scootz
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| posted on 2/10/08 at 01:08 PM |
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Radiator / Oil Cooler
To bring you up to speed...
I'm using an Audi RS4 engine in my project and I don't have the space for an Audi RS4 'sized' radiator!
So, I was going to put 2 x decent sized one's (in either sidepod).
I was happy with this, but then started to think about the oil cooler. The standard RS4 oil cooler is a small unit that attached direct to the engine
and is linked to the engine-coolant plumbing system!
So... what kind of impact would it make having one coolant rad in one sidepod, and an equally sized mocal style oil cooler in the other one?
I appreciate you don't want your oil 'too cool', so would this be of any use in my desire to reduce engine temps, or should I just
stick with the OEM oil cooler and the twin-rads?
Hope this makes sense! 
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Mr Whippy
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| posted on 2/10/08 at 01:25 PM |
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fit a thermostat to the oil line near the engine, think your going a bit ott with the oil cooling btw
think you should as you say just stick with the OEM oil cooler and the twin-rads
[Edited on 2/10/08 by Mr Whippy]
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scootz
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| posted on 2/10/08 at 01:36 PM |
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Cheers Whip Old Bean!
I just wasn't sure what the bearing of the oil-cooling was on the overall engine temp! I.e. - Less rad + More oil-cooling = same results as
More rad +Less oil-cooling!
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02GF74
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| posted on 2/10/08 at 01:52 PM |
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quote:
Originally posted by scootz
The standard RS4 oil cooler is a small unit that attached direct to the engine and is linked to the engine-coolant plumbing system!
What exactly do you mean by that?
Are you saying the oil and radiator coolers are part of the same radiator, e.g. on Range rover or the oil is water cooled?
So... what kind of impact would it make having one coolant rad in one sidepod, and an equally sized mocal style oil cooler in the other one?
The radiator is not there just to cool the engine but to maintain a specific operating temperature range typically around 90 degrees. The
engine is optimised to run best and realiably at those temperatures, exceed them and bad things happen. Cooling oil has less of an effect since the
cylinders jackets contain water and not oil, and most cars don't have oil coolers.
I appreciate you don't want your oil 'too cool', so would this be of any use in my desire to reduce engine temps, or should I just
stick with the OEM oil cooler and the twin-rads?
What I think I am trying to say is you should ensure that your water cooling system is as good as it was in the original car; same area of
radiator with same core thickness and fin count and then start worrying about the oil cooler.
I am not saying I am right, but that is the approach I would take; so two water radiators in pods would be the way I would go. Just noticed
McWhipster is saying the same so I must be right then!  Yes I know it is the more expensive option .... but it usually is like that 
[Edited on 2/10/08 by 02GF74]
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scootz
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| posted on 2/10/08 at 02:03 PM |
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No... I'm pretty sure you're both right!
The original RS4 oil cooler serves an engine that's pushing double the weight of my project, so logic tells me it should cope just fine!
Twin rads it is then!
Not much difference in price... the OEM Audi oil cooler is a good bit less than a Mocal aftermarket jobbie, so offsets the cost of another rad!
Anyone recommend a decent rad manufacturer that will make an Ali one to your own spec (and not charge the earth!).
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procomp
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| posted on 2/10/08 at 02:28 PM |
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Hi. Remember that water cooled oil coolers also warm the oil up to a working temperature also.
As for rad manufacturers theres only one i recommend and are usually the cheapest also Well cheaper than pace anyhow.
RADTEC
Cheers Matt
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scootz
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| posted on 2/10/08 at 04:46 PM |
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Thanks Matt
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dmac
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| posted on 2/10/08 at 06:59 PM |
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Too much oil cooling leaves the oil too thick to flow properly and you end up with too little cooling, if you don't want to use an oil/water
cooler then you could have a small oil/air cooler behind one of your radiators, the smaller size will prevent too much cooling and the fact that it is
sitting in warm air won't stop it working.
Duncan
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Fred W B
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| posted on 3/10/08 at 08:49 AM |
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I would suggest using an oil stat in the routing to the cooler
Cheers
Fred W B
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
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