oil cooler cutout into and under tub

[Yan2947]

If you have added an oil cooler to a G model in the front valance (any type of valance/aftermarket), have you also cut into the body behind the cooler to give better flow, perhaps under the car and do you have any photos or is there a kit for such?

thanks!

Yan

[Bill Verburg]

Originally Posted by Yan2947

If you have added an oil cooler to a G model in the front valance (any type of valance/aftermarket), have you also cut into the body behind the cooler to give better flow, perhaps under the car and do you have any photos or is there a kit for such?

thanks!

Yan

It depends on the size of the cooler


I use a B&B cooler 5 1/2 X 2 1/4 X 20" w/ my 3.6/3.8, works great w/o athe RSR cutout

[Yan2947]

Any data on temp change with just the front oil cooler and the front oil cooler with the cutout?

[unclebilly]

Mine is spaced an inch or so away from the front of the body tub. It works as intended.

[unclebilly]

Originally Posted by Yan2947

Any data on temp change with just the front oil cooler and the front oil cooler with the cutout?

https://forums.pelicanparts.com/porsche-911-technical-forum/492336-budget-oil-cooling-myth-dispelled.html

No cutout.

[Uwon]

This is the setup on my RST….a 3.4 turbo into a backdated ‘78 still retaining the G-body slam panel for extra space behind the front cooler. Never an issue in heat or track.










Hope this helps.
Cheers,
Johan

[Bill Verburg]

Originally Posted by Yan2947

Any data on temp change with just the front oil cooler and the front oil cooler with the cutout?

w/ either my modded 3.6 or 3.8RS the oil temp stays under 180F no matter how hot. The caveat is no tracking for this car. My 993 w/ 3.8RS needs 2 really big front mounted coolers for track use.

note that there is no other cooler on my car

Uwon appears to have both a center mount and dual sandwiched fender mounts on his

[kent olsen]

A little different but the same idea. I've had a large oil cooler in the right front fender of my 72T for many years. I used to 'track' the car a lot, not anymore. Did very well on the oil temp until I'd get to a track without a long straight. Sooo what I did was move the battery to the smugglers box and cut out the battery box. Then riveted a panel over the hole. Then use some of that kind of spray fiberglass to direct the air thru that little grill opening and direct the air 'only' thru the cooler. Works fine.

[spuggy]

Unless you're planning a large, tuned motor, and running it hard enough to overwhelm the stock cooling - or a turbo, which make ridiculous amounts of heat - I'd SWAG "probably overkill".

PO added an RX7 (pretty sure) cooler and notched the tub for airflow. No fender cooler:





Turbos make so much heat it isn't funny.

With both CIS tunes I ran, oil temp behavior was identical; freeway cruise 180-185F unless ambient very high, temp spike after boost to 210-220F or so, reducing rapidly. Unless ambients were 100+F, then it'd cruise 210F, with post-boost spike proportionally higher (230F, maybe higher). Or in winter, when you'd have to get into boost to get temps (very briefly) over 175F.

With EFI and liberal use of thermal coatings, I now see "normal ambient" cruise around 175-180F and post-boost temp spike (with MAP ~0.4 bar higher) of 190F or so.

[Yan2947]

Hopefully I won’t get too beat up here. My 89 911 had some good rot in the sills and a crank shaft issue in 2010. I opted to put an LS1 motor in the car. Didn’t cut anything in the car. I put a large radiator in the tail with a large Spaal fan. The car has always kept coolant temp in check except on hot days in the upper 80’s in NY. My spaal fan cools very well in casual diving and in stop and go traffic. But, any hot day with some 3500+ rpm’s I get heat soaked and temps rise into the coolant temps of 230+ so I lower the rpm’s and the temp goes down. I added a fender mount oil cooler last year but haven’t had a chance to test it in super hot weather. I don’t think it will help that much. I added a temp sensor before and after the cooler and see an oil temp difference between 5 and 20 degrees usually. I am thinking off adding a small center mount radiator to run in parallel with the rear radiator. Even though it is small - roughly oil cooler size, being that I already have the one in the rear doing most of the work, could a small one in an RSR style valance take away the heat soak on higher rpm’s and would it be best to add the ducting to have the air through the cooler diverted under the car? I don’t want to put a full Renegade Hybrid radiator setup in this car. I want to keep the stock front trunk. I would rather not have to remove the AC condenser up front but that is an option. Thanks for the insight.