View Full Version : AvGas
03-18-2011, 03:08 AM
Anyone know of any issues with using a little AvGas in a Sub 2.2?.
(I mean blended with Premium Auto Gas in a pinch)
Barry (I've got gas) K
03-18-2011, 04:22 AM
I ran about 6 hours worth of the stuff at bensen days and it left so many deposits in the oil pan I was shocked. LL100 is a very very dirty fuel. If you run it on your carbed engine, I would use the additive to keep the lead from building up .
03-18-2011, 09:36 AM
I saw significant deposits on my O2 sensor after just half a tank of 100LL added to half a tank of 87 Unleaded auto gas. I tried later with straight 100LL using the lead remover from Aircraft Spruce and didn't get the deposits. I didn't run it long like that (about 30 minutes) because I don't know what else might be going on (burning valves, etc).
03-18-2011, 05:27 PM
03-18-2011, 05:48 PM
I have an issue using it in a Lycoming. I paid $7.46 a gallon last night at SDF Louisville, KY.
03-18-2011, 06:23 PM
I run nothing but 92 octane non-ethenol gas... Can't go wrong with it in any non-aviation gas engine... and under $4 a gallon.. (my opinion)...
03-18-2011, 06:40 PM
I use premium mogas in my 2.2 Sooby and 100LL in my VDub Sonerai. I tried morass in my VDub 2180 and there was a noticeable difference in performance so avgas only for it. I have mixed a little avgas in my Sooby without any problem.
03-18-2011, 07:00 PM
You can pretty much throw any O2 sensor in the trash after you use any leaded fuel in it. The lead will coat and smother the sensor rendering it useless. If you use the additive you may be able to get away with it.
03-19-2011, 01:48 AM
Thom, why do you use premium in the Subaru ? Is the compression that high to require it ?
If not do you think that it improves power ?
What is morass ????
Shawn, what do you feel is better about the premium ?
I can only get 87 octane without ethanol right now & after reading up about octane, I am wondering why I have ever used premium hi test ?????
So.......what is the benefits of high octane ???
03-19-2011, 01:55 AM
watch this .....YouTube - Octane Booster Explained (http://www.youtube.com/watch?v=t5Gx6vg7qgQ)
a quote..........It depends on what the manufacturer calls for. I am not sure on the compression ratios in those cars. If it calls for 87 then you probably would not see any benefit in running a higher octane. Read the owners manual it should say in there. end quote.
I bought a bottle of this intending to blend it in with my 87 .........
When I read the bottle it says " for 4 stroke engines only ! " I guess I will get my 10 bucks back !
03-19-2011, 10:49 AM
There are some really interesting things happening right now with compression ratios. Mazda will reportedly introduce a gasoline auto engine which runs 13:1 compression (14:1 in the Japanese market) by using direct injection to precisely time the fuel charge to avoid detonation. It will reportedly run 87 octane fuel.
There will be some issues extending this technology to aircraft, where redundant electronic controls will be required for LSA or Part 23/27, but I'd bet there will be experimentals using it within two years.
03-19-2011, 11:24 AM
Thom, why do you use premium in the Subaru ? Is the compression that high to require it ? My Sooby is carbed not fuel injection. RAF says to use only Premium. I do use a little Avgas when I'm out and have to get fuel that doesn't have premium mogas.
If not do you think that it improves power ?My 2.2 has plenty of power and I really don't want convert it to fuel injection right now.
What is morass ???? Mogas it was a typo but might be appropriate also.
Thats about does it. I found that Avgas keeps my engine cooler that mogas and I get about 300 rpm more at WOT.
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