100LL av gas opinions

Concept Carbon

Concept Carbon

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Joined
Jan 31, 2006
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Location
Ottawa, ON.
I can get some cheap if not free 100LL from work, what are the pros and cons fom running this.

I did a search and read somewhere that it can actually cause you to loose hp??
 
You only need as much octane as you can properly utilize. If you use too much the sled will become harder to start; lose throttle response & be down hp. You want "just enuff" octane to prevent detonation to get the most power from your engine. I see way too many people throwing in premium or av gas in a sled made for regular & thinking they will gain power when the opposite will happen. It even happens in my turbo if i run race gas at 10 pounds boost then the sled runs like crap cus it needs 93 octane.
 
thanks so if i was goign to go drag for the day and swap my heads out or run a tighter squish it could help.

I brought this up cause a guy at my work filled his old moto ski 377 up with it and said it runs like crap, i told him not to run av gas but he insisted. He aslo said he couldnt get it to start lol
 
Mix

Mix it 50/50 and the machine will run good. I wouldnt run it straight.
 
Aviation fuel has no lubricant properties in it, so you should never run it with only av gas. I wouldn't even go as far as mixing it 50/50. If you want more octane, buy VP, Torco, or Sunoco race fuels. Also, since octane is defined as the resistance to burn, higher octane, the harder it is to burn fully, and it burns slower. You need to compensate for this with compression (or timing) to have the fuel burn fully.
 
Did it

I ran it in a 250r Fourtraxx no problems with 50/50, ran cooler..smelled gooooood but didnt run it ALOT just once in awhile. Wouldnt octance boost be cheaper?? I ran that stuff ages ago((av fuel)) when it didnt cost our 1st born.
 
valin said:
Aviation fuel has no lubricant properties in it, so you should never run it with only av gas. I wouldn't even go as far as mixing it 50/50. If you want more octane, buy VP, Torco, or Sunoco race fuels. Also, since octane is defined as the resistance to burn, higher octane, the harder it is to burn fully, and it burns slower. You need to compensate for this with compression (or timing) to have the fuel burn fully.
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I thought the lead was the lubricant.
 
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