Oil radiator on C5

406 V6 · Post by **406 V6** » 13 Apr 2005, 15:41

Hi!
Guys, i'm thinking in fitting an oil radiator on the C5 after tuning the engine (138BHP and 285Nm).
I have these suppliers:
http://www.lugo.pt/mocal.htm
http://www.lugo.pt/tabela_moacl.htm
Fisrt row is number of rows, the height, capacity and weight.
Which do you advise?
Thank you

Kowalski · Post by **Kowalski** » 13 Apr 2005, 17:36

My Dad had a Lancia Thema 2.0 Turbo 16v, it had an oil cooler but it wasn't very big at all, and that was on a 200hp petrol engined car. I think a small oil cooler will be all that is required, the sump tends to act as an oil cooler in any case.
I've heard it said that for towing, its a good idea to remove the undertray on Xantias to keep the temperatures down to manageable levels, perhaps the same would be true of the C5. The HDI already has an oil cooler built into the oil filter housing so perhaps putting a thermostat with a lower temperature opening would be more appropriate than fitting an oil cooler.

406 V6 · Post by **406 V6** » 13 Apr 2005, 18:30

Hmmm... i don't do towing, it's more thinking about the hot summer that's coming and the higher loads imposed on the oil due to a bit more power.
I found no cooler built into the filter housing, but the sump seems to have fins for cooling.
Regarding the thermostat, is it easy to fit a different one on the HDI?
I inspected the engine bay, and perhaps a good spot for the oil cooler would be behind the intercooler, since the air passing through it won't be very hot.
Another thing, what type of screw is the oil filter housing? I've heard of several types, M20 or something like that and UNF...[?]
Thanks as always

ActivaV6uk · Post by **ActivaV6uk** » 13 Apr 2005, 18:41

there will be a sandwitch plate on the HDi you can find it by tracing back the 2 water popes that go to the oilfilter. This is a good system and really shouldnt need any improvement unless the oil is getting very hot.
Andy

fastandfurryous · Post by **fastandfurryous** » 13 Apr 2005, 18:46

it's actually a fantastic system, as it performs two functions. Not only does it keep the oil at approx 10 deg C above the coolant temperature, but during engine warm up, it uses coolant heat to get the oil up to temperature faster. I noticed this with an old 1.9 N/A diesel in my Horizon Years and years ago. I towed a lot, and so fitted the cooler from a scrapped 405. Not only did the oil run somewhat cooler than before, it got up to temperature faster. The Heat exchancing capacity of one of these (inter)coolers is massive, and should be able to cope with just about anything you can throw at it.

406 V6 · Post by **406 V6** » 13 Apr 2005, 18:46

Ah yes! I noticed that!
I was a bit intrigued and thought i could be that the oil pump and water pump were on the same housing... Stupid me![:P]
Well, sorry all for this post. We're always learning.

Kowalski · Post by **Kowalski** » 13 Apr 2005, 18:57

The oil cooler that is an oil water cooler that is built into the filter housing uses cooling water from the radiator.

Post by **Thunderbird** » 13 Apr 2005, 21:34

My tuned Xantia HDi works well with standard cooling system, except on very hot summer days; sports driving; or while driving in the city (waiting for the light to go green...).
Turning on the Air Conditioning activates the two fans and brings the coolant temperature down quite fast.
I think Kowalsky idea concerning the thermostat sensivity is a very good one. It should trigger the fans sooner.

Kowalski · Post by **Kowalski** » 13 Apr 2005, 21:45

Triggering the fans sooner isn't the answer, a lower opening thermostat would keep things cooler by opening the thermostat at a lower temperature, allowing more hot water into the radiator at lower temperatures.
You could be suffering from a clogged radiator, you could try giving that a good flush.