IO 360 on Mogas

[qmdv]

Talked to a guy that has a Maule with a Continental IO 360 in it. He was wondering about running 91 octane eth free auto fuel. He said that there is an stc for the plane but not that engine. We all know that there are two reasons why some engines do not have stc for mogas. First, not enough market to pay for testing and Second it was tested and failed.

The IO 360 is 8.5 to 1 compression. The Lycoming O 360 A1A is also 8.5 to 1 and it has a Peterson stc for mogas (91 octane). Then how about a Continental IO 470 with 8.6 to 1 comp ratio in a C 180.

Your thoughts. I know the legality but what if these engines were in an experimental.

Tim

[M6RV6]

The main reason there is no STC for mogas on an injected engine is vapor lock as I understand it?
Has to do with the fuel system and spider!
That's what I have been told, also that if under 5000' it was not a problem, have run mogas in a io520 one time on an emergency, but was at sea level and did not use all the HP.

My $.02
GT

[OregonMaule]

There is more to the auto gas STC than a piece of paper and a sticker. My O 540 has the Peterson STC. 2 electric fuel pumps besides the engine driven one. Engine driven pump has a scoop and scat tube directed in the pump. Scoop to the gascolator. One electric pump runs all the time the engine is on. The 2nd pump is turned on by a switch during TO and landing. A very detailed operation manual for most scenarios you may encounter.

You can burn what you want and be a test pilot I guess

[Resky]

As gmdv said, the IO-470 in a Debonair has a STC for mogas - thats the 225 hp one. Thats the only injected one I know of, but I don't know much about the Peterson STCs.

[dirtstrip]

Your thoughts. I know the legality but what if these engines were in an experimental.

Tim

That just becomes part of your experiment.

[hotrod150]

... My O 540 has the Peterson STC. 2 electric fuel pumps besides the engine driven one. Engine driven pump has a scoop and scat tube directed in the pump. Scoop to the gascolator. One electric pump runs all the time the engine is on. The 2nd pump is turned on by a switch during TO and landing. A very detailed operation manual for most scenarios you may encounter. ............

The Petersen website sez the mogas stc for the lycoming powered maules are available from Ray Maule. Does petersen own the stc & ray maule sells/controls it? Apparently the mogas stc for at least some of the cherokee models is similar to the maule stc-- extra fuel pumps, etc.
What did that stc cost, with the extra pumps etc, and what was the installation time? Normally a mogas stc costs $1.50/horsepower & installation costs are minimal-- paperwork, placards for the engine & airframe, & checking to make sure a plastic carb float is not installed.
Yes Petersen has an stc for the IO-470 Cont, it even looks like it is for 87 octane, but it looks like that's the only injected engine-- no IO-360 Lyc, no IO-360 Cont, no IO-540 Lyc, no IO-520or 550 Cont. No 220 Franklin either.
BTW EAA only holds 87 octane (low compression) mogas stc's, EAA has both low-comp (87 octane) & hi-comp (91 octane) stc's.
A guy named Blue Leader from the 170 site (may have been on here also?) used to swear by mogas for his IO-360 powered C170, claimed he never had a problem. I think he wrecked it but don't believe that had much to do with the fuel.

[iceman]

sure would be nice to go to mo gas....