Cooler on oil return?

[Unfalconbelievable]

Just wondering if an oil cooler would be more help on the pressure or return side of the turbo oil lines? And ive posted in the aussie section but does anyone here know the identification numbers for the EF OHC series engine? wanting to build a better bottom end engine for a bit more boost and heard the EF has better rods and crank

CHEERS

 

[addo]

The "used" oil would exchange more heat, but there is a risk perhaps of losing flow volume. Dynoed 250 should know where the ID can be found.

 

[StrangeRanger]

I may be wrong on this, but I was under the impression that the tubo could not survive if there were any significant back pressure in the oil return to sun. A coler would add some backpressure since heat exchange requires turbulent flow.

 

[rmt]

My old Mercedes 300 turbo-diesel has a good sized oil cooler (especially for a 183 cu. in. engine) that is supplied from the oil filter housing pressurized, and returned to a different part of the housing. From there it supplies the galleys and a separate external pipe that runs directly to the turbo. The hot turbo oil is drained directly into the pan via a tube of larger diameter than the supply pipe. No pressure after it's "done", just a wide open drain.

Along with the cooler ports, turbo port and bypass pressure relief valve, the filter housing also has a thermostat that begins to open the cooler feed line at 95°C (203°F), fully open at 110°C (230°F). Oil that is too cool is not good either.

The pistons are cooled by nozzles that squirt a stream of oil into one end of an annular ring cast inside the top of each piston. The oil just exits at the other end of the ring. The factory engine manual states failure will surely be imminent should one of the nozzles become plugged or it's orifice damaged.

On top of all that, the little engine also took 9 1/2 quarts to fill halfway between dipstick marks when I recently finished the rebuild. Could have put in 10. Takes 7 1/2 qts. at oil change, could put in 8. As in 2 gallons.

You could say the engineers took the oil system in this little engine very seriously, which probably goes a long way to explaining why they can last so long. Big cooler, big filter, big pump, big journals, lots of oil.

 

[Unfalconbelievable]

mmmhmmm ok i was only thinking of cooling the hot oil on return to help keep engine temps down not so much turbo temp but if its not good ill just have 2 hope my new 3 core radiator can help enough, yeah being a stock 4.0L non turbo i dont have provisions for for water cooled oil filter housings or a large capacity sump, the Z9 is a big filter tho. I do know what your talkin about for the water cooled side of things as i used to be a subaru technician working on WRX's n STi's and they have the very same thing.

 

[rmt]

The set up I explained helps both engine temp and turbo temp. The cooled oil goes from the oil filter housing to the main galleys and to the turbo.

The oil cooler is air cooled. The thermostat is in the oil filter housing, controlling the flow to the cooler, much like the engine coolant to the radiator.

The hot oil down in the sump isn't really hurting anything. It gets picked up, cooled, then sent on it's way.

 

[wallaka]

You could probably put a scavenge pump and put the cooler on the return line. A scavenge pump would give more flexibility with mounting also.

 

[XFlow_Fairlane]

I like the idea of a air cooler and water cooler combined. you run the oil through the air cooler first and then through the water cooler. if it is too from the air cooler the water will heat it up (this helps to keep the oil at a more constant temp) you would prob want an external filter for this setup though.

 

[kirkallen143]

I am running a oil cooler before the turbo. I see @ 60-70 psi when cold then about 40-50 psi when warm. The turbo makes the engine run at 205 degrees on a 98 degree day, and before w/out the turbo it ran @ 185 - 190 degrees (and did not have the oil cooler installed).

Kirk