[flwbyu]

I have recently found out that my oil cooler is leaking and might need to be replaced. I was wondering if I should just replace the oil cooler with an OEM one or look at a third party alternative. I am slowly building my street/track car and was just curious as to what people thought about this issue. <img src="/forum/images/smilies/968/mellow.gif" class="smilie" alt="" />

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[flash]

looking into this myself too - i want a bigger one - my oil temps get up to about 245 or so hard running - too warm for my tastes

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[S_Cal968]

[quote name='flash' date='Oct 31 2005, 02:48 PM']my oil temps get up to about 245 or so hard running

[right][post="11929"]<{POST_SNAPBACK}>[/post][/right][/quote]



245! That doesn't sound right. Are you sure your gauge is accurate/calibrated?

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[Greimann]

[quote name='flwbyu' date='Oct 31 2005, 02:15 PM']I have recently found out that my oil cooler is leaking and might need to be replaced. I was wondering if I should just replace the oil cooler with an OEM one or look at a third party alternative. I am slowly building my street/track car and was just curious as to what people thought about this issue.  <img src="/forum/images/smilies/968/mellow.gif" class="smilie" alt="" />

[right][post="11926"]<{POST_SNAPBACK}>[/post][/right][/quote]



One alternative to consider is when needing extra oil cooler capacity is the Tiptronic cars have a trans oil cooler on the left side, same position behind the grill. A slick setup could be obtaining one of those to add to the system.

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[flash]

pete - prettys sure - normal is 205, same as dave's - if i am really on it, on a hot day, at 7000 ft, it has gotten up to 245 or so - not as high as a couple of other cars i had (265), and not the deadly 280 zone, but definitely higher than i want

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[flwbyu]

One alternative to consider is when needing extra oil cooler capacity is the Tiptronic cars have a trans oil cooler on the left side, same position behind the grill. A slick setup could be obtaining one of those to add to the system.

I am not sure how feasible it would be to actually do this but it sounds like an interesting idea. It would be interesting to see if it helped or added more issues. <img src="/forum/images/smilies/968/unsure.gif" class="smilie" alt="" />

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[sasilverbullet]

It's fairly easy with the correct lines and fittings to add an oil cooler anywhere you want. My friend and I added two oil coolers way up front to a super beetle back in 74. We used aircraft grade oil lines and fittings. Never had a drip...



One thing to consider is actually making the oil 'too' cool - it is possible to add too much cooling if you drive in a colder climate area.

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[968cab]

[quote name='sasilverbullet' date='Nov 2 2005, 01:13 PM']  One thing to consider is actually making the oil 'too' cool - it is possible to add too much cooling if you drive in a colder climate area.  [right][post="12023"]<{POST_SNAPBACK}>[/post][/right][/quote]



You can probably add a thermostat. My '73 911 had an oil thermostat as standard equipment, so I know the technology is available, and possibly better than 30 years ago.

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[flash]

i believe there is already a thermostat in there - i seem to remember dave telling me that

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[Greimann]

The oil system does have a thermostat. It seems to be set at about 200 F.

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[Jason Judd]

First, let me start out by saying that I have the stock oil cooler setup...and also keep in mind I have put in a turbo.



At my most recent DE event this past weekend, up at Watkins Glen, my oil temp never got over 210. The air temp got up to around 65 on the second day and still the oil temp never went over 210...maybe I was taking it too easy? Probably not, though.



My water temp got as high as 240. Now, I have a larger radiator which I purchased from Heritage Motorsport. I also removed the a/c system, too.



I have put in separate gauges for oil temp, water temp, among other gauges...so I know the readings are accurate.



My thoughts on this tend to make me more interested with the radiator's cooling. Because we have the advantage of water surrounding more of our engine than oil, I feel that the radiator plays an important job in bringing down the oil temperature, too.



I would look to improve the radiator's cooling capacity before I went to the improve the oil cooling.



Once I put in the Heritage radiator, my temps dropped dramatically. That was before I removed the a/c system, too. By the way, there was no modification needed to put in the larger Heritage radiator.



I believe you will cure your oil temp issue and also greatly improve the rest of your engine cooling.



Jason

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[flwbyu]

Jason,



The problem that I have is two things -



1. I live in arizona where the average summer temperature can be 110 to 115 degrees. So, it gets hot and stays hot. My temperature gauge during rush hour in the summer spends its time in and out of the red zone. <img src="/forum/images/smilies/968/ohmy.gif" class="smilie" alt="" />



2. It's a daily driver and I need to have the AC in the summer. I am also planning on adding a turbo down the line but I will still want the AC regardless.

My thoughts on this tend to make me more interested with the radiator's cooling. Because we have the advantage of water surrounding more of our engine than oil, I feel that the radiator plays an important job in bringing down the oil temperature, too.

I think this is an interesting idea as well and something I have considered. I did add a larger radiator to my 944 but is still ended up overheating and losing its guts all over the road. I just know that right now temperature can be an issue during the summer months and I am looking for ways to reduce this problem.

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[flash]

jason - wow - that's a complete reversal of how my car runs - i never see over 210 on the water, but can get up there on hot days on the oil



hmmm - looks like some investigating to do

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[Greimann]

[quote name='flash' date='Nov 3 2005, 04:55 PM']hmmm - looks like some investigating to do

[right][post="12079"]<{POST_SNAPBACK}>[/post][/right][/quote]

Consider the possibility that your Cancun oil filter is reducing flow through the system. Since it does not have a bypass, it may be a significant cork in the flow through the cooler. Typically, stock type oil filters bypass at about 8 to 10 PSI allowing full volume to through the rest of the system.

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[flash]

hmmm - so, your thought is that i no longer have the unfiltered oil going on through the system?



i never thought about it before, but with that kind of bypass, and the pressure being considerably higher, how much of the oil actually gets filtered, and how much just goes on past?



sounds like a phone call tomorrow

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[Greimann]

[quote name='flash' date='Nov 3 2005, 07:10 PM']..., but with that kind of bypass, and the pressure being considerably higher, how much of the oil actually gets filtered, and how much just goes on past?

[right][post="12083"]<{POST_SNAPBACK}>[/post][/right][/quote]

The majority of the oil in a stock system bypasses the oil filter. That is not to say that none goes through the filter. When the bypass valve cracks at 10 PSI, some oil sill goes through the filter but most goes past un-filtered. This is known as as a kidney loop system. It is a very valid filtration scheme as the rate of recirculation effectively filters the full volume of oil in, - this is a guess - 5 to 10 passes. Considering the flow rate of the oil pump, you still get full filtration many times per mile.



With the Compton filter (no bypass) , the full volume goes through the filter every time, inhibiting the oil pump from delivering it's full potential to the system.



The filtration beta ratio is great, but the reduced volume may cause other problems.

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[flash]

cancun, compton - i get the joke



again, sounds like a phone call to be made tomorrow

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[flash]

ok - got some more info



the canton racing filter flows 15 gal/min unrestricted - anybody know the stock rate off the top of their head?

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[Jason Judd]

Good info, Flash.



Sorry I don't know what the stock flow rate is.



15 gal/min doesn't sound like a bottle neck, though.



Jason

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[Brian]

i'm not an auto engineer, so be nice....



the coolant and the oil both flow through the block, right?

both have a radiator of sorts.

why are they not the same temperature?

i know it's two different materials entirely, oil and water/coolant. but once the engine gets to temperature for a while, shouldn't it all be the same temp?



just curious.

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