Oil temperature
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In the 13's at last!.. Just

I'm thinking about this right now as I really don't fancy buying an oil cooler before castle combe this weekend.

Could where we are measuring the temperature from be affecting the readings. For example, does anyone know the likely temperature gains as a result of the oil getting heated up as it moves through the pump. whereas I assume in cases where the oil temperature is read in the sump will be lower as more heat will have been lost through the coolent and radiation.

So what I'm basically saying should we all be reading the temperature from the oil filer housing rather then the sump?

Edited by minimole23 on 20th Sep, 2010.

Changed oil brands and the problem has abated. It would seem the valvoline stuff was found lacking.

Own the day

You Cannot compress a liquid

Consider where the oil galleries are in the block, if anything the oil would losse some heat before it reached the bearings.

Sump temperature will always be skewed as that is where the majority of cooling takes place. the most consistent and acurate oil temperature has to be somewhere after the pump, and if you have an oil cooler, somewhere after the oil cooler.

The 'right place' to measure oil tem could become subjective

Edited by Sprocket on 20th Sep, 2010.

If something is worth doing, it's worth doing half of.

On the van we measure the temp in the sump from the speedo housing. However I take the temp here as only a rough indication as I would expect it is only just covered in oil and will probably be getting the cooking hot oil from the turbo onto it.

If something is worth doing, it's worth doing half of.

I have not studdied thermodynamics or fluid kinnetics. I can however assure you that you cannot compress a liquid :) I can show you what is left of a compressor after it has tried just that

Ok, I did not mean compress, but surely the action of the oil getting smashed about going through the pump will increase the temperature. Should have worded that one better!

If something is worth doing, it's worth doing half of.

Even though you cannot compress a liquid, the temperature rises with pressure. I guess it should be easy to calculate how much 60psi increases the temperature PV/T=C

I take my temperature before the oil cooler. The reason for this is that this is where it's likely to be hottest. I like to know the max temperature. It'd be interesting to use two sensors for a time to get some facts, but brand of oil etc will likely affect the readings.

Thanks for the input guys.

I'll let you know what sort of temps I see once the oil has been changed.

For the time being, I'll just keep the runs short and let it cool down when it gets over 100deg.

In the 13's at last!.. Just

don't suppose there is a meat probe lurking in the kitchen drawer...
dipstick hole...

wipe it before you put it back though!

Great idea!

In the 13's at last!.. Just

wipe it... is that like dipping the wifes tooth brush in thinners before retuning it to the bathroom after using it to clean out your carbs?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

PMSL exactly like that!

Done a search just on curiosity about oil temps, mine on a hot day on a motorway with a lil bit of fruitful driving can reach 120, but normally sits 90/100... i have undercrown jets, no cooler, millers ctv 20w50 semi synthetic, temp taken from sump bottom rad end.. the oil is at around 1200 miles and is due a change, engine is at 4500 miles.. does this all sound about right and will the temp come down slightly on fresh oil?

I emailed millers about temps for ctv, I got one back saying its a good idea to change it after it breaches 110deg

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I have seen 110 with millers most days, so I had that vr1 stuff in there at the min, and it's working really well! It has made the box quieter.

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

Mine was sitting at 120 @60ish mph ( I forget exactly)
But over this it went through the roof lol 150odd before I could smell it
Oil cooler and another gallon of oil (cvt) cured it

Yes i moved to the darkside

Instagram @jdm_brett

Yep when it got hot on me I could see the oil pressure start to drop slowing down on the motorway cured it... I run a dinky small cooler now but have t tested it yet

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Good to see I'm not the only one who searches oil temperature!
The last few days I've been seeing higher oil temperatures - today going to/from work (~55 miles each way, motorway work) in my 1330 MPI (2.9FD sitting at 3500rpm, about 70mph-ish) the temperatures been sitting steady at 110 (yesterday), 120 (today). I think the oil take off on the MPI is the front of the block (brown electrical connection).
Normally it's been steady at 85 (first mark on the standardoil temp gauge).
I rebuilt the engine last year after a cracked piston and have done about 7000 miles since.
I use the Halfords Classic (20/50) oil in the green can, and have for years changing ever 3000 miles(on re-build crank only needed a polish).
Should I fit a cooler? Would I need to take off/bypass in winter? Do I need to try another oil?

On another subject (still mentioned in this thread), on first rebuild the engine didn't use any oil. Now I'm going through a litre every 1000 mile or so (possibly a little more). Should I be worried? Have I done something wrong on rebuild? Just about to start a similar spec build for the Marcos in the next couple of weeks and don't want to repeat any mistakes.

Thanks

Probably down to the outside temperatures being mid to high 20s today.

I'd worry if I seen my oil temps peak at 110c never mind breach it.

On motorway cruising its the gearbox that's working the oil hot since the engine is not anywhere near full load.

Oil temps should be near coolant temps for good lubrication (maybe 10 or 20 degrees warmer if you use a 75 stat)

Oil temperature in the sump is an average, the temperature at the bearing journals and gear teeth are significantly higher, to the point where if you already see sky high sump temperatures chances are the oil will scorch. I've seen and smelt the results. The oil smells burnt and is very black after only 1k miles