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flosho

My stock oil cooler is just fine, however the lines going to it conflict with a few other parts, namely my down pipe, so I need a new solution.

Should I just replace the factory lines with a suitable replacement. I don't think I will go with AN but instead the high temp silicone style with fire-sleeve over them.

Or should I just go all brand new oil cooler? I see a bunch of them for cheap (Under $50-75) and then there are more expensive ones. Does anyone have experience with aftermarket units that they could recommend?
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stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

If you need more cooling, I have used an aftermarket cooler in front of the radiator in series with the factory 931 cooler, and this set up worked well. I had a small hose coming out of the factory cooler into the second oil cooler, then an extension hose from the second cooler linking to the return hose back to the block. The factory cooler did not provide enough oil cooling for the track on hot days. With this set up, you could also replace the return hose, so it was instead one hose back to the block, routing for your particulars, and also fabricate a new hose to the factory cooler. Mine second cooler was a relatively generic unit. I cannot recall where the fittings were (bottom or side facing the factory cooler.)
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

flosho · Posted: Tue Oct 25, 2011 6:55 am Post subject:

I don't know that the factory one isn't enough, its simply the design of the lines interferes with my set up.
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Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

With coolers I always like to overcapacitate. Only for an intercooler there's an advantage if you calculate stuff for optimization, but for the other coolers I'm pretty sure overkill is the way to go. Can't have enough capacity imho and flow isn't that important.

Of course there are limits...

I mounted the first cooler I could get my hands on. Kept the oil always steady. Don't know the size of the stock cooler, mine was 30x15x2 or something like that. In metric cm ofcourse.
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

flosho · Posted: Tue Oct 25, 2011 9:06 am Post subject:

So you don't think that having an oversized cooler could cause a drop in oil pressure or something like that?
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stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

size of cooler is not related to oil pressure. as long as oil is in your sump, you are good. cooler oil however, should keep oil pressure up a bit.
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

I forgot to mention... oversize only works when using a thermostat, which is a must. You shouldn't cool without a thermostat, except for intercool which can't be too cool.

pressure can't drop instantly anyways when using a thermostat. It's a smooth continuous thing, not an on/off switch.
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

924RACR · Posted: Wed Oct 26, 2011 9:23 pm Post subject:

I'm using a plate-style on mine; inexpensive, large (8.5x11"), very robust (been stuffed into numerous walls) and effective.

Non-racers could probably get away with smaller (for an NA).

Use AN-type braided stainless. It's safer. The other stuff isn't usually rated quite for the pressure and temp range. BTDT.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

flosho · Posted: Thu Oct 27, 2011 7:08 am Post subject:

Thanks for the input guys.

I'm gonna get something figured out this week.

On another note, I need a fuel filter to replace the OEM one. I don't want a huge OEM style one.

I see a lot of in-line filters but they all state that the are NOT for "Fuel Injection".

So are these not to be used? The other thing is I was looking at is other OEM units, but I'm concerned that they won't flow enough for my application?
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stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

Unless there is a credible reason for not wanting a huge filter, other than it is large, one could be asking for trouble by messing with this. The fuel is under relatively high pressure and one might think the risks far outweigh the rewards.
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

daniel · Joined: 18 Jun 2009 Posts: 686 Location: Sydney, Australia

I tend to agree, stick with the standard filter. It will handle the pressure AND filter the fuel well enough for the CIS that we have.
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet

flosho · Posted: Fri Oct 28, 2011 12:59 am Post subject:

daniel, I've switched to EFI long ago.

The main reason I need a smaller filter is because I'm trying to simplify the fuel lines and I have very little free space in my engine bay.
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leadfoot · Posted: Fri Dec 16, 2011 12:05 pm Post subject:

Fwiw, if contemplating a change to the stock setup I would advise getting a remote oil filter mount as part of the setup, ah the ease of a vertical install...
One thing to also note that if also messing with the factory coolant fan resistor, the one which operates in slow mode when the cars off then an oil cooler is the most effective way of controlling heat soak on shutdown
In the previous car i used an automotion 24" * 3" cooler and got hard lines made up by enzed (hose specialist) basically did a 180 of the filter adaptor and hugged the block, the went to braided as the wrapped around the front of the motor to the front crossmember mount
Stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Fifty50Plus · Posted: Fri Dec 16, 2011 11:03 pm Post subject:

I haven't tried a fit yet on the 924 but I've been real happy with First Gen Mazda RX-7 oil coolers on my 911 race cars. They come stock with dash 10 fittings and a built in thermostat. I cut the fitting end off the coolers, remove the thermostat, weld in a blocking plate and then put dash 12 fittings on. This makes it a full flow cooler and it can handle the heat load of a full race 2 liter 911 or improved over stock 2.4 liter engine. Cooler is about 24 in. X 5 in. X 2 in. with mounting ears on top and both feeds on the passenger side as mounted in the front of the car. They can be had for cheap at some dismantlers.
I'm thinking for the 924 that I won't have to remove the cooler thermostat or change the fittings - just bolt it on.
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

Joes924Racer · Posted: Sat Dec 17, 2011 5:22 am Post subject:

........the rx 7 coolers can be found on speed daddy . com for next to nothing.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.