Auto fuel STC

from what I understand, if the engine isn't fuel injected then the STC should be available but you'd have to read through the STC documents to confirm that.
 
Mine had an auto gas stc added in 2008. Only limitation is ethanol free gas. I’ve used it a lot with no problems. O-320. I also had an stc in a C-172 same basic engine.
 
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When these engines were designed gasoline quality was not nearly as good as it is today. Auto engines seem to handle this modern gasoline just fine - my 1965 Mustangs seem to sit more than they run, and still run fine.
I think the small Continental and Lycoming engines are 1930 tractor technology.
 
Bob Turner said:
When these engines were designed gasoline quality was not nearly as good as it is today. Auto engines seem to handle this modern gasoline just fine - my 1965 Mustangs seem to sit more than they run, and still run fine.
I think the small Continental and Lycoming engines are 1930 tractor technology.
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I think it's mostly a paper issue related to how much HP the engines make with lower octanes, and the impact of that on published operating limitations. Not a major factor for our planes, but I have read it is a very difficult problem for some higher performance aircraft.
 
My 7GCBC has an O-320 (carbureted). It's an 80-octane engine. I got the mogas STC and operated it on 87 mogas for several years until alcohol-free mogas became impossible to find in Arizona. The only difference noted was that spark plugs, valves, and piston tops stayed perfectly clean from one annual inspection to the next. I'd switch back to mogas in a moment if it was available here.
 
Desert7GCBC said:
My 7GCBC has an O-320 (carbureted). It's an 80-octane engine. I got the mogas STC and operated it on 87 mogas for several years until alcohol-free mogas became impossible to find in Arizona. The only difference noted was that spark plugs, valves, and piston tops stayed perfectly clean from one annual inspection to the next. I'd switch back to mogas in a moment if it was available here.
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They don't sell it for boats? It is everywhere in Florida. Though I suppose we do have a lot more water.
 
I have a nice 100gal tank/pump/filter/extinguisher setup mounted on a small trailer. Unfortunately, the nearest marina is 150mi north. Running mogas would save $20/hr.
 
Owing to the different posters in this thread the OP's question about his IO-320 being ok for mogas might have gotten lost.
To be clear, car gas cannot legally be run in an injected motor. Most if not all carbed planes are ok for non ethanol car gas.
 
Thanks. Did not know that.
Do you suppose that is because nobody has sought approval, or because auto would mess up our primitive injection systems? Seems to work fine in auto injection systems.
 
Bob, I believe it's because auto fuel vaporizes much easier than 100 LL. Bring it up to pressure in a fuel injector servo and, depending on the barometric pressure and subsequent pressure drop car gas turns to a gas...causing a vapor lock in the fuel system.
Carburetors let the fuel go thru one orfice and into the motor.
Chris
 
Hiperbiper said:
Owing to the different posters in this thread the OP's question about his IO-320 being ok for mogas might have gotten lost.
To be clear, car gas cannot legally be run in an injected motor. Most if not all carbed planes are ok for non ethanol car gas.
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Outlier - O-235-K2C isn’t ok for Mogas per the Peterson stc. Probably as it requires 100LL whereas the majority of carbed engines do not.

Would be nice if it was! Would love to use mogas.
 
Vtailman said:
Outlier - O-235-K2C isn’t ok for Mogas per the Peterson stc. Probably as it requires 100LL whereas the majority of carbed engines do not.

Would be nice if it was! Would love to use mogas.
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Yea, the baby lycomings I had in my AA1's were all the -C2C and L2C which ran on auto fuel just fine but they were all low compression models.
Sure made 'em cheap to run.

Chris
 
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