V2Rocket

i cannot say for certain the orientation of the hoses at the cooler, but the pictures all suggest flow from the top down.

my comments are only certain for the ports on the engine.

but IMO, i don't think it matters. though i would continue running your cooler in the direction it has been running since the cooler gets oil before the filter, so it's acting as a first stage filter of sorts.

plumbing it backwards could dislodge any material stuck in the cooler matrix and send it into the actual oil filter (or the oil filter bypass in certain circumstances), feeding your engine with shrapnel.

PF

Thanks yes it sure seems Porsche fed the oil from the top on the OEM setup.
I will not use a 951 cooler. I am building a 968 Turbo S replica and I am copying Porsches setup on those cars with twin coolers. They used a stock 968 cooler on the passenger side and 968 tiptronic cooler on the driver side. See pic of my car attached.
I have not yet found any pics of a factory 968 Turbo S oil line setup but just how they mounted the coolers which led me to this predicament with flow direction.

I will now feed the bottom port of the 968 cooler from the left port on the housing and then let it exit the cooler on the top of the cooler. From there I will lead the oil

to the bottom port on the 968 tiptronic cooler on the driver side and finally a new line from the top of that cooler to the port by the oilfilter IE return fitting. That seems correct ?

V2Rocket

since you have freedom of design i would plumb the dual coolers parallel rather than in series.
double the cooling capacity and less pressure drop.

series plumbing would be somewhat less than double the capacity of a single cooler because the delta-T of the secondary cooler is lower.

PF

Ok interesting, how would I do that? I do not want to move any of the coolers position.

V2Rocket

instead of:

engine->cooler->cooler->engine

you use 2 "tee" fittings.

PF

Ok thanks! Does the length of the lines too and from the coolers to the "T:s" have to be aqual length? Would be easier and look better if that didnt matter so the T:s would be on the same side as the filter housing and a nice neat routing could be made.
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V2Rocket

Itd probably be ideal but not practical as hose is sold by the foot, and you'd have to loop it back on itself to package, probably.

PF

Ok thanks everyone for your input.

Seems settled that the pressure connection on the housing is the left on the pic I first posted and the connection next to the oilfilter is return from the cooler.

MAGK944

V2Rocket

Mike,
Terms are mixed but in this case "pressure" can be read as "hot oil".

There was confusion whether the oil flows into the top or the bottom port of the stock cooler.

PF

Yes its confusing isnt it! But just to clarify.
I read everywhere that you need to feed your oilcooler from the bottom to get the correct cooling effect!? Since I am building a 968 Turbo S replica I want to do it as Porsche did on the factory cars. However I have not been able to find info on how they fed the twincooler setup these cars had but my guess is that they were connected in series. In order to feed the oil to the bottom connection on the cooler I needed to know from wich connection the oil is coming from on the housing. That clears why I asked?

After this though there seem to be different opinions on which connection oil flow is coming from and to which port Porsche fed the stock cooler and also the importance of the question all together?

I am in no way an expert on the topic which led me to the question first hand.

My summary of this thread is pressure side is the left connection on the housing and return is next to the oilfilter. Porsche did not feed the stock cooler from the bottom but from the top and it seems that it really does not matter anyhow! Confusing enough

H.F.B.

Remember? --> https://rennlist.com/forums/968-foru...l#post15076676

MAGK944

V2Rocket

...so then why does your radiator take hot water at the top and put out cooled water at the bottom....
...or AC condenser for that matter.


AFAIK the "oil cooler from the bottom" is purely for pushing air out of the system.

gruhsy

There was a post by Michael Mount regarding the proper orientation of fittings on an oil cooler. Search for it on here and he mentions the reason for the proper way I believe. I do not remember what the specific detail was off the top of my head.