Van

Thinking about putting a 2nd stock 951 oil cooler on my 951 (on the other side of the radiator).

Should I run them in series or parallel?

I believe the 996 has the radiators in parallel - I'm thinking I'll take my cue from that.

Tom W

Mine are in series.

Geoffrey

series works fine.

Willard Bridgham 3

Series if you're looking for high temperature drop, parallel if you're going to increase the oil volume.

Since the engine and pump are the same size, you're looking for high temp drop....coolers in series.

RedlineMan

Hey;

Parallel makes for a lot more clutter in most cases, and is not generally what
you are looking for. If you only need cooling, keep it simple. I would also look
to use a more efficient cooler than the factory one. Lastly, when placing any
cooler in-system with any other exisiting compontents, make sure that you are
not adding any restriction to the system, which would obviously defeat the
purpose and potentialy cause peril. -12 minimum for any lines.

Van

Well, I have a spare factory one (and hoses) kicking about... So that route is the lowest cost. I'm also not ready to remove the fog lights yet.

Giacomo

Mine was installed in series.

Skip Wolfe

Series for me as well.

DanR

I put a KISS one in series

Brinkley

Novice Question Alert

Can you guys define the difference between "in-series" vs. "parallel"?

My guess is that the option of in-series would have the oil pump send oil to the first cooler then on to the second cooler then back to the motor. Is that correct and if so would the second cooler increase resistance that the original pump may not be able to handle? Or am I all wrong on that thought?

In parallel, sounds as if there are two oil pumps pushing oil into two separate complete and independent loops that include the coolers?

Just looking to learn about this topic.
Thanks for the insight.

RedlineMan

Well...

You'd have a real trick getting a 2nd oil pump in, eh? In series adds to the exisiting out/back loop. Parallel sends out a 2nd seperate loop from the source.

Van - At the least you'll likely end up doing some custom hoses/fittings for the second cooler as I doubt any of it will fit/reach. My opinion is that adding a second OE cooler would not be an efficient and worthwhile improvement, or at least not enough to warrant the effort. Cheap is good but not if it is marginal, in my book.

smlporsche

Thanks Brinkley for asking the same question I was wondering...

John, would there be any improvement from replacing the existing factory unit with an updated and/or slightly larger unit? If so which one would you reccomend?

Thanks

Van

For parallel, I was going to have the output (from a single pump) go to a "tee" then to both coolers. After the coolers, it would come to another tee and then back to the engine.

John, you're right that the hoses would need some modification - but at least I have all of the fittings (and assume a hydraulic shop could fab up hoses to whatever length I need.

Willard Bridgham 3

The oil pump in a 944T is a gear pump and they are quite insensitive to pressure changes at constant flow. The only thing that changes flow in a gear pump is rpm.

The pressure drop from either aftermarket coolers or stock coolers, including the piping, is quite small.

A.Wayne

Parallel !

or

betta ! get rid of the factory and buy a bigger more efficient cooler , stock is a toy . .......