***Post a MEME Thread***

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350LUV said:
Or Sunoco 260 … clear blue…

Right in the middle of the 70’s gas shortage (🙄)
I was driving my BBC Chevelle with two 4 barrels on a tunnel ram… luckily my buddy fueled planes at Opa Locka regional airport in Miami and kept me in avgas… iirc, it was green colored.. 😁
Click to expand...
Green was 100 Octane leaded, the good stuff but not the best and no longer sold, during and right after WWII they had purple that was 115/145 Octane and the best you could get, very volatile, you did not want to get any on your hands, contained lethal amount of TEL (Lead).

Purple is still being made in limited quantities by the drum only for special events, now at the Airports all that is available is Blue (100 low lead) and Red (80/85)

Octane was one of the reasons we won WWII, we had it, they did not!
 
350LUV said:
Or Sunoco 260 … clear blue…

Right in the middle of the 70’s gas shortage (🙄)
I was driving my BBC Chevelle with two 4 barrels on a tunnel ram… luckily my buddy fueled planes at Opa Locka regional airport in Miami and kept me in avgas… iirc, it was green colored.. 😁
Click to expand...
1970ls5 said:
Green was 100 Octane leaded, the good stuff but not the best and no longer sold, during and right after WWII they had purple that was 115/145 Octane and the best you could get, very volatile, you did not want to get any on your hands, contained lethal amount of TEL (Lead).

Purple is still being made in limited quantities by the drum only for special events, now at the Airports all that is available is Blue (100 low lead) and Red (80/85)

Octane was one of the reasons we won WWII, we had it, they did not!
Click to expand...
No coincidence Chevron White Pump was green. It wasn't poured back into the ground when it was reaching the mil-spec storage limit.

The 115-145 was possible because the Phillips Petroleum chemists developed the alkylation refinery process and that made it possible to produce large quantities of Iso-Octane (100 octane) and Triptane (100+ octane), and particularly both of those and other alkylates have the most sensitivity to octane increase per quantity of tetraethyllead added, and are very clean burning, so are the best basic hydrocarbons to use to make fuel for high output piston engines.

The aromatics, Benzene, Toluene and Xylene are high octane but sooty burning, like Acetylene, and attack soften and swell rubber, so Toluene is only used in small percentage (if at all) in Avgas.

Triptane was the breakthrough that made the 115-145 possible in large quantities for the compound supercharged-turbocharged radials in the B29 and other big bombers, and the Merlins in the P51, some of those with nitrous near the end of the war.

In the late '40s and early '50s the Signal Gasoline stations had a sign proclaiming "With Triptane"

The alkylates are still used as the main ingredients in 100LL today for the same reasons. I00LL has about half the lead as the old green 100-130 and purple 115-145, so it still has plenty.

Bonus is the metallic additive MMT (Methylcyclopentadienyl manganese tricarbonyl) is synergistic with TEL, so when the two are combined the effect of increasing anti-knock octane behavior of the fuel is better than either alone, and both TEL and MMT have the most effect of all additives available. Adding a tenth-gram of MMT per gram of TEL has the anti-knock effect of two grams of TEL.
 
 
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