100 octane fuel melt catalytic converters?

[rlddlr53]

Will 100 octane fuel melt catalytic converters?

For smog, My HC are 147, max 86

I used 5 gallons of 91, 1 gallon of 100 when I got those numbers @ 15mph

My nox, and co levels were under maximum for everything else

[Raxe]

Why are you running 100 octane without a proper tune in the first place?

[Balleristic31]

Because racecar?

[Joe G]

^ definitely because racecar

[Dj Buttchug]

only if its leaded... if unleaded then no.

[Dj Buttchug]

oh yea and btw, higher octance fuel wont reduce your HC and CO. octane is the fuels ability to resist burn. so yea hotter boom but still not going bring the numbers down in most cases.

[u3b3rg33k]

only if its leaded... if unleaded then no.

Still won't burn it up. Just make it not work.

[Grant318is]

If it was an E36 M3, no because racer. On your average E30 be careful.

[u3b3rg33k]

is your converter melt by the octane? i dont know if mine does since i own race car. any help on this please. thanks.

x10,000

[Morrison]

Put a quart of xylene in with about 4 gallons of regular premium fuel. My old Eagle Talon passed emissions on this combo with no cat whatsoever.

[nando]

why on earth are you using 100 octane in a street car?

what does that cost, about $8 a gallon?

[delatlanta1281]

Instead of spending all that money on higher octane fuel, why not donate to a worthy cause? For instance Nanado has a worthy cause in his sig.
And no. You won't burn it up. Not in 5 gallons.

[jlevie]

If anything I'd expect the HC numbers to be worse. The engine doesn't have the compression ratio and ignition timing to get higher octane fuel to burn.

What does come to mind are intake leaks, a engine running cold, leaking injectors, or a bad O2 sensor. Intake leaks cause fuel trim to increase as will an O2 sensor with 100k on it. Smoke test the intake, fix the leaks it turns up, and replace the O2 sensor. Check engine operating temperature to see if the thermostat is bad.

Oh yeah partial misfires from bad/wrong plugs, aged ignition wires, or a bad distributior rotor or cap are obvious possibilities.

[u3b3rg33k]

If anything I'd expect the HC numbers to be worse. The engine doesn't have the compression ratio and ignition timing to get higher octane fuel to burn.

Just an FYI, 105 octane fuel ignites with a grill igniter just fine. you don't have to "get" the fuel to burn unless your pre-ignition (meaning before - not talking about combustion mishaps) cylinder pressure is so high that you're having spark blowout.

As proof - I point to our 6.75:1 CR farm tractor that will burn e85 with no trouble.

http://www.rockettbrand.com/techsupport/documents/TechBulletins/FlameSpeedOctaneAndHpRelationships.pdf

Octane Number: The octane number of a gasoline has little to do with how fast it burns or how much power the engine will make. Octane number is the resistance to detonation. If the octane number is high enough to prevent detonation, there is no need to use a higher octane gasoline since the engine will not make any additional power. Octane number is not related to flame (burn) speed either. Variations in octane quality are independent of flame speed. There are some high octane gasolines in the marketplace with fast flame speeds and some with slow flame speeds. It depends on how they are put together.

In short; gasoline ignites like gasoline. if it's not gasoline, it's not gasoline, and might burn differently. but if it's 85 octane high altitude gas, or 94 octane shell gas, it's still gas.

Flame speed barely matters - thank swirl for that. How else would you finish burning fuel in time @ 14,000 rpm?