Engine Oil Cooler Thoughts (1 Viewer)

[SUMOTOY]

sorry I inadvertadly removed my pics by mistake. It was an earls oil cooler 6"x9"

scott I put a mocal oil thermostat on it. I agree that there are better ways to cool this motor from my experementing

When I first jumped into this forum, I was pretty convinced early on that the problem with 80's cooling was due to oil. Since february of this year, I've become pretty convinced that the problems with 80's cooling is two fold. They run cool too much of the time, and they run really hot when they get hot. Oil temps don't appear to be a problem until radiator temps are. Luckily this appears to be a more simple (though maybe not so simply discussed here) concept of heat management.

That transmission cooling circuit really adds a monster heat soak to the condenser, radiator and engine bay. I'm pretty convinced that following/including hood vents the main culprit to overheat engine temp problems are in that trans circuit. I'm also quite hopefull that the hardware toyota delivered is good and efficient (aux trans cooler) but just needs to be relocated.

Doing something about the in tank cooler might prove a bit more challenging.

Scott Justusson

 

[Rusty Phillips]

Oil coolers really should use 100C thermostats. I think these trucks run cool a lot of the time. Then when you put massive load on the transmission, the radiator gets heat soaked, sending temps way up.

My own thinking is time would be better spent on the trans cooler system, because it's most likely the heat source problem. My idle measures of 190+f on the inlet side of the aux trans cooler, indicates two things to me.

First, what is going into the bottom of the radiator is really hot if what's coming out is 190f at idle. Two, trans heat will eventually heat soak the radiator.

I bet the manual transmission guys don't share any of these problems. A radiator that only cools the engine, and no big heat exchanger blocking the DS of the radiator.

The rest of us need to get more creative. I haven't seen an actual oil temp measure in some time here, but big sumps usually don't contain super hot oil until radiator overheats. Then there is a lot of hot oil in the sump helping to skyrocket temps quickly.

The engine oil cooler is a good idea for a safety valve in case the radiator gets too hot. I would think addressing the trans temps and moving the trans aux cooler (even the in tank cooler in hotter climes) to help improve radiator and condenser efficiency.

Scott Justusson
QSHIPQ Performance Tuning
Chicago IL

Dont forget - the 3FE and 1FZFE engines both already have oil to coolant heat exchangers (oil coolers) already (on the passenger side of the engines)......

diagram of 3fe

pic of FZFE

Seems like you can spend a lot to u0pgrade the engine oil cooling system and not accomplish very much...... take steps to reduce radiator temps instead

 

[SUMOTOY]

Dont forget - the 3FE and 1FZFE engines both already have oil to coolant heat exchangers (oil coolers) already (on the passenger side of the engines)......

diagram of 3fe

Seems like you can spend a lot to u0pgrade the engine oil cooling system and not accomplish very much...... take steps to reduce radiator temps instead

Rusty:
That is very true, both engines have them. They are located under the exhaust manifold and use coolant as the heat exchanger. Givent the placement and method of 'cooling', I'd almost consider it a oil pre heater, not cooler, but I haven't seen any efficiency numbers off the unit. It certainly can help heat the oil when the radiator overheats tho!

As a rule large sumps have a large heat capacity for oil temperature variations. Take steps in heat management, may or may not include the radiator directly. I'm not at all convinced it's necessary to reduce radiator temps, only stabilize them during high load situations.

The common definition of high load, appears to be a stress of the transmission in terms of temperature conditions. If that's the case, it's really reducing trans heat and it's transfer into the radiator. The side benefit is easier management of radiator temps.

Scott Justusson

 

[alkaline747trio]

So would removing the auxillary tranny cooler, and relocating/adding a better one somewhere else be a good solution, or should I add a supplementary cooler ahead of the factory one?