Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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 Posted: Sat Mar 14, 2020 7:00 am Post subject: MOgas vs 94UL vs 100LL |
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While most our Lycoming engines were certified on 91/96 octane with stock 8.5 to 1 compression ratios,
I have been reluctant to use mogas unless I knew I was going to burn it all within 24 hours. I think the current versions of Proseal are resistant to mogas, I know some earlier versions were not. Then there is always the concern of unadvertised ethanol making its way into the fuel, as well as mogas aging rapidly.
94UL would be great, but the cost and availability just don't make it worthwhile unless it was a local supply that you could use all the time, to avoid lead compounds in the oil. Even if you engine is certified, as mine is, I can't think anyone would care whether you had an STC or not.
| Quote: | | Sent from my TRS-80 Model 100 |
On Sat, Mar 14, 2020 at 7:09 AM Bill Boyd <sportav8r(at)gmail.com (sportav8r(at)gmail.com)> wrote:
| Quote: | Don't have an STC because my RV-10 won't have a TC 
On Fri, Mar 13, 2020 at 5:42 PM William Greenley <wgreenley(at)gmail.com (wgreenley(at)gmail.com)> wrote:
| Quote: | Just checked, at the closest air to me to buy Swift UL94, it is more than 100LL. Michigan City
On Fri, Mar 13, 2020 at 5:33 PM Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
| Quote: | No STC needed for amateur built aircraft, unless you are keeping the engine in certified mode for some reason.
Biggest issues with Swift Fuels 94UL is that it is only available a few places in the mid-west and it costs as much as 100LL.
| Quote: | | Sent from my TRS-80 Model 100 |
On Fri, Mar 13, 2020 at 10:41 AM Alan Mekler MD <amekler(at)metrocast.net (amekler(at)metrocast.net)> wrote:
| Quote: | Do you have the swift fuel stc?
Sent from my iPhone
| Quote: | On Mar 13, 2020, at 1:28 PM, Bill Boyd <sportav8r(at)gmail.com (sportav8r(at)gmail.com)> wrote:
Makes one glad to be using mogas in the ol' Lycosaurus.
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD |
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