Swift Fuels UL94 Av Gas

[427yenko]

I have been hearing about a relatively new product on the market being sold at airports called UL94. Produced by Swift Fuels, their website states it has a motor octane of 94+ and is "also rated as a super-premium ethanol-free auto-gasoline with a 99 octane (R+M)/2 rating that meets and exceeds the ASTM D4814 autofuel specification."
Does anyone have any experience in using this fuel in their muscle cars requiring higher octane than what is available at most pumps?
It appears as though this fuel would have a research octane of around 104 +/-, which would be perfect for higher compression engines of the late 60's, assuming your heads can handle fuel that does not have lead additives. It certainly seems to be a much cheaper option than 110 leaded at about $10/gallon around here, even when mixed with pump non-oxy. My local airport has it for $5.79/gallon right now.
Any thoughts?

Bob

[sixt9rsx33]

Hmm, have never heard of it. I use 100 octane LL AvGas from my airport at around $6 per gallon in my cars, but word of caution. I put this fuel in my survivor 70 W30, ran great initially. However, after a quarter tank of using this fuel must have "cleaned" my fuel system really well and dislodged a lot of crap which made its way into the carb. Took the carb off and it was a mess with so much junk in it. After a quick rebuild runs great now.
I have had great luck mixing 93 pump gas with Klotz octane booster https://www.amazon.com/Klotz-Higher-Octane-Booster-Gallon/dp/B008YEHRUK/ref=pd_bxgy_thbs_d_sccl_1/142-3771532-8756013?pd_rd_w=JYJwb&content-id=amzn1.sym.f7fa8b58-6436-47b8-8741-9e90c231669e&pf_rd_p=f7fa8b58-6436-47b8-8741-9e90c231669e&pf_rd_r=AMGCQN30WX6XHZX8F3G2&pd_rd_wg=f1RDU&pd_rd_r=e0567865-56e7-4f14-9e7b-0babe015ad34&pd_rd_i=B008YEHRUK&psc=1

[L16pilot]

SWift's 94UL has been around for almost 10 years...just not widely known or available. Recent initiatives to eliminate lead in aviation gas (100LL) has increased visibility and prompted others to join the effort including GAMI with their G100UL. IMO, both offer advantages over 100LL (aside from the lack of TEL), and I see no downside to using 94UL or G100UL, especailly since the shelf life is significantly longer than ethanol free mogas.

[427yenko]

I have heard of the 100UL version as well, although that is not available around my neck of the woods. What other advantages are you speaking of that the UL versions have over 100LL?

[L16pilot]

I have heard of the 100UL version as well, although that is not available around my neck of the woods. What other advantages are you speaking of that the UL versions have over 100LL?

TEL can leave deposits in the combustion chamber, especially on low compresion engines and in engines that idle or run at low rpm for extended periods and contaminates the oil. I've heard it said oil change intervals can be extended using unleaded fuel in aircraft engines.running unleaded fuel in aircraft engines can extend oil change intervals.

[L16pilot]

Oh, and to be clear....I love 100LL overall. The downsides are minor IMO and are far outweighed by the benefits of high octane, affordability, availability, consistency of tune and long shelf life.

[L16pilot]

Just a follow up on the UL94 discussion...just read this article today in the Oct 2024 issue of Piper Flyer magazine. Take into consideration trying to directly compare air-cooled aircraft engines to water-cooled automotive engines is in large part apples-to-oranges, but thought it interesting...