The new Airwolf Oil Chiller is 20 aircraft quality aluminum fins that are precisely bent to mold around the outside of any standard oil filter.
These fins total a whopping 300 sq/in of cooling area to suck the heat from your oil filter, thereby cooling your engine oil. The fins are gold anodized and quickly secured to the oil filter with two hose clamps. Easy on..easy off. Everything you need is in the kit. Lower your oil temperatures today with our “Poor Mans” oil cooler.
I belong to a local soaring society. One day I happened to be
talking to a couple of the tow pilots. Given my curious nature, I asked them
what the oil temps were on the Scout. They said on a 5000’ tow, the temps were
right at 250F. I said, “Say what?” There said you heard us correct. Oil Temps
are 250F. I said “are you guys crazy, you can’t let temps get that hot, you are
going to cook the engine. I said guys, I will pass on a saying an old timer at
Lycoming once told me which is at 265F you have two minutes to live. The oil
temp you read on your instrument panel is actually 50 F lower than what the oil
is in the sump. Therefore 265 plus 50 = 315. At 315F there is no lubricity left
in the oil and engine failure will occur. I told them the first thing they need
to do was calibrate the engine temp sensor to see what the engine was really
operating at. They calibrated it and found it to be accurate, and the engine was
truly running 250F.
What bothered me the most is these guys thought nothing of running the temps this hot because the were “still in the green”. Granted common sense says you want to be in the bottom of the green, not at the top of the green which sits right next to red line on the gage. And given one of the tow pilots is a 737 driver, I was baffled there was such a lack of concern about high oil temps, [Yeah, I will probably catch hell when he reads this, but it is, what it is.]
There is an internal joke within the soaring society that tow plane pilots are out to kill glider pilots. As much as I hate to say it, there maybe something truth to this thought process as again I am baffled on why there was such a lack of concern about critically high oil temps.
I contacted all the members of the soaring club that if I they wanted to keep me as a member, we had to address these high oil temps. I told them there were going to have to spend some dollars with` Airwolf, but that I thought we could really help them. To my relief they agreed with my logic below.
The following is the plan of attack I developed for the club.
Remove the engine mounted oil filter which placed a short CH48108 filter upside down on the back of the engine. It makes a heck of a mess to change anyway, so a good reason to get rid of it.
Install an Airwolf remote mounted oil filter and place the filter at the very bottom of the firewall, where all the air that exits the cowl will pass over it giving us maximum airflow to pull heat out of the filter can.’
Use the tall Champion CH48109 filter to give us more oil in the system, and more surface area to dissipate heat.
Make some aluminum fins to clamp around the outside of the filter to increase surface area and maximize heat dissipation. I drew them a sketch. However, one of the members is an engineer, and he took my design and improved upon it. I really liked the changes and asked if he cared Airwolf offered it to the world, assuming of course that my ideas worked.
With the above 4 changes in place, the oil temps on the Scout
dropped from 250F to 200F. They experienced a true 50F drop in oil temps. I
never imagined our oil chiller would ever drop the temps this much. I would have
been happy with 10 degrees. Also, when they changed from towing the heavier
gliders at 65 kts to 75kts, which dropped the temps another 15 degrees with the
end result being 185F, which is exactly the temperature Lycoming wants their
engines to operate at. Life is good.
The above is what we know works, and more specifically, how well it works. Our oil chiller is a great heat sink, just like you would see on a computer CPU. It maximizes surface area for cooling, but it depends on air flow. The greater the airflow...the greater the results. For people wanting to put our chiller onto an oil filter which is bolted directly to the engine, you have to remember you have a massive heat generator called and aircraft engine, which is radiating lots of heat. The further you can get our filter from this heat source, the better your results will be. Here is how I suggest you try it out on your aircraft.
Assuming you do not have one of our Airwolf Remote Mount oil filter kits installed on your airplane, install our oil chiller onto your engine mounted oil filter and measure the results.
Take a blast tube and direct some air from the upper deck on your cylinders onto the oil chiller and see how much more this helps.
If neither of the above two options gets you the reduction in cooler you are looking for, install an Airwolf remote mounted oil filter kit and located the filter at the bottom of the firewall as described above on the Scout.
For the really smart people out there who already have our filter kit installed, you have 98% of the work done. Just clamp the oil chiller around your filter and away you go.
Bottom line is our oil chiller really works. If it can drop
temps 50F on a 180 hp American Champion Scout towing a heavy glider with three
passengers up to 5,000’, imagine what it could do for you.
There are no guaranties in life, and we do not guarantee how much it will drop your temps. We made our chiller so reasonable in price, that you have so little to risk, and so much to gain. We want to hear all feedback, as to how well it works on your aircraft.
FYI The above was written at Oshkosh 2011. We never expected the kind of response from this invention and we are talking non-stop to people. I did my best to spell check this and make it readable. I will refine it when I get back in the office. So for all you English majors out there, give me a break and don’t critique the grammar.
Senior Tech Rep
Airwolf Filter Corp