Anybody have any experience with this? I'd guess that it needs to be minimum 91 octane. Seems like it wouldn't be a problem, with the appropriate STC. Is one available for this airframe/engine combo? Hoping there's a 22/20-180 owner or two among us who can enlighten me....

Eric

Peterson and EAA are the ones with the STC's. You are going to have a hard time finding 91 octane auto fuel that doesn't have alcohol in it, I'd bet. Not possible around here, but this is farm country. FAA says NO alcohol in car gas in airplanes, unless they've lifted that ban recently.

MTV

I think 91 is available around here without alcohol. I burn 87 cargas in my 170 as well as both my cars,I know that's available in the "pure" state. I'll have to investigate the premium grades. But I'm out in the sticks here, I can't vouch for Seattle.

Eric

You can use this map to find out if ethanol is being added: www.npradc.org/issues/fuels/state_bb/us_fuels_map.pdf I would test the fuel anyway. You can also call your state office that tests gasoline and ask if any ethanol is being added in your area. Check this site to determine if your plane qualifies for a mogas STC: http://www.webworksltd.com/autofuelstc/ ... ation.html - Mike

I do not believe the O-360 has an STC for auto gas. Only the low compression engines are available to use the Mo-gas STC.

Approved O-360 models, Petersen STC, asterik means 91 octane min. (from Petersen website)

0-360-B1A, -B1B, -B2A, -B2B, -D1A, -D2A,-D2B, -A1A*, -A1AD*, -A1D*,-A1F*,-A1F6*, -A1F6D*, A1H6*, -A1G*,-A1G6*, -A1G6D*, -A1H*, -A1H6*, -A1LD*, -A1P*, -A2A*, -A2D*, -A2E*, -A2F*, -A2G*, -A2H*,-A3A*, -A3AD*, -A3D*,-A4A*, -A4AD*, -A4D*, A4G*, -A4J*, -A4K*, -A4M*, -A4N*, -A5AD*, -C1A*, -C1C*, -C1E*, -C1F*, -C1G*, -C2A*, -C2C*, -C2E*, -C4F*, -C4P*, -F1A6*, -G1A6*, -J2A*, H0-360-C1A*

I sure hope the O-360-C1F has a STC for mogas or I have a counterfeit STC. <g> - Mike

Also have to have the STC for the airfraim. I used to fly a Beachcraft Muskateer. None of them had the STC for auto gas. The reason they did not have the stc for that plane was that there were not enough of the planes made to make it worth the efort. Rumor has it that it worked fine on 91 auto gas.

Tim

MTV,

Most of the 91 octane in your area "should" have the pump marked wether or not it contains ethanol. I know there are no stations around that have 87 without it. So I have to use the 91. It seems there was some type of stipulation that the 91 was suppose to be ethanol free so it could safely be used in small engines. The local Cenex is the one I trust the most.

Keith

We did a 180 PenYann conversion to our Skyhawk and lost the option for the autogas STC. I wasn't aware there were any Lyc O-360's that were listed for the fuel but inasmuch as there is on for some of the older O-470's I should have realized otherwise.
Alcohol in the gas is not supported in any of the STC's because some of the fuel system components will deteriorate under the presence of alcohol. We had a J-3 cub where the owner just decided to run cheap mogas and the seals started to fall apart. The results were an unscheduled engine stoppage.

Talked to Texas Skyways about the aviation E85 stc for the 182 and the only thing that they do to the airframe is make sure that the later bladders are in place. They also make sure that there is plastic carb float.

If 85% ethanol is ok, then how would the amount of it in California auto gas be a problem. I am sure that the aviation ethanol is much better than the ethanol used in your Toyota.

Is this kind of like some drugs that are for human consumption in one bottle and for cattle in another bottle. They come from the same vat. I remember when on the swim team in high school in the early 60's, our coach told us we needed wheat germ in our diets. Most went to the health food store but me and my buddies went to the pet store and got the Rex's wheat germ oil for the dog. The label said for silky smooth coat. then in college when we got a cold we would get the tetracycline that you were supposed to add to the fish tank.

Tim (with a silky smooth coat yet today)

I finally decided to go right to the source, and emailed Petersen Aviation about an autofuel STC for the PA-22/20-180.
Todd Petersen's response: "I'm sorry, but no that particular combination is not approved. It would need seperate flight testing since it uses the fuel pumps. I have an STC for the PA-22/160 but that's as far as it goes with this series of airplane."
Guess that settles that!

Eric