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Thread: Auto Fuel STC future

  1. #21
    Gilbert Pierce's Avatar
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    Default Re: Auto Fuel STC future

    Quote Originally Posted by Throttle Pusher View Post
    If it was cheaper we would buy more.
    Buy about a million gallons and see if the price drops -please-

  2. #22
    KSG's Avatar
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    Default Re: Auto Fuel STC future

    The engines that require the 100 ll are typically only turbo engines. They run hotter and need that extra octane to ensure that they don't detonate. The io540 in my Cherokee 6 is less than 10to1 compression as are all the certified engines I know of. 100ll is overkill for them but 93 unleaded probably wouldn't be enough. Aviation needs 2 fuels! Stabilized unleaded without ethanol or 100ll. Lead levels used will drop and turbo motors will still run. 2 tanks can't be that expensive or difficult to maintain for fbos.

  3. #23
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    Default Re: Auto Fuel STC future

    Quote Originally Posted by KSG View Post
    100ll is overkill for them but 93 unleaded probably wouldn't be enough.
    I regularly run my 0-320-150 on 87. should i not be using that octane level?

  4. #24

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    Default Re: Auto Fuel STC future

    87 octane is fine for the 150hp o-320 and is allowed per the STC.

  5. #25
    Gilbert Pierce's Avatar
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    Default Re: Auto Fuel STC future

    Quote Originally Posted by danP View Post
    I regularly run my 0-320-150 on 87. should i not be using that octane level?
    I have been running 87 octane in my O320-150 for 14 years with no problems.

  6. #26

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    Default Re: Auto Fuel STC future

    I've been running 87 mogas and I have noticed my primer is getting harder to pull out and push in. I put new o-rings in a couple of years ago. Anyone know if there is a Viton replacement or has anyone experienced their o-rings deteriorating?

  7. #27
    Administrator Steve Pierce's Avatar
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    Default Re: Auto Fuel STC future

    I see that with 100LL as well.

  8. #28
    Gilbert Pierce's Avatar
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    Default Re: Auto Fuel STC future

    Quote Originally Posted by kloudking1 View Post
    I've been running 87 mogas and I have noticed my primer is getting harder to pull out and push in. I put new o-rings in a couple of years ago. Anyone know if there is a Viton replacement or has anyone experienced their o-rings deteriorating?
    Those are standard size "o" rings and can be purchased in Viton. I put Viton "o" rings in and several years later I had the same results. Bad stuff in our fuel these days.

  9. #29

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    Default Re: Auto Fuel STC future

    Check and clean the primer nozzles at the cylinders. They can get clogged up/restricted and make your primer difficult to push in. Thus the o ring in the primer is not the problem at all.
    Tom Ferraro
    PA22/20-160 N25TJ

  10. #30

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    Default Re: Auto Fuel STC future

    Thanks guys. I'll check it out.

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