Rotax Oil Control Thermostats for Light Aircraft

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Every now and again something new comes along which stops you in your tracks because it is just such a good idea and a unique product.I have just come across one of these products and it's a specially designed thermostat system designed to regulate the oil temperature on engines like the Rotax.

We are all aware of the damage which can be caused by running your aircraft engine oil temperature too low, in fact Rotax has recommended to get the oil temperature just over 100°C during each flight to burn off the water which can contaminate the engine oil, if you are flying time and time again and the engine temperature is only getting to say 65°C the water will remain in your oil as a contaminant and can go on to destroy your engine with corrosion problems.

With an oil thermostat fitted warmup is achieved very quickly on even the coldest of days because the thermostat diverts the oil flow from the oil cooler directly to your engine saving you many minutes each cold start.

Made in the USA to aviation standards using aviation quality materials these special oil thermostat units are designed to quickly allow your engine to reach and maintain its optimum operating temperature even on the coldest of days.CNC machined from 6061-T6 the unit is anodised with the type 2 surface finish to protect the thermostat long-term against corrosion. All of the hardware is aircraft grade and the oil thermostat unit is finished to the highest possible standards, these units are approved by Rotax for the 9 series engines.

There are a number of benefits in using an oil thermostat in your aircraft which include fuel savings resulting from quick warmup times and reduced engine wear because your engine is operating at optimum oil temperature of around 90°C.

Stage 1

Cold oil: the internal oil bypass is open, allowing incoming oil to bypass the oil cooler and returned directly to the engine significantly reducing warmup time.

Stage 2

As the oil reaches the desired operating temperature the internal bypass partially closes, automatically regulating and controlling flow through both the internal bypass AND the external oil cooler so that desired operating temperature is maintained.

Stage 3

Hot oil: the internal bypass closes completely, directing 98% of the total oil flow through the oil cooler. Under these conditions, the all temperature is limited by the cooling capacity of the external oil cooler.


Will it reduce my oil pressure?    The simple answer is no installing an oil temperature thermostat may slightly increase your oil pressure when it is most needed during cold starts. It offers a shorter, less restrictive flow path to the lubricating oil while the engine is cold. The cold oil bypasses the oil cooler and eliminating the small pressure drop that would otherwise occur.

Can it block the flow of oil?   No, it cannot block the flow of oil in any circumstances whether operating normally or in a failed condition, it is impossible for the unit to block the flow of oil or the oil circuit.

What is the warranty period?   The warranty period of the oil thermostat is two years.

How big is the unit?  The unit is really small being 55mm high, 55mm long (without the hose barbs) and just 40mm deep, the unit can be bolted to the firewall or a bracket with the two 3/16" mounting holes.

Most important...  The Cost?  The cost of the oil thermostat is only $195 plus delivery.

More information through the Australian distributor X-Air Australia on +61 07 5568 7770

ThermoStasis 90°C Rotax Oil Control Thermostat
Screw It's - Deluxe 5 Pack With Vinyl Roll-Up Bag Price In AU$
ThermoStasis Rotax Oil Control Thermostat to suit the Rotax 912 series engine.

Get Quicker Oil Warmup, Increased Engine Life, more reliable operations

Delivery time within Australia approx 2 days by express post.

NOT supplied with hose nipples.

$195 inc GST

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