Hi Guys. Ive built a pbmw car, with a 1.8 m40. we have an oil temp sender mounted in the sump, which can read as high as 120 degrees during a race. Im assuming the sensor is reading correct, we havnt got a baffled sump due to its small size round the pick up im not sure baffles are necessary, so again am assuming the sensor is measuring oil as it is fitted as low as possible in the sump.
we are permitted to use oil coolers, but im not sure where to get a take of plate from. I have youtube searched 'e30 318is supercharged' and there is details of a build that uses a remote mounted oil filter and red take of plate. Does anyone know the company that manufactures them? I would copy the link to the vid but honestly dont know how to do it!
Any help would be great.
Many thanks.
Jon.P
Oil cooler.
Moderator: martauto
Indeed, Rix 313 is your man. He has one on his M42 IIRC.
BTW, baffles are a good idea to prevent oil surge. I have concentric aluminium cylinders around my oil pickup. Holes through the cylinders allow oil to flow through and meet the demands of the oil pump, but prevent the oil from sloshing about while cornering at speed.
Jon, I suspect that you are using a Siemens/VDO 120'C temp sensor (323-801-005-001D) on your sump. If so then be sure that you are using it with a 120'C guage (which is actually a water temp guage iirc?). If you use the 120'C sensor with the Siemens/VDO 150'C oil temp guage then you'll get the wrong temperature reading. Rather use the 150'C temp sensor (323-801-005-001D) with a 150'C oil temp guage (310-030-003C) as it's not unknown for oil temps to climb as hot as 130'C. So long as the "nose" of the the temp sensor is in contact with the oil (usually about half way up the sump bowl) you'll get a good reading. This requires the mounting of a bush with a 1/8"x27tpi NPT threaded hole for the temp sensor to screw in through. The sort of thing where the temp sensor is mounted "on" the sump (rather than through it into the oil) will measure lower than the actual oil temp. Although, TBH, if your oil cooler is connected in line with a remote oil-filter, then your engine is being lubricated with cooler oil than what is in your sump anyway, in which case you might do better to fit your oil temp sensor to the outlet side of your oil cooler.
Best of luck,
Geoff
BTW, baffles are a good idea to prevent oil surge. I have concentric aluminium cylinders around my oil pickup. Holes through the cylinders allow oil to flow through and meet the demands of the oil pump, but prevent the oil from sloshing about while cornering at speed.
Jon, I suspect that you are using a Siemens/VDO 120'C temp sensor (323-801-005-001D) on your sump. If so then be sure that you are using it with a 120'C guage (which is actually a water temp guage iirc?). If you use the 120'C sensor with the Siemens/VDO 150'C oil temp guage then you'll get the wrong temperature reading. Rather use the 150'C temp sensor (323-801-005-001D) with a 150'C oil temp guage (310-030-003C) as it's not unknown for oil temps to climb as hot as 130'C. So long as the "nose" of the the temp sensor is in contact with the oil (usually about half way up the sump bowl) you'll get a good reading. This requires the mounting of a bush with a 1/8"x27tpi NPT threaded hole for the temp sensor to screw in through. The sort of thing where the temp sensor is mounted "on" the sump (rather than through it into the oil) will measure lower than the actual oil temp. Although, TBH, if your oil cooler is connected in line with a remote oil-filter, then your engine is being lubricated with cooler oil than what is in your sump anyway, in which case you might do better to fit your oil temp sensor to the outlet side of your oil cooler.
Best of luck,
Geoff
"It is amazing how many drivers, even at the Formula-1 level, think that brakes are for slowing the car down." - Mario Andretti
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rix313
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I believe this is what you've seen 
:
I've now removed it because of the super charger bracket but it worked well. The only problem with it is it fowls with the alternator bracket (this wasn't an issue for me because I had moved it). I've got a kit here to move the alternator (pic below, note it is on the 'exhaust side') but I'm not sure what they PMBW regs would allow it.
Have you tried fitting an 'aircon' or 'tropical' spec radiator? The're bigger than standard will offer better water cooling and therefore hopefuly better oil temperatures as a result. Both the cars I've worked with in Kumho Tyres BMW (E36 318iS M42 and M44) have this and they do 20 minute races with no overheating issues.
I have some sump baffle plates here too that just need welding in should you want to baffle the sump
:I've now removed it because of the super charger bracket but it worked well. The only problem with it is it fowls with the alternator bracket (this wasn't an issue for me because I had moved it). I've got a kit here to move the alternator (pic below, note it is on the 'exhaust side') but I'm not sure what they PMBW regs would allow it.
Have you tried fitting an 'aircon' or 'tropical' spec radiator? The're bigger than standard will offer better water cooling and therefore hopefuly better oil temperatures as a result. Both the cars I've worked with in Kumho Tyres BMW (E36 318iS M42 and M44) have this and they do 20 minute races with no overheating issues.
I have some sump baffle plates here too that just need welding in should you want to baffle the sump
Last edited by rix313 on Tue Oct 26, 2010 10:39 pm, edited 2 times in total.
Hi guys, thanks for replies. sorry not answered quickly, have limited internet access!
Rix313, thats the one ive seen! Do you fabricate these yourself? if so what price do you sell them at? how much do they foul the altertnator? We cant move them with our regs.
Geoffbob, the gauge is a stackstackstack 150degree electrical with correct 150 degree sensor. it is mounted about 20mm from bottom of sump, through an adapter drilled and fitted to sump. the nose of the sensor protrudes about 10mm through adapter. I initially thought maybe the sensor is measuring air at times. But the oil must be surrounding the sensor alot of the time, as the pick up is higher than the sensor and we never see the pressure gauge fluctuate.
The oil we are using is mobil1 10 50 motorsport. the car is fitted with a sump gaurd, but the oil temp was high before it was fitted. we have holes cut into gaurd and a cooling duct fed to sump from n/s bumper.
Thanks agian for replies.
Jon.
Rix313, thats the one ive seen! Do you fabricate these yourself? if so what price do you sell them at? how much do they foul the altertnator? We cant move them with our regs.
Geoffbob, the gauge is a stackstackstack 150degree electrical with correct 150 degree sensor. it is mounted about 20mm from bottom of sump, through an adapter drilled and fitted to sump. the nose of the sensor protrudes about 10mm through adapter. I initially thought maybe the sensor is measuring air at times. But the oil must be surrounding the sensor alot of the time, as the pick up is higher than the sensor and we never see the pressure gauge fluctuate.
The oil we are using is mobil1 10 50 motorsport. the car is fitted with a sump gaurd, but the oil temp was high before it was fitted. we have holes cut into gaurd and a cooling duct fed to sump from n/s bumper.
Thanks agian for replies.
Jon.