19 Jun 2025, 18:58 [ UTC - 5; DST ]
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Post subject: New member in Houston, TX - Unleaded avgas project lead  Posted: 04 Jun 2025, 15:37 |
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Joined: 06/02/25
Posts: 21
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Hi All,
I am not a pilot but I am an aviation enthusiast and the project lead for Lyondell's unleaded avgas program since 2018. I am joining the forum to be a resource to those of you with questions about unleaded avgas development. I am a chemist by training with 38 years of experience in the industry. Looking forward to your questions.
Dan Pourreau
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 15:47 |
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Joined: 05/16/16
Posts: 691
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Location: KHFD(Hartford CT)
Aircraft: 1976 V35B
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Username Protected wrote: Welcome. This should be fun, and maybe even informative.  And probably painful for Dan.
_________________
MarkO
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 16:34 |
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Joined: 02/13/10
Posts: 20224
Post Likes: +24916
Location: Castle Rock, Colorado
Aircraft: Prior C310,BE33,SR22
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Username Protected wrote: Hi All,
I am not a pilot but I am an aviation enthusiast and the project lead for Lyondell's unleaded avgas program since 2018. I am joining the forum to be a resource to those of you with questions about unleaded avgas development. I am a chemist by training with 38 years of experience in the industry. Looking forward to your questions.
Dan Pourreau Daniel, Welcome to BeechTalk. There had been considerable discussion on this forum about unleaded Avgas.....as you might imagine. Here's a thread that has been going on for the past couple years about the GAMI product: viewtopic.php?f=7&t=221112Happy reading!
_________________
Arlen
Get your motor runnin'
Head out on the highway - Mars Bonfire
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 16:52 |
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Joined: 06/02/25
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Username Protected wrote: Welcome. This should be fun, and maybe even informative. And probably painful for Dan. 
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 16:54 |
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Username Protected wrote: Welcome. This should be fun, and maybe even informative. Thanks Stan. I do hope it's just that: fun and informative. 
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 17:11 |
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Joined: 06/02/25
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Username Protected wrote: Hi All,
I am not a pilot but I am an aviation enthusiast and the project lead for Lyondell's unleaded avgas program since 2018. I am joining the forum to be a resource to those of you with questions about unleaded avgas development. I am a chemist by training with 38 years of experience in the industry. Looking forward to your questions.
Dan Pourreau Daniel, Welcome to BeechTalk. There had been considerable discussion on this forum about unleaded Avgas.....as you might imagine. Here's a thread that has been going on for the past couple years about the GAMI product: viewtopic.php?f=7&t=221112Happy reading!
Thanks Arlen. I have been following the debates on various forums for a few years. There's often a lot of heat and not much light, but there is also some useful information. I usually stay out of the fray. But I like to hear what people think and I am happy to answer honest questions about our fuel and the PAFI program. I'll do my best to stay in my lane.
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 17:50 |
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Joined: 05/01/14
Posts: 9432
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Location: Операционный офис КГБ
Aircraft: TU-104
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Username Protected wrote: I am happy to answer honest questions about our fuel and the PAFI program. I'll do my best to stay in my lane. What engines/airframes do you expect your fuel to be approved for without modifications? Which ones with modifications? Which ones do you not expect approval for? Are there any weight or performance differences from 100LL? Will your fuel be 100% fungible with 100LL and G100UL? How about Swift 100R?
_________________
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Flight suits = superior knowledge
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 18:13 |
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Username Protected wrote: I am happy to answer honest questions about our fuel and the PAFI program. I'll do my best to stay in my lane. What engines/airframes do you expect your fuel to be approved for without modifications? Which ones with modifications? Which ones do you not expect approval for? Are there any weight or performance differences from 100LL? Will your fuel be 100% fungible with 100LL and G100UL? How about Swift 100R?
Hi Matt,
What engines/airframes do you expect your fuel to be approved for without modifications?
Can't list them yet, but I am told about 80% of the fleet with no mods or changes in operating envelope.
Which ones with modifications?
Another 10-15 % with minor modifications like timing adjustments and minor changes to operating envelope. The rest with major mods up to and including changes in CR.
Which ones do you not expect approval for?
None.
Are there any weight or performance differences from 100LL?
No weight difference. It has the same density as typical FBO 100LL. Performance-wise, it has lower detonation margin than 100LL. Our fuel is completely miscible with 100LL and has synergistic octane response. The FAA and OEMs routinely test the fuels mixtures to ensure compatibility with each other and performance in the test engines.
We have not evaluated compatibility with G100UL or Swift 100R nor do we plan to. We think it is unlikely either STC'd fuel will find widespread acceptance, especially without an ASTM standard. We also will take steps to ensure that the fuels are not intermixed in the field for liability reasons.
Dan
Last edited on 04 Jun 2025, 18:20, edited 1 time in total.
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 18:18 |
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Joined: 06/02/25
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Username Protected wrote: Thanks Charlie! I know you pilots can be an ornery bunch. I'll do the best to roll with the punches and not take anything personally. 
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Post subject: Re: New member in Houston, TX - Unleaded avgas project lead Posted: 04 Jun 2025, 18:30 |
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Joined: 02/13/10
Posts: 20224
Post Likes: +24916
Location: Castle Rock, Colorado
Aircraft: Prior C310,BE33,SR22
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Username Protected wrote: We have not evaluated compatibility with G100UL or Swift 100R nor do we plan to. We think it is unlikely either STC'd fuel will find widespread acceptance, especially without an ASTM standard. We also will take steps to ensure that the fuels are not intermixed in the field for liability reasons.
Dan Well now, those are “interesting” statements.
_________________
Arlen
Get your motor runnin'
Head out on the highway - Mars Bonfire
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