Edit: Results for trombone, Mocal, Mocal with dual fans + water are on page 4, post #67.
Test bed is '80 911 with '85 3.2 . Oil cooling system is currently entirely stock. On hot days in stop & go traffic (Miami), oil temps can get out of hand. For the sake of engine preservation and when traffic seems to promise cooked oil... I'll detour, accept delays, and on occasions be late to events in order to avoid oil-BBQ. Why I've waited so long to attend ithis... no use to ask. Have now bought into a Mocal in order to end oil temp frustrations. After receiving Mocal... very nice looking unit but... it's small---volume of oil it holds is not as impressive as envisioned. On this lacking basis as I see it, am now questioning if trombono (with it's greater oil volume) might thermally outperform the Mocal in hand. Trick to this is possibly stupid-simple---clean trombo down to bare metal and install bumper air scoop. Rather than guesstimate, will get numbers to know.
With two uber sensitive digital temp sensors in hand, number collection is near---possibly today provided life not getting in way. Rain may also delay things. Sensors read from -30 to +800 dC so no problem with whatever temps are had (supposedly.) Both sensors have been compared against a mercurial thermometer for relative accuracy. While digitals read about 2.5 dC higher than thermometer, the digitals do temp-match each other. Plan is: put sensors on oil plumbing just behind fittings leading to trombo. This allows Mocal to be swapped in for trombo while sensors remain untouched. To complicate things just a bit, am inclined to get more than a simple perspective into what's going on in regard to in-fender oil cooling. This means looking at pipe temps under a few different hardware set ups. More, am going to test each set up at two different operating speeds.
Test scenarios:
- Dirty trombone
- Clean trombone *
- Clean trombone with bumper air scoop**
Mocal now takes place of trombo...
- Mocal with bumper air scoop closed ***
- Mocal with bumper air scoop open
- Mocal with bumper air scoop's air directed towards Mocal ****
* This trombone has never been cleaned to my knowledge. Will bring it to bare metal by wire wheeling it.
** Air scoop installs in place of right front running lamp. Is a new install.
*** Scoop's inlet is taped shut.
**** Deflector is positioned in wheel well to improve air flow from scoop's outlet towards Mocal. Seems a good idea but whether I do this or not is questionable. The horns may interfere with this being a simple mod... Could take hours to sort out. Will see.
For convenience, I've long-wired the sensors to their respective digital displays---displays will be located in-cabin. Wiring will be blue-taped to outside of car. I'll take display pics on the fly at 35 mph, then at 70. To allow oil temps to stabilize before taking readings, plan is to drive each speed for 12 minutes or so beforehand... Longer if pipe temps are still climbing, or still dropping.
Car's oil & filter have close to 600 miles. 20-50wt is installed. New oil temp sending unit was just installed. Oil temperature overlay was just placed on gauge. Bumper air scoop was just installed. Tank level at operating temp is midway between low and full hash marks on dip stick. Was thinking to include Spal/fan in this test but decided to see where temps were before getting into a Spal.
Will post pics after testing's done.
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