as per title! i'm seeing nigh on 140 degrees when pushing it on the road, when i did my track day a few weeks back

by the third lap oil was almost of the scale whilst water temp was at 90 degrees, i have tried a spare set of clocks

and tested the sensor as well as flushing the system when i did the cam belt and water pump

Oil cooler will help but it shouldn't get that hot on the road it will cook it sooner or later

That's quite low, especially the 165 figure. In my book, anything over about 100 degrees is to be avoided, most oils really starts to loose performance fast above this temperature. You should really consider an oil cooler as essential kit on a fast road/track car.

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R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
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good point. my heat exchanger is still in place, normal driving sees approx 90 degrees but as soon as i using its

revs for any length of time the temp raises very quickly

Sorry but what Pete said about temperatures and the heat exchanger isn't right , whatever the oil temp is in the sump it will be the same temp oil pumped through the galleries to the bearings, cams, pistons etc. and its only going to get hotter as it goes through the engine drawing heat from the bearings and combustion process as it goes. It will cool slightly in the sump due to windage on the bottom of the sump pan, but not much. When was your last oil change? Using thicker grades of oil also masks underlying issues, it also places more strain on the oil pump and more importantly the oil pump drive chain (which has been known to break). As said the oil pump could be faulty, but I'd be interested to see what the condition of your water cooling systems like and wether or not your head gasket is on its way out.

________________________________________

R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars

Have you tried a different sensor / sender as I suspect a faulty reading ? 140 will kill an engine very quickly ?

Not wishing to start an argument but I'd be interested to know how the oil isn't any cooler after flowing through the oil cooler and filter?! The temp sensor is in the sump, then the oil is pumped up, through the cooler and filter and then into the main oilways, so surely it has to be cooler?

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Oulton Park in a BTCC 306 vid 1
Oulton Park in a BTCC 306 vid 2
Lap of the 'ring

i understand what your getting at mate

Ok I didnt word it as clearly as I could have, the heat exchanger primarily helps the engine warm up faster and is far to small and inefficient to remove much temperature from the oil in the dhoti time it takes for the oil to pass through it. How hot is the coolant in a hard driven car? 90-100 degrees? If 120 degree + oil passes through a 100 degree oil/water heat exchanger how much temp do you suppose it pulls from the oil passing through it? Not much would be my opinion, certainly not enough for it to be relied upon to save you from disastrous oil degradation. So yes Pete, you are right to a degree, it will cool somewhat, but not enough to make it count.

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R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars

Agreed, but my water temp usually sat around 90 unless it was a particularly hot day, and again, the water temp sensor is at the end of the block, reading the coolant at it's hottest. So in actual fact, the coolant is likely to be considerably cooler and will have a greater cooling effect on the oil than you may think.

This document shows the maxi's used a similar set-up but with a larger cooler. With no additional oil take offs visable, it would suggest it was the only form of oil cooling...

http://www.peugeotsport-store.com/cms/web/upload/documentation/110/4fd1e555e8e83.pdf (page 12)

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Oulton Park in a BTCC 306 vid 1
Oulton Park in a BTCC 306 vid 2
Lap of the 'ring

My touring car has a laminova one, so that is definately more efficient, but along side an air>oil cooler also. I think the laminova is there to aid engine warm up more than cooling. Having never seen a maxi one except in that diagram I couldn't say but I would expect a works rally car to run a pretty decent oil cooler, especially with the revs up at 11k or whatever they were.

I have no idea how efficient the road car one is but I never had oil temp problems on the road, and only on hot days had issues on track. I fitted a thermostatic sandwich plate type oil take off to an air>oil filter to keep it in check.

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Oulton Park in a BTCC 306 vid 1
Oulton Park in a BTCC 306 vid 2
Lap of the 'ring