G100UL

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rominoff
Posts: 39
Joined: Sun Dec 06, 2020 7:36 am
Location: Bothell, WA
Name: Bradley Bell
Aircraft Type: '47 C140; '48 NAVI
Occupation-Interests: Software & Systems Development; A&P/IA
Contact:

G100UL

Post by rominoff »

Looking at the G100UL STC, seems like our planes will cost $175. Anyone bought the STC?

https://www.g100ul.com/
6183
Posts: 303
Joined: Tue May 01, 2018 7:00 am
Location: Florida
Name: Mike Smith
Aircraft Type: 140A (2) 1949 & 1950
Occupation-Interests: Retired aerial power line patrol pilot for Gulf Power Co
120-140 Assoc. Florida Rep. N9633A & N9688A
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Re: G100UL

Post by 6183 »

What's the availability and cost of G100UL fuel compared to 100LL? I for one haven't seen any FBO's or airports in NW Florida advertising it.
8342
Posts: 293
Joined: Sun Oct 14, 2018 11:55 pm
Location: KUSE Wauseon OH
Name: Rick F
Aircraft Type: C-140 (sold)
Occupation-Interests: Captain B-777 (Retired)
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Re: G100UL

Post by 8342 »

We have Swift fuel UL94 here at KUSE, Fulton county OH.
They charge $1 a gallon more for it but I don't care.
That is all that I have used on my C-140 and the plugs are perfectly clean.
Runs great.
I am very happy.

Rick
rominoff
Posts: 39
Joined: Sun Dec 06, 2020 7:36 am
Location: Bothell, WA
Name: Bradley Bell
Aircraft Type: '47 C140; '48 NAVI
Occupation-Interests: Software & Systems Development; A&P/IA
Contact:

Re: G100UL

Post by rominoff »

I read, when available, it will be about 80 cents more per gallon... but the upside is a cleaner engine (combustion), and i can stop using TCP in my fuel to scavage the lead out.
rominoff
Posts: 39
Joined: Sun Dec 06, 2020 7:36 am
Location: Bothell, WA
Name: Bradley Bell
Aircraft Type: '47 C140; '48 NAVI
Occupation-Interests: Software & Systems Development; A&P/IA
Contact:

Re: G100UL

Post by rominoff »

i am of the opinion that we do not need to buy the STC since our TCDS states explicitly 73 min. octane aviation gasoline for my little stock engine - re: G100UL is 100 octane which exceeds the requirement. I do not plan on purchasing the STC for either of my airplanes.
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bill_e
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Joined: Wed Aug 31, 2022 8:07 am
Location: Detroit Lakes, MN
Name: Bill
Aircraft Type: 140
Occupation-Interests: Aircraft powerplant systems engineer
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Re: G100UL

Post by bill_e »

rominoff wrote: Sat Jan 14, 2023 5:16 pm i am of the opinion that we do not need to buy the STC since our TCDS states explicitly 73 min. octane aviation gasoline for my little stock engine - re: G100UL is 100 octane which exceeds the requirement. I do not plan on purchasing the STC for either of my airplanes.
Not that I'm an authority on it, but that's my interpretation of our fuel limitations as well. The C85-12 TCDS (E-233) also specifies minimum grade 73 octane aviation gasoline. I haven't looked to see what some of the STC'd engine replacements might have for limitations there, but it's probably worth checking to make sure Lycoming didn't specify something more stringent if someone has an O-235 or O-290 installed.
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