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Thread: avgas

  1. #1

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    avgas

    Hey guys anybody run straight 100LL from the airport? Any pros, cons? I assume the apba and IJSBA still ban leaded fuels.

    I am adding this quote from shell

    Shell Avgas 100 LL is a gasoline fuel for reciprocating piston engined aircraft. Avgas 100LL
    has lean mixture octane rating of better than 100 whilst its rich mixture octane rating
    exceeds 130. The combustion performance is equivalent to Avgas 100/130. Avgas 100 LL
    with lead content of less than 0.56 gm/


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    There's been alot of talk about avgas. If I remember correctly, it's rated differently from pump gas. So 100 avgas is not the same as 100 pump gas. I believe it's actually rated lower.

    Beerdart would know more about this.

  3. #3

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    cool

    I was under the impression it was a bit higher. Our airport here says the octane is up over 105 and told me to call his vendor. We buy alot of jet fuel from them and our contract price is super cheap for avgas. Thanks you may be right. I know its not real lake friendly but we get all the offshore power boats out here running it.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by chopper901 View Post
    Hey guys anybody run straight 100LL from the airport? Any pros, cons? ...
    Quote Originally Posted by xlint89 View Post
    ...it's rated differently from pump gas. So 100 avgas is not the same as 100 pump gas. I believe it's actually rated lower...
    Quote Originally Posted by chopper901 View Post
    ...Our airport here says the octane is up over 105...I know its not real lake friendly...
    Search is your friend

    Avgas is indeed rated differently, and the lead content is significant.

    Since piston engine aircraft operate at various altitudes, and often at colder air temperatures while flying, the fuel octane is rated using different methods than for mogas (road engine motor gasoline).

    Beerdart contributed these AVGAS posts;
    http://www.greenhulk.net/forums/show...76&postcount=6
    http://www.greenhulk.net/forums/show...77&postcount=7
    Last edited by K447; 05-30-2009 at 02:54 PM.

  5. #5
    PolarisNut's Avatar
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    If you need high octane fuel, stick to the traditional racing gasoline. I'm not really sure how that whole "avgas" thing got to be what it is today. I know plenty of snowmobilers that swear by the stuff...I gave up trying to convince them otherwise.

  6. #6

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    Threads

    I'll check out them threads. I know the low lead properties really mean high lead content lower than previous product I guess. Thanks guys

  7. #7

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    wow

    Yeah I'll try the search next time.... Beerdart great information! Thanks for the links.

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by chopper901 View Post
    ...I know the low lead properties really mean high lead content lower than previous product I guess...
    Actually, the 'Low Lead' avgas is just lower in lead than the really high lead, high octane avgas (130-145 octane). All avgas has much more lead than pump gasoline (which has none).

    I am not sure whether 'racing' fuel has more or less lead than avgas...

    When I started reading about it, I was surprised how different the performance profile of aviation piston engines is for automotive and marine engines.

    Aviation engines must be reliable, for sure, but the rate of technological advancement seems much slower than I had expected.

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