Back to "High test" gas?

[roadhawg]

Originally Posted by waterman

Mine doesn't ping 99% of the time. It is only on the hottest of days that I hear pinging and I run 85 octane here. We do have the benefit of altitude for that. I carry a small bottle of octane boost for those ocassions.

As far as changing octane, try the midgrade and if that still pings then move to the next higher octane. Run as low of octane as possible without pinging. If you run too high of octane, you will have carbon build up in the cylinders. Do not run avgas. That stuff is really high octane and meant for high compression engines.

I would be interested to know more about the bottle of Octane boost, what brand? where do you get it? how much you put in?
What is avgas?

I use seafoam from time to time, but this is for keeping the injectors clean, I dont
think it boosts the octane?

[waterman]

Originally Posted by roadhawg

I would be interested to know more about the bottle of Octane boost, what brand? where do you get it? how much you put in?
What is avgas?

I use seafoam from time to time, but this is for keeping the injectors clean, I dont
think it boosts the octane?

Just pick it up at Walmart. It's Gumout Octane Booster. I only put in an ounce when I notice pinging.

Avgas is Aviation fuel. That is very high octane and meant for a high compression engine.