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

[Craigers17]

That's interesting data. Nice Work! One test I'd like to see you try is removing your cooler duct and then replicating the same test run. I wonder if you remove the duct, place the 1st probe as close to the same proximity as it is in the duct, and keep every other variable the same.

....I think that not only would the data from probe 1 be interesting to see, but also how that might or might not affect the #2 probe? Just curious.

[GregAmy]

...try is removing your cooler duct and then replicating the same test run. I wonder if you remove the duct, place the 1st probe as close to the same proximity as it is in the duct, and keep every other variable the same...

"Brilliant minds", and all that. I was thinking the same thing as I was driving homeward yesterday. It would be easy to do, given the bottom part screws right off.

Idea was that pulling air from right next to the heat exchanger didn't do what I expected (pull cool air passing underneath) and maybe have made it worse (pulling ho air from off the heat exchanger).

Maybe later in the week. "Watch this space."