skidude88
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| posted on 20/6/07 at 11:13 AM |
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Oil Cooler
Back from a rather wet Le Mans 
Having spent ££'s on new oil lines, connectors new mocal oil cooler etc... she's now getting a tad hot on motorway runs.
A couple of minutes over 70mph, oil temp is creeping up past 110 to around 116.
Sat in traffic she seems fine.
Oil cooler is sat behind main rad, which obviously isn't good... but where else on an MK?
I've looked through old posts and some say to fit it up against the main rad (obviously in front)
My fans on the front, and pretty sure its not gonna be possible to install it behind.
I gather ducting air onto the cooler isn't particulaly good either.
Anyone have any suggestions?
Bummer is the old engine and setup had a load of problems, but oil temp wasn't one of 'em, the new oil cooler is approx the same area as
the old one (115mm with 19 rows).
I was wondering if perhaps the oil cooler isnt full of oil and working to 100%? tryna fig out how it all works?
The cooler is higher than the sump/oil level.
Looking at Think Automotives section diagram - the cooler rows are individual (rather than one continuous one)
If you have a cooler higher up than the sump oil level, what ensures the whole of the rad is used?
Cheers,
James (starting to dry out)
Early MK de-Dion CBR1000 FJ-FP.
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Fred W B
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| posted on 20/6/07 at 11:24 AM |
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Is the oil cooler mounted with at least the outgoing, or both, connections at the top?
[Edited on 20/6/07 by Fred W B]
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skidude88
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| posted on 20/6/07 at 11:43 AM |
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Er....Mmmm....
Mounted the cooler the same way up as the original.
...with connectors at the bottom.
Is that obviously upside down?
Guess I'll look and see if "top" is blatantly shown on it!
Early MK de-Dion CBR1000 FJ-FP.
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Pants On Fire
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| posted on 20/6/07 at 12:10 PM |
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Mines under the battery plumbed around the bottom chassis rails and fitted vertically with the inlet uppermost and return at the bottom.
13 row Mocal fits perfectly between top of scuttle and bottom chassis rail for easy fixing.
Maintains a constant 60 - 70 psi on any run and no ducting.
Yes, I am an agent of Satan, but my duties are largely ceremonial.
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Rob Palin
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| posted on 20/6/07 at 12:17 PM |
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I don't think 116degC is too high for oil. For water, sure, but oil should be ok to 130ish, especially seeing as you'll probably change
it after much fewer miles than you would a normal tin-top.
Bearing i mind that it has a higher limit than the water, it's not as bad as you'd think to have it behind the radiator as you've
still got a reasonable temperature difference dictating the heat loss. Have it the other way around and you'll probably be putting heat *into*
the radiator.
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02GF74
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| posted on 20/6/07 at 12:49 PM |
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quote:
Originally posted by skidude88
Er....Mmmm....
Mounted the cooler the same way up as the original.
...with connectors at the bottom.
Is that obviously upside down?
the inlet .outlet should be on the top or esle mounted side ways - sounds like yours is upside whcih may give air locks.
the height deosn't really matter sas long as you oil pump can pump oil to that height - oil get to the rockers so if you cooller is lower than
that, whcih it will be, then that is not so a concern.
long hose runs of small diameter do not help - you should be using at least 1/2 in and if it is far away, then consider going up a size - 5/8 in being
next size up.
116 for is is not bad, you want it to be over 100 to boil off any water.
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skidude88
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| posted on 20/6/07 at 12:49 PM |
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I figured around 115-120 would be more a temp to expect when loud pedal was down flat?
Looking at the threads here, tootling @ 7ks most are sub 100 degs.
Wouldn't have thought it would be doing the oil any good going much higher.
[Edited on 20/6/07 by skidude88]
Early MK de-Dion CBR1000 FJ-FP.
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skidude88
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| posted on 20/6/07 at 01:07 PM |
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Cheers for hose info.
Using -8 connectors.
Just tryna find what that is in old money.
The new hose is smaller dia than the original, but the whole run (in and out) only used about a meter of hose.
Mounting it the other way up (o-er missus!) seems the next easiest option to try.
More connector £'s
Early MK de-Dion CBR1000 FJ-FP.
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awinter
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| posted on 20/6/07 at 01:34 PM |
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He lives!!
glad to have you back!! Are you out tonight?
Mount it the other way up and try to avoid air bubbles you could try to pre fill the cooler with oil which may help.
Al
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Fred W B
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| posted on 20/6/07 at 02:16 PM |
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-8 is 1/2 " or 12. 7 mm
The fact that lots of cars and bikes, even OEM's run coolers with the ports at the bottom does seem strange to me. If you wanted to fill your
cooler with water, would you hold it in a bucket of water with the ports at the bottom, or the top?
cheers
Fred W B
[Edited on 20/6/07 by Fred W B]
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ChrisGamlin
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| posted on 20/6/07 at 04:59 PM |
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I suspect its a positioning issue as much as anything. You say the cooler is behind the radiator and from other comments I assume its not hard up
against the back of the rad? If its not hard up against the back of the radiator though it won't get very good air at all, so will likely not
work very well.
If you cant get it behind the rad can you not get a pull fan to put on the back and then mount the cooler on the front?
Maybe worth taking a pic of it so we get a better idea of its position?
[Edited on 20/6/07 by ChrisGamlin]
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chrisj
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| posted on 20/6/07 at 05:47 PM |
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I hung my oil cooler over the top front of the radiator, after brackets theirs an air gap but it doesn't block a lot of the air clean airflow to
the main core. Put the fan on the back and wire to be a puller rather than a blower, consider a pacet pro fan or one with a huge CFM. Prime the oil
cooler first so that it doesn't push a lump of air into the system when the thermostat opens at 80 plus.
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skidude88
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| posted on 21/6/07 at 08:14 AM |
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probably about a foot forward of the rad.
Early MK de-Dion CBR1000 FJ-FP.
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ChrisGamlin
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| posted on 21/6/07 at 03:34 PM |
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A foot behind the rad half way between the rad and the engine? If so, I think there's you're likely culprit because it won't be
getting any meaningful flow of air in the middle of the engine bay.
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