Under Trunk Temp., Addition to Oil Cooler Thread. Options

[Olympic 914]

So on the Oil Cooler thread the suggestion was made to place a thermometer under the trunk to check the temps to determine possible difference for cooling efficiency.

I don't know if anyone had done this before. So I broke this off into a new thread for future reference.

One of the Oil Cooler threads

http://www.914world.com/bbs2/index.php?showtopic=347075

So yesterday I did this.

Using a Wifi endoscope taped to a magnetic tool holder with a thermometer.

Placed parallel to the Setrab oil cooler to sample the air temp without the fan blowing directly on the thermometer










And went for a drive. My GF rode along to monitor the temps and take notes.

The outside temp was 80 rising to 85 yesterday.

Idling in the driveway the temp rose to 125, after 2 miles of two lane roads 30mph it had dropped to 120.

at 4 miles stop and go it was still 120, Oil temp 200 CHT 340

onto a two lane road for 11 miles with speeds from 30-50 mph air temp was between 118 + 120 deg Oil temp 212 CHT 322

at this point I stopped for 2 minutes to mimic sitting at a long light or in traffic.
the air temp rose to 140 deg Oil temp 210 and CHT 337

Pulled onto 4 lane and accelerated up to 70 mph. After 1/2 mile the air temp had dropped to 125deg oil temp 209 and CHT at 370.

mostly level with some slight grades.

Turned around at 23 miles

Air temp holding at 125 deg Oil temp 213 CHT 330

The battery was low on the endoscope and I had turned it off on the way back, and when I turned it back on I discovered that the duct tape had loosened and I lost my thermometer.

My setup is a 2056 9590 cam Djet. , Oil cooler is Setrab 119 fanpack 180 deg oil thermostat and 190 deg sensor for the fan. Exhaust is SS HEs and a Triad muffler.

When running in normal summer heat the fan runs constantly.

If any one else decides to do this Please add your results here.

Tom

[GregAmy]

Ok, this morning wasn't unbearable heat, so here's my novella...

Test process:

- Equipment as in the above post. Probes were placed in four locations:

#1 (green dot in screen shots), intake of my oil cooler duct I built, with the intent of pulling cool air across the cooler.
#2 (blue dot in screen shots), top of cooler fan, air exiting the cooler
#3 (red dot in screen shots), probe stuck backwards from the engine compartment through a wiring grommet in the vertical sheet metal. So it's measuring the air temperature pretty much at the transaxle/engine interface.
#4 (orange dot in screen shots), probe tye-wrapped to the right side fuel line in the engine compartment.

The car: 1974 2L, dead stock long block (AFAIK) but powered by Microsquirt. The oil cooler has been replaced by a Tangering Racing kit which includes a thermostatic block that bolts up where the stock oil cooler was.

The cooler includes a Microsquirt-controlled fan, which comes on at ~220 and shuts off at ~200. Oil tmeperature is measured at the cooler exit line.

Ambient conditions: sunny, 79F. Started roughly 830AM so low sun.