Thermostasis Unit Manufacturer Query

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The units are inherently simple devices and nearly impossible to mis-install.
Reversing the Feed and Return ports only introduces a slight temperature offset.

What are the Questions?

Hi Bill

Thanks for the reply. They are indeed fantastic because they are simple and light and mostly idiot proof for folks fitting them into their aircraft. That's why I like them!

I just want to know if they are still being made or if the Aircraft Spruces and Specialties are selling existing stocks of them that when they are gone they are gone. We have a few kit builds on the horizon and it would be nice to know that the units will continue to be available for a while. 

It is also nice having a current manufacturer to provide provenance for parts and a track record of testing in the field. It adds to the strength and confidence in an aircraft modification when the weight of paperwork that supports such mods can be more than the weight of the aircraft! 

It is just a peace of mind if we pass an aircraft that we have built on to another owner if the manufacturer of a piece of equipment still exists. 

Hi Bill,

I too have a question to you or anybody else listening:

I have no prior experience with this thermostat, but just bought an E-LSA with a thermostasis unit and on the ferry flight I had the impression it does not really work. When it was hot the oilcooler did its best to keep temperatures at 210F, but couple of days later at ambient temps of around 70F the oil temps where down in the 160-170F range.

Looking at the install manual from AC Spruce seems like one can change left and right (so the side on which the oil cooler is installed) but not "up" and "down"? On the installation on my airplane the oil in from the tank and out to the oil pump are the mirrored to the picture on the install sheet.

Is this an issue, do have to turn the thermostat around?

Joe W.

Keep in mind what it is and what it isn't.
It is Not an oil temperature regulator.
It is only meant to get initially get your oil up to an acceptable temperature and then hand off the cooling job to the oil cooler.
At temperatures below the set point, the thermostasis unit bypasses most/some of the oil around the Oil Cooler, causing the Oil to Not be cooled and allowing the engine to heat up faster.
Above the setpoint, the Thermostasis unit stops bypassing and acts as if it did not exist, allowing all the Oil to flow through the Oil cooler and the Oil temperature will rise to the heat capacity of your Oil cooler.
The Oil flow is either Through the Cooler Only or through the Cooler AND the Bypass.
It is NOT through the Cooler OR the Bypass.

If the engine does not make enough heat and your Cooler is very efficient, the temperature may not make it up to the set point on cooler days.
If the thermostat unit is installed on the return side of the Oil Flow you will see a slightly higher Oil Temp than if it were installed on the Supply Side.
Assuming a 185°F set point.
Do you want the Bypass to close when the Oil Coming from the Engine reaches 185?.  Supply-Side sensing. Cooler Oil Return.
Or, do you want the Bypass to close when the Oil coming from the Oil Cooler reaches 185?  Return-Side sensing. Warmer Oil Return.