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GlueGuy View Drop Down
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Posts: 2629 		Direct Link To This Post Topic: Octane grade for towing
    Posted: 28 Jun 2018 at 11:51am
Originally posted by lostagain

Yes, avgas still has high octane and lead.  Think of it as a crop duster spraying bits of lead all over us as they pass by.  Moral of the story, try not to live in the flight paths of a general aviation airport.
One other thing. Engines that need lead, don't need a lot of lead. If you threw in a tankful of 100LL, you could probably go the next 5 tanks with conventional no-lead high octane. The lead will stay on the valves for quite a long time. No easy answer for the ethanol though.
bp
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StephenH View Drop Down
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Posts: 6288 		Direct Link To This Post Posted: 27 Jun 2018 at 9:41pm
Originally posted by GlueGuy

I think you would be fine. The single octane they are talking about is 95 octane (they weren't clear on the method). There may be things you will have to deal with the lead issue. Likewise, the ethanol will be an issue for seals and such.

You can always go to an airport and get some 100LL....

The method I read was that the 95 was Research Method (The R in (R+M)/2). It apparently yields a higher number than the M method. I just read that the equivalent octane rating if were listed as current octane levels are would be about 91 octane.
StephenH
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mcarter View Drop Down
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Posts: 3419 		Direct Link To This Post Posted: 27 Jun 2018 at 5:00pm
+10, thanks.
Mike Carter
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Posts: 140 		Direct Link To This Post Posted: 27 Jun 2018 at 10:22am
Okay, I’m bored with this....lmao
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lostagain View Drop Down
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Posts: 2587 		Direct Link To This Post Posted: 27 Jun 2018 at 10:15am
Yes, avgas still has high octane and lead.  Think of it as a crop duster spraying bits of lead all over us as they pass by.  Moral of the story, try not to live in the flight paths of a general aviation airport.  
Never leave footprints behind.
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GlueGuy View Drop Down
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Posts: 2629 		Direct Link To This Post Posted: 27 Jun 2018 at 10:01am
Originally posted by mcarter

Simplify maybe. I have vintage vehicles that run on premium and need a lead additive.
I think you would be fine. The single octane they are talking about is 95 octane (they weren't clear on the method). There may be things you will have to deal with the lead issue. Likewise, the ethanol will be an issue for seals and such.

You can always go to an airport and get some 100LL....
bp
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StephenH View Drop Down
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Posts: 6288 		Direct Link To This Post Posted: 27 Jun 2018 at 9:45am
Of course, the vintage vehicles will have problems. No gasoline today is sold with tetraethyllead additives. I am sure that the ethanol also causes them problems as the gas lines and seals weren't made to tolerate alcohol either.
StephenH
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mcarter View Drop Down
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Posts: 3419 		Direct Link To This Post Posted: 27 Jun 2018 at 9:32am
Simplify maybe. I have vintage vehicles that run on premium and need a lead additive.
Mike Carter
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StephenH View Drop Down
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Posts: 6288 		Direct Link To This Post Posted: 27 Jun 2018 at 9:31am
+1
StephenH
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GlueGuy View Drop Down
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Posts: 2629 		Direct Link To This Post Posted: 27 Jun 2018 at 9:28am
It's clear from this discussion that there is merit to the notion of having one octane grade for all vehicles. It would certainly simplify things and allow us to work our brain cells on something useful.
bp
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