LEADED vs UNLEADED

[ray66v]

From here:
Avgas - Wikipedia

"100/130 avgas has an octane rating of 100 at the lean settings usually used for cruising and 130 at the rich settings used for take-off and other full-power conditions."

Yes, using aircraft octane performance ratings you can get those numbers.

If you test the exact same sample, using automotive octane ratings, (R+M/2 method), you get like 96 octane. Which is doable now in unleaded.

The vast majority of aircraft are low compression, and do not need high octane fuel. So, even if they kept 100LL for the high compression engines, 80% of the lead could be eliminated, by switching the rest to regular unleaded.

 

[buickanddeere]

None of that is relevant, or makes any sense.

Read and learn . Octane rating - Wikipedia

 

[buickanddeere]

None of that is relevant, or makes any sense.

Read this too. Where do you see the 100LL ?
Octane rating - Wikipedia

 

[fried1765]

From here:
Avgas - Wikipedia

"100/130 avgas has an octane rating of 100 at the lean settings usually used for cruising and 130 at the rich settings used for take-off and other full-power conditions."

I feel now that I must confess.....
In my lifetime I have burned several million of gallons of 115/145.
There..........now I feel better.

 

[ray66v]

Read this too. Where do you see the 100LL ?
Octane rating - Wikipedia

What are you trying to say? Because none of that, changes my point.

 

[buickanddeere]

What are you trying to say? Because none of that, changes my point.

took another look at the numbers and I am going to have to “eat some crow”. You are correct , 100LL is similar to what 96 octane automotive road gasoline would be .

 

[ray66v]

I read today, there is 2 grams of lead in a gallon of 100LL. That is much more than I expected, and I have spent a lot of hours cleaning lead out of aircraft spark plugs.

If you use what I believe to be a conservative figure of 150,000,000 gallons of 100LL burned per year, in the US, times 2 grams, and convert to pounds, it comes out to 661,386.79 pounds of lead each year?

No wonder the EPA keeps complaining about it.

 

[MossRoad]

I read today, there is 2 grams of lead in a gallon of 100LL. That is much more than I expected, and I have spent a lot of hours cleaning lead out of aircraft spark plugs.

If you use what I believe to be a conservative figure of 150,000,000 gallons of 100LL burned per year, in the US, times 2 grams, and convert to pounds, it comes out to 661,386.79 pounds of lead each year?

No wonder the EPA keeps complaining about it.

Yep. Avgas is the largest lead polluter in the country by far. I think people that burn it in their small engines should re-think it just on that alone. It's just not necessary.

 

[MossRoad]

I feel now that I must confess.....
In my lifetime I have burned several million of gallons of 115/145.
There..........now I feel better.

What did you burn it in?

I sold a lot of it working at airports.

 

[MHarryE]

Yep. Avgas is the largest lead polluter in the country by far. I think people that burn it in their small engines should re-think it just on that alone. It's just not necessary.

That’s what I’ve been getting at. Avgas is the primary lead polluter today concentrated around genav airports. Back when I was having my brain, heart and lungs scrambled by it, the concentration was by city freeways. The FAA does not state what test requirement cannot yet be met. Last thing I would want them to do is move without being positive and kill pilots and passengers but in fact they are damaging the lives of others.