Standard Oil Temperature operating range...

[RyleyMA61]

Can anyone give a good oil temperature operating range??

Since installing a gauge the 7M seems to sit between 85-95 deg. C with just boring driving, and even about 102 deg C. on a hot day, still no hard driving

I'm pretty certain that after 6 laps of winton the oil got hot and thin and therefore lost pressure (did have gauge at the time)

What sort of ranges and temperatures should I be looking at, and while i understand the viscosity of the oil effects the temperatures, does it effect the desired temperature range??

thanks,
ryley

[oldcorollas]

i think 120 and above is not good.. 130 is too hot...
95-105 is nto bad, as it will make sure the water and fuel evaporates out of it...
always 85 is probably a bit low?

just a guess

edit, i would think of it as temp affecting viscosity range, as opposed to the other way..
the oil will break down if too hot, and is designed to work around the 100-120ish temp (might be wrong here)... above or below the actual viscosity is different to what you chose...
some oils lose visvosity faster at higher temps tho

[RyleyMA61]

sweet man, thanks, that is spot on what im after

just noticed at the track oil pressure dropped fairly low, and letting the car cool would fix.... full flow oil cooler time

[Norbie]

Mine seems to sit around 210 F once properly warmed up (approx 98 C), haven't given it a proper flogging yet to see how far it creeps up though.

[oldcorollas]

this is interesting...
http://www.practicingoilanalysis.com...?articleid=475

oxidation rate doubles for every 10 deg above 75deg..

and thermal breakdown of oil needs to be around 200.... (bottom of pistons/rings?, cylinder walls? exhaust valve stems?)

http://www.elephantracing.com/techto...emperature.htm

Properly maintained 911 engines can last over 300,000 miles when oil temperature is kept in the optimal 180°-210°F range

[SuperDave]

I have been informed by Motul that their oil works best between 80 and 120*C. That said I see about 85*C on normal driving, close to 100*C on peak hour, and 110*C on the track. Thats with a 19 row Earl's fitted and blocked off on the street and using a thermostat. The cooler is knocking off about 10*C. I don't have any values before fitting the cooler to see how much it is helping.
Engine is a 2zz-ge by the way.

[TooF]

out of curisoity what motul oil was that for ?

[SuperDave]

It was a while ago so can't remember if I asked generally or specifically. If I asked specifically it would have been the 4100 Turbo lite (10-40W).

[TooF]

awesome thanks, i use the 4100 power 15w50

[abently]

Oil does thin with increase in temperature so ofcourse the pressure will drop.

The real synthetic oils don't breakdown as much at higher then normal Oil temps in comparison to the Group 3 & 4 Oils.

Thick oil costs power, too thin Oil will ruin your Motor........so its a balancing act.

How many of you are actually running shrouds on your Oil Coolers ?

[SuperDave]

How many of you are actually running shrouds on your Oil Coolers ?

I do, learnt that when winter rolled around.

[RyleyMA61]

as in a shroud like engine radiator or a full on sock-type warmer? like a beanie?

can anyone tell me how the "universal" oil cooler kits work? are they in fact universal? the sandwich plate that goes between the filter and the mount, such as the just jap kit... are they universal?????


thanks for all the help

[big_zop]

Universal generally means that the lines are very long to allow mounting in most locations and that the part that connects to the block has a thread that matces certain threads or has an insert that can be changed to suit. Most of the parts (brackets, oil cooler core itself) is quite generic and unless you get luck and its the right size for your intended location (say if you wana put it where a side mount used to be on a JZA80, etc) then there isnt much option for customisation.

Ive been trying to find one with termostatic control but cant seem to find anything cheap as this should hopefully alleviate the temp problems.

[trd3sg]

interesting thread -

can someone please shed some light around this shroud issue?

and secondly, who manufactures an oil thermostat - where and how would it be fitted?

cheers

[oldcorollas]

given that shroud usually refers to a covering between a radiator and fan to promote air being pulled through the radiator, i assume abently is assumin gthat everyone is runnign fans on their oil coolers??

or perhaps he meant ducting, to direct air to and away from the cooler and to seal air leakage around the care when it is not fan assisted.

but he can elaborate i'm sure.

both Mocal and Permacool do affordable thermostats.
they are fitted between the oil take off at engine, and the cooler.. basically, when the oil is cold, the oil short-circuits the cooler... and when warm, a wax pellet opens the valve thingy, and allows oil to go through the cooler.

they can either be full flow or return to sump.

if you have "radiator cooling to spare", then a water cooled/warmed oil heat transfer thing (like on 3SGTE) can be a good thing...
or.. a full flow cooler, and then going thru the oil/water interwarmer/cooler.... so the water regulates the oil temp...