oil cooler

[silver123]

I hear something about that diesel engines have oil coolers, beside radiator(water cooler).

I know that oil cooler has sports engines, but I really don't see the point to have it on common engine.

So is my hearing correct and diesels have oil cooler and why?

I gues that if they have it has to be something with commpresion ratio, because combustion temperature of diesel is even lover than gasoline.

 

[Tall-Paul]

I would like to know where mine is because the oil temp gets quite hot sometimes so i think it needs checking over. Does anyone know?

 

[Viking]

Oil cooler (if fitted) is underneath the oil filter.

 

[silver123]

so it really isn't like for the AC or engine radiator, which are fitted infront of the engine, in the bummper?

So if I get it right the stock oil cooler is realy some ribs, not the reall cooler?

 

[UncleFester]

Yes - that's what the stock one is.

 

[daveyonthemove]

I thought it was located under the car below the drivers door area? Or is that something else?
I noticed it when i was down there looking at the new exhaust, but never payed it much attention.

 

[UncleFester]

That's a fuel cooler Dave

 

[daveyonthemove]

Ah, i knew it cooled something

 

[silver123]

so modern diesel engine has:
*engine radiator,
*ac cooler and
*intercooler
located in the bumper. The first (regarding to the air stream) is intercooler, than AC cooler and finaly the radiator.

Intercooler is somethimes located under the hood(bonnet), like with imprezas, or in one of the side of the bumper, like with VAGs.


So apart of these main liquid to gas heat exchanger, there are also:
*engine oil cooler (only some aluminium ribs attached to the sump(carter)),
*EGR cooler (where gas is cooled with engine water running throw EGR cooler),
*hydraulic oil cooler (also only a couple of ribs or curved pipes) and as you mentioned
*fuel (diesel) cooler.

HOpe I didn't miss any of it (for an ordinary stock engine withought automatic transmission, not race ones, that also have brake oil cooler and even shock absorber cooler)

Apriciate if someone also explain to me why need all of these cooler and does gasoline engines aslo has them.
I gues that turbocharger bearings are attached to the engine oil system, so they are also cooled with same oil and same oil cooler.

 

[UncleFester]

I wouldn't have thought it would be too much work to fit an extra oil cooler if your oil temperature is consistently too high?

 

[silver123]

I wouldn't have thought it would be too much work to fit an extra oil cooler if your oil temperature is consistently too high?

my audi 2.0 tdi is quite cool (when reading measuring blocks with vag com), even I didn't find any oil or other cooler.

The meaning of my question is for me to better understand the car cooling system. You can have that I have a bit technical curiousness.

 

[sssstew]

So apart of these main liquid to gas heat exchanger, there are also:
*engine oil cooler (only some aluminium ribs attached to the sump(carter)),

The engine oil is not cooled this way, as mentioned before its the big silver block directly underneath the oil filter container on the diesels (so in front of the engine, at its base) this has coolant pipes attached to it. Coolant is passed through to not only speed up the warming up of the engine oil but to also cool it at the higher temps. There is no air cooling involved in this process, although there would be some heatloss through the oil cooler casing it wouldnt be substantial.

All the extra coolers create a more efficient engine, emiting fewer emmisions.

 

[devonmikeyboy]

so modern diesel engine has:
*engine radiator,
*ac cooler and
*intercooler
located in the bumper. The first (regarding to the air stream) is intercooler, than AC cooler and finaly the radiator.

QUOTE]

my audi 2.0 tdi is quite cool QUOTE]

If you have a 2.0 TDI The first (regarding to the air stream) is AC radiator then FMIC then engine radiator. It`s a right ass about tit way of putting the car together as the AC rad warms up putting warm air onto the FMIC plus it also slows down the air flow to the FMIC. There is also no room to replace the stock FMIC with a larger one as ever thing is wedged so close together.

 

[Ad Lav]

My mate had a problem with his oil cooler on his Corrado G60 so now he has a Mocal oil cooler, works very well on his as his oil was reaching 120-140!

 

[silver123]

The engine oil is not cooled this way, as mentioned before its the big silver block directly underneath the oil filter container on the diesels (so in front of the engine, at its base) this has coolant pipes attached to it. Coolant is passed through to not only speed up the warming up of the engine oil but to also cool it at the higher temps. There is no air cooling involved in this process, although there would be some heatloss through the oil cooler casing it wouldnt be substantial.

All the extra coolers create a more efficient engine, emiting fewer emmisions.

so oil cooler is realy like EGR cooler on diesels. It is heat exchange device and the heat transfer medium is engine coolant (water). And this way you warm the oil faster and keep it at the safe temp. durring engine run? So engine coolant really transfer oil, egr and "engine" heat through radiator to ambient air.

Can you also tell me if the oil cooler has only diesels (and why) or also gasoline engines and what about fuel cooler.
Soory to make so much questions, but I also hearing people to say about some kind of fuel coolers. Guess that it is need on diesels, because of a high fuel pressure??

 

[sssstew]

yep your right in the first paragraph.

2nd paragraph - yes as the fuel pressures are much higher for the new PD engines and the plastic fuel tanks need the fuel cooled so it doesnt warp it.

 

[silver123]

yep your right in the first paragraph.

2nd paragraph - yes as the fuel pressures are much higher for the new PD engines and the plastic fuel tanks need the fuel cooled so it doesnt warp it.

is the fuel cooled after it leaves high pressure fuel pump (mean for common rail, as also VAG is leaving the PD tech) so it allows higher fuel density or on the return way to the tank?

I ll gues that there is no need to rise the fuel density as injectors can deliver much more fuel than necessary, but the high pressure is required to spray the fuel into fine mist.

 

[Viking]

Fuel is cooled as it goes back to the tank.

 

[muddyboots]

so modern diesel engine has:
.
.
*EGR cooler (where gas is cooled with engine water running throw EGR cooler),

I don't think all of the VAG TDIs have an EGR cooler.

My Ibiza didn't, and my Passat doesn't, although the Haynes manual suggests some Passat TDIs did have one (have a feeling it might have been the automatic gearbox models for some reason).

 

[Ibiza Evo 2]

I don't think all of the VAG TDIs have an EGR cooler.

My Ibiza didn't, and my Passat doesn't, although the Haynes manual suggests some Passat TDIs did have one (have a feeling it might have been the automatic gearbox models for some reason).

You sure...my ibiza FR "had" one