Chads996

I have a monster 27" x 4" across the bottom of the spoiler. So far so good.

C.

Van

Chad, got a manufacturer or model # for that?

Chads996

I can get it. Give me a day or so.

C.

Flying Finn

+1

Isn't 993 factory race cars' coolers in series as well?

smlporsche

If you learned to drive it faster you wouldn't need such a big a$$ cooler

J/K

Time to take that thing to the track

Chads996

LOL

As soon as I work the bugs out, you bet. AC delete is coming ASAP, as well as fixing a oil leak (oil cooler lines, ironically). We used the wrong size hose.

C.

smlporsche

Cool.

Seriously, I would enjoy hooking up w/ you sometime this fall at a track and see how your beast runs against mine to determine if it's worth the upgrade.

Have you had the car dynoed or weighed yet? PM me if you would rather.

RedlineMan

Hey;

As Mr. Wayne mentioned, the stock cooler is a bit of a toy. More to fit the space than anything. Not much surface area when you get right down to it, but it does fit a small spot, which is nice.

Ideally, you would like to have any coolers present sitting in their own discrete air flow, meaning not in front of another one. It is not logical to subtract heat from one radiator only to add it to another, which is to some extent what happens when you stack them.

I would think that a very nice setup for a pure S2/T track car would be double fog lamp opening coolers plumbed in series. I don't have the size handy, but the KISS cooler is perfect, and is readily available. I would then duct the exit air out somewhere if you are running fender liners.

Larry Herman

Since this seems to be a 951 based thread, the best thing that we did to our 951 was to replace the radiator. The new one we bought has 50% greater capacity and keeps the engine temp perfect regardless of the outside temperature. IMHO no real need to upsize the oil cooler in a water-pumper if the motor stays cool already.

Van

OK Larry - got a brand or model # for the larger radiator?

RedlineMan

Prolly thisn... Not cheap, but works good.

Larry Herman

Yeah, that's the one.

A.Wayne

ON a 951 , the biggest cooler you can fit for track use , the cooler oil temp will bring down the water temp with the stock radiator .......

kurt M

random ramblings.

A well designed and plumbed parallel system will move more heat all else being the same. “all else” is a lot of things.
Both will produce increased temp drops that are close to the temp delta, surface area and air flow/temp numbers. Series positives, this method is simpler plumbing and you know all oil will flow through both even with a poor design. Down sides. Marked increase in flow resistance and the second cooler will remove less heat due to dropped thermal delta produced by the first cooler. As the oil temps drop in the cooler the amount of heat removed drops off too. The second cooler will be getting cooler oil.
Parallel positives. Less flow resistance from coolers themselves. Slower oil speeds coupled with longer contact time in the coolers and higher thermal deltas in both coolers can remove more heat than series.

It is all about moving total BTUs. Not just in and out temps on the cooler. Slow oil speeds might make for better in and out temp deltas but not enough heat moved overall. Thermal drop delta and overall volume per time unit is needed. BTU drop- per quart -per time unit. A restrictive cooler system might make good looking numbers but might not move enough heat to properly cool the system.

John, does plumbing the oil cooler from the bottom produce an air trap? Don’t know if motor oil is thick enough to just entrain and remove the air from inverted install. In the HVAC world this would be an issue. Bottom in / top out or in/ out from top is the standard used to prevent air traps.

disasterman

I mounted two stock units in sequence. Make sure your new/old stock unit is cleaned out. Temperature stays very cool.