100 LL av gas
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100 LL av gas

  1. #1
    Senior Member 69 wriedt devil's Avatar
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    Default 100 LL av gas

    What does anyone think about running av gas in a BBC w/blower?

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    Senior Member jockorace's Avatar
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    I ran 100LL for years when we were in Lakeport on my blown deal. All of the ski racers ran it too. Added a little Marvel Mystery oil in the tanks. I then split a 55 gal. drum of Toluene with ski-racer Hal Reidel and mixed in 10% to bump the octane a bit higher. That fuel supported 17% over on the blower (13psi boost) spinning 7,200. The best thing about 100LL (in late 80"s) was.....$1.78 per gallon! Jocko

  4. #3
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    Default Av gas

    I ran it all last year on my old blown 509. Ran it at 15lbs boost, 8 to 1 with alum heads, and a chiller. Ran a little marvel oil to keep the pump and hoses happy. No issues at all with ac gas. On the new 540 it did cost a very small amount of hp compared to race gas. I'm running pump gas now. Av gas is usually about 1 buck more than 91 where I am. Great gas for the $$$.

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    Senior Member 69 wriedt devil's Avatar
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    Awesome. I work for an airline so I'm around av gas. 5.58 gal. How much marvel for a 10 gal tank?

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    Head Janitor FormulaZR's Avatar
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    Av Gas also keeps longer...so if you use Stabil in your pump gas; you can factor that into the cost to see if Av Gas is cheaper.


    Be careful, though - two airports I have been to recently (with my airplane) have had "tainted" fuel - they were separated by over 600 miles. AvGas has a VERY different smell than pump gas (Av Gas is low odor, blue, and almost good smelling), so if it smells wrong take it easy with the boost.


    Also, for future reference for others who may ask this question - 100LL will damage O2 sensors in short order.
    Last edited by FormulaZR; 08-17-2011 at 11:31 AM.


    "No, my boat doesn't need any more power" - No one ever

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    Default Scary....

    Quote Originally Posted by FormulaZR View Post
    Be careful, though - two airports I have been to recently (with my airplane) have had "tainted" fuel - they were separated by over 600 miles. AvGas has a VERY different smell than pump gas (Av Gas is low odor, blue, and almost good smelling), so if it smells wrong take it easy with the boost.
    Also, for future reference for others who may ask this question - 100LL will damage O2 sensors in short order.
    Nice!!! It aint like you can "paddle" your plane back to the airstrip..... Did you have a real failure, or just shitty performance? Any engine damage?.....
    Ray
    LOUD BOATS SAVE LIVES

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    Head Janitor FormulaZR's Avatar
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    Quote Originally Posted by Moneypit View Post
    Nice!!! It aint like you can "paddle" your plane back to the airstrip..... Did you have a real failure, or just shitty performance? Any engine damage?.....
    Ray
    Ha ha, that's true - but like Ron White says, you can be first to the scene of the crash...


    No damage - both smelled an awful lot like MoGas. It didn't really catch my attention until I couldn't lean the airplane as much as normal and then thought back to the last fuel stop. I told both FBO's about it, both had their fuel tested, and sure enough both had substantial quantities of MoGas mixed with the AvGas. I drained the tanks both times; and was compensated some of the $$ for it. My aircraft is not STC'd to run MoGas due to it's "high" compression. Ethanol does pose problems with an aircraft fuel system not designed for Ethanol especially if it sits for a substantial period of time, so that was some of the concern. Both did have at least some Ethanol content - that is checkable by an end user with only a rain gauge, bottle of water, and the fuel in question.

    AvGas also has a distinct smell when it burns...


    Probably two very isolated incidents and I'm just "lucky" - just wanted folks to be aware that it's fairly easy to tell if you have AvGas or MoGas; would hate for someone to have the wick turned up with less octane and lead than they expect.
    Last edited by FormulaZR; 08-17-2011 at 12:30 PM.


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    What locations were the tainted fuel at? I Am in the northwest. Also not STC'd for the mo gas but the low compression round motor is approved, though I have never ran any.

    You can land anyware once.
    That is a fan to keep the pilot cool. If you don't belive it just watch them sweat when it quits turning.

    To keep on topic I buy the 110LL mostly through Av center and save twenty cents a gallon going prepaid card. It helps with the habit and you have to pay sooner or later anyhow.
    Last edited by bottom feeder; 08-17-2011 at 01:16 PM.

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    Head Janitor FormulaZR's Avatar
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    Quote Originally Posted by bottom feeder View Post
    What locations were the tainted fuel at? I Am in the northwest. Also not STC'd for the mo gas but the low compression round motor is approved, though I have never ran any.

    You can land anyware once.
    That is a fan to keep the pilot cool. If you don't belive it just watch them sweat when it quits turning.

    To keep on topic I buy the 110LL mostly through Av center and save twenty cents a gallon going prepaid card. It helps with the habit and you have to pay sooner or later anyhow.
    First one was KSWW, I would have to go back through records to find the other one...it was around St Louis, MO.


    Hate to booger up the thread - but what do you have flying with a hairy chest engine? I missed a Fairchild F24W46...I nearly cry everytime I think about it...


    "No, my boat doesn't need any more power" - No one ever

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    Not to booger yet. And to keep it on track yes on the 110LL in blown BBC. Rember the plug readings change with the lead.

    Formula ZR PW R985/DHC-2 on wheels.

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    Head Janitor FormulaZR's Avatar
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    Quote Originally Posted by bottom feeder View Post
    Not to booger yet. And to keep it on track yes on the 110LL in blown BBC. Rember the plug readings change with the lead.

    Formula ZR PW R985/DHC-2 on wheels.

    Dang nice flying machine! Good point on the plug reading...


    And yeah, AvGas is like 85% of race gas at 50% price.


    "No, my boat doesn't need any more power" - No one ever

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    Thank you. Whats your bird?
    Its all about boats and birds They are the ultimate freedom machines.

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    Head Janitor FormulaZR's Avatar
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    65 Mooney M20C, 69 American Aviation AA1 (pre Grumman involvement), and a JDT v-max/mini-max hybrid homebuilt experimental/ultralight...


    "No, my boat doesn't need any more power" - No one ever

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