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E34 (1989 - 1995)

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  #1  
Old 03-19-2013, 07:16 AM
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Newman271 Newman271 is offline
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Mein Auto: 85' 335i
535i radiator questions

So I'm doing a M30B35 swap in my e30. I noticed that the Auto trans radiator is a 2 row radiator with the trans cooler fittings built in. I noticed the manual trans radiator is a single row with no fittings which makes sense. My question is this: Can I use the Auto trans radiator and just adapt the built in trans cooler to a oil cooler? I heard some of the M30's come with a oil cooler, mine did not. I just wanna make see if anyone has done it? I wouldn't think the oil pressure would be any higher than trans pressure, so I think it would physically work but wanna get everyone's advice.

BTW, my M30 has a manual trans.

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  #2  
Old 03-19-2013, 07:23 AM
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BMR_LVR BMR_LVR is offline
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Very interesting question.

I don't know the answer (but it certainly seems plausible), but will be looking forward to see what those in the know have to say.

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  #3  
Old 03-19-2013, 07:36 AM
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Newman271 Newman271 is offline
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I just want to keep everything as cool as possible. I already have to modify my front frame rails to adapt the 5 series radiator so I figured I might as well modify it for the slightly larger radiator. I plan on running this engine pretty hard, so just trying to be careful.
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1999 540i M-Sport
Silver/Black
Still fresh and Minty

1985 335i
Black on Black coupe 5spd
R.I.P

1979 Trans Am 10th Anniversary
#16 of 5,683 made

KOI Import Parts-- 513-771-7777
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  #4  
Old 03-19-2013, 07:55 AM
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BMR_LVR BMR_LVR is offline
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Quote:
Originally Posted by Newman271 View Post
I just want to keep everything as cool as possible. I already have to modify my front frame rails to adapt the 5 series radiator so I figured I might as well modify it for the slightly larger radiator. I plan on running this engine pretty hard, so just trying to be careful.
I love the idea and concept of it. I really can't see why it wouldn't work, but again, there may be some reason that I'm not aware of. I'm not sure where your outlet and inlet oil lines would come from on the engine, but again, interested to see what others have to say.
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Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #5  
Old 03-19-2013, 08:24 AM
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ross1 ross1 is offline
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I don't see why not. Engine oil pressure is well below the pressures seen in the trans.
I don't know how much cooling you'll get as the temps aren't that different. You'll be adding capacity which is always a good thing.
Me, I'd go oil/air but this sounds like an interesting experiment.
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  #6  
Old 03-19-2013, 08:53 AM
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Newman271 Newman271 is offline
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My M30 had the oil filter housing on the side of the block.. it has the replaceable paper filter. It looks like my external housing has a bolt blocking a hole for a oil cooler connection.. Just not sure where to put the line coming from the cooler too. If worst comes to worst I could tap my oil pan for the return line.. I'd rather not but as of now looks like A option. Although it would have me one step closer for my turbo build next year..
__________________
1999 540i M-Sport
Silver/Black
Still fresh and Minty

1985 335i
Black on Black coupe 5spd
R.I.P

1979 Trans Am 10th Anniversary
#16 of 5,683 made

KOI Import Parts-- 513-771-7777
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  #7  
Old 03-19-2013, 08:32 PM
snowsled7 snowsled7 is offline
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Quote:
Originally Posted by ross1 View Post
I don't see why not. Engine oil pressure is well below the pressures seen in the trans.
I don't know how much cooling you'll get as the temps aren't that different. You'll be adding capacity which is always a good thing.
Me, I'd go oil/air but this sounds like an interesting experiment.
I do not think trans fluid in the cooling loop see's more than about 10-15 psi, engine oil pressure runs higher than that. I don't think the trans cooler is up to engine oil cooler duty. Consider that you can buy an aftermarket trans cooler for $30-40 but an engine oil cooler is at least double that.

Any specs on trans cooler line pressures?
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  #8  
Old 03-20-2013, 06:06 AM
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Newman271 Newman271 is offline
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Location: Cincinnati, OH
 
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So I called Spectra Premium, the company that makes the radiator I'm about to buy. They said their coolers built in radiators have a bursting pressure of over 150psi. I told them what I was planning on doing, and said that they have heard of people doing what I am doing.
So, I guess tonight im going to find out how to tap my oil filter housing for some lines to the radiator.
__________________
1999 540i M-Sport
Silver/Black
Still fresh and Minty

1985 335i
Black on Black coupe 5spd
R.I.P

1979 Trans Am 10th Anniversary
#16 of 5,683 made

KOI Import Parts-- 513-771-7777
Reply With Quote
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