck.

 

Sorry. I had NO IDEA ! In that case... f*ck him and feed him hotdogs!

 

Hey,

I have an extra one for a gsl-se style ... no lines though, might need little welding at the infamoust spot right under threaded part ... haven't tested it, but willing to let it go for about 40$ plus shipping

 

How damn hot does the oil get in these things??

And on the 06 PS f250/350 fords I don't think the oil cooler is really that big, remember it probly holds 12qts of oil or more..

Now the intercooler, those are pretty big..

 

I was just wondering why people seem to be annoyed with chedda's question, so I searched for a few more of his posts.

Anyway I found this in a different thread (My bad, it wasn't a Turbo diesel, but a diesel) :

Form here: https://www.rx7club.com/1st-generation-specific-1979-1985-18/possible-use-old-auto-oil-cooler-your-engine-607565/

 

don't go and buy any old oil cooler. without the right thermostat your oil might ruh too cool or too hot... Then "KABOOOOOM!!!! OH why oh why didn't I just listen to trochoid and the others!!"

 

[QUOTE=wolf_walker]How damn hot does the oil get in these things??QUOTE]
Oil all through and in the combustion area and moving surfaces + high rotary temps.

 

How high?
I don't not believe, just curious.

 

I wouldn't trust those myself. They don't appear to have a thermostat for one. The 2nd is size consideration. The top one is a similar style to the stock one, but appears to be much smaller. The other may have enough surface area, but is a different style.

I know that we may seem a little paranoid when it comes to these aftermarket oil coolers, but we all know how important removing heat from the oil for the rotary is. We don't want you to risk losing an engine over this. Our engines need to remove about 1/3 of the total heat from the oil system. I doubt many people would be asking to put a smaller/thinner radiator, smaller waterpump, etc. just becuase it was cheaper or easier to get. The same thing applies with the oil cooler. For an aftermarket oil cooler to work it needs:

- large enough oil lines and a pressure drop that is the same or less than stock
- heat transfer area equal/greater than stock
- same construction is stock
- thermostat
- heat transfer coefficient same/better than stock (depends on fins, flow paths, materials (to help with conduction limited heat transfer, use aluminum etc.)

It is best to use stock. If you can't find a 1st gen oil cooler, get one from a 2nd gen and adapt it. It is too bad that the stock ones are so expensive new. Eventually we will run into the problem where no good used oil coolers will be available and will either need to buy new stock or buy an afytermarket that will do the job. We are not at that point yet. Just get a used one and call it a day. Just IMO.

Kent

 

$40 to $70 is the norm for the stock FMOC...your salvage yard is trying to bend you over...search eBay or try the classifieds here which often have them for sale.

Forget the bottom 4 pass "radiator", it's the kiss of death for a rotary.

 

+1

 

Straight from Racing Beats Catalog!
(Stock Mazda Rotary)=71psi @ 3000rpm 15psi @ Idle
Normal Oil Temps=140F to 200F
210F or above= Pull over for awhile unless of course you got a Modded Motor to take the Higher #'s

My StreetPort, Mild Brigeport runs 30-35psi @ Idle
and 68-75psi @ 3500-8500rpm
Oil Temps run 140F-190F w/ Castrol 20-50 Motor Oil.
Readings come from (Nordskog Digital Gauges)...
Under Radiator FMOC and RB Oil Pressure/Temperature Adapter.

Alot depends on outside Temp of course. But these are pretty much where my numbers stay.
sgieldon
steve

 

That's actually a little on the cool side for a gas motor. I average 100C(212F) on a stock 4 banger VW with the less than perfectly efficient stock oil/water cooler. My TD's run more than that if your boosting hard and running a lot of fuel enrichment.

 

Why are you searching just get a used stock1 this seams so simple. You are doing nothing but coming up with dumb ideals. I say run what ever you want but the stock is best either bite the bullet by the right part or sale your car before you **** it up.

 

Mad, no, I've had my say, heed if you want or do what you want. It's your engine.

Next time, at least spell my user name correctly.

 

Here's my "+1" to that, brother...lol

 

Have you tried looking/posting in the second generation For Sale/Wanted section? There has to be someone on the forum who's looking to sell an oil cooler.

 

i got a good stack 12A with hoses for sale. Might have a 2nd gen without hoses.

 

There you go.

Trochoid has a write-up on how to install a second gen oil cooler on your first gen's engine.

What kind of shape is the second gen oil cooler in? How much do you want for it?

 

At the risk of sounding like a jerk, what's the obsession with an OEM oil cooler?
I'm sure it's a quality piece and all, but there are hundreds of them available in any size and shape you could want.
The cooler and the lines go out pretty regular after a couple decades on the Saab's and Mercedes I tinker with, we get better hoses made and often upgrade to larger oil coolers providing the system has a thermostat to maintain a proper minimum temp.

I'm not advocating the use of an ac condenser or something, but this is all quite the opposite of what I'm used to hearing.

This is the one I put on the last 1.9TD conversion I did.