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Old 10-13-2020, 01:00 PM   #1
klr142
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Default Radiator's trans cooler for race car's engine oil?

On the General Leif Erland Cox is recommending we run an oil cooler, such as the 940 turbo oil/water cooler setup. We don't have a lot of room but it might be possible, the only issue is we already run an Accusump and have the oil filter relocated on the car. We just put a new 240/740 radiator in the car and I was looking at the transmission cooler fittings sitting there doing nothing and it got me thinking.

Has anyone plumbed engine oil to those fittings before? The diameter of those fittings is smaller than the other plumbing we use, so I wonder if that's going to be an issue. Obviously it's not designed for engine oil, but I am curious if it could work.
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Old 10-13-2020, 01:18 PM   #2
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I'm not sure what the internal geometry of that particular cooler is, but my shop mate was running an air to air trans cooler for engine oil cooling on his VW diesel. It created a 50psi pressure drop across the cooler at lower revs. So I'd recommend not going down to 3/8" hose for your engine oil

Bar and plate oil coolers are pretty cheap these days.
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Old 10-13-2020, 01:37 PM   #3
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Originally Posted by culberro View Post
I'm not sure what the internal geometry of that particular cooler is, but my shop mate was running an air to air trans cooler for engine oil cooling on his VW diesel. It created a 50psi pressure drop across the cooler at lower revs. So I'd recommend not going down to 3/8" hose for your engine oil

Bar and plate oil coolers are pretty cheap these days.
Pretty sure the transmission lines are 5/16:8mm , I tried to use it for a power steering cooler,. I can't remember why but I ended up with a stand alone PS cooler,
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Old 10-13-2020, 01:39 PM   #4
klr142
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Thanks guys!
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Old 10-13-2020, 03:15 PM   #5
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Trans oil cooler pressure is much lower then engine oil cooler pressure as well. That's something to also consider
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Old 10-13-2020, 05:30 PM   #6
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Why not use a RX7 oil cooler? Lots of Lemons racers use them.
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Old 10-13-2020, 05:45 PM   #7
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You will not get enough oil flow, 5/16" line, in the trans cooler. I run-10 lines on the V8 Wagon/remote filter, -8 on the MG'S also remote filters, and you will heat the coolant. I have a stand alone 15 row cooler on the V8 Wagon,11row on my MG Midget,11row on my MGB.
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Old 10-13-2020, 05:49 PM   #8
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Hit the yard up in the ford vans or f250 trucks. They have good oil coolers and -10 size.
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Old 10-13-2020, 05:54 PM   #9
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factory 240 turbo oil coolers are pretty nice units.
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Old 10-13-2020, 06:12 PM   #10
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Why not use a RX7 oil cooler? Lots of Lemons racers use them.
I have used those and both models when I used them had a massive pressure drop across them
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Old 10-14-2020, 04:21 PM   #11
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Had a rx7 oil cooler with thermostatic sandwich plate for oil cooler and a doral air to air trans cooler. The fittings are -5an on the trans I think. I had a thread on the bookmarked and it’s mentioned in my build thread. 10an hose for the oil cooler and 6an hose for the trans.

I always had good oil pressure. 25-30psi at idle and 40+ while driving.
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