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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Jetting Changes for Oxygenated Fuel
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[QUOTE="Rich Rohrich, post: 500248, member: 16241"] I've personally found the better the overall combustion and scavenging characteristics of the engine the less this tends to be true. I'm convinced (purely speculative on my part) that OXY fuels react differently in the presence of spent exhaust gases in the chamber than non-OXY fuels. By that I mean, the characteristics that Jaybird is describing seem much more pronounced when scavenging is poor and there is a greater percentage of residual exhaust products trapped in the chamber, like when a pipes characteristics are mismatched to the engine, or the transfers don't scavenge as well as they could. It [b]seems[/b] to me that given the same engine, non-OXY fuels like C12 or B32 are less likely to be as sensitive to this. INcreasing compression and cleaning up the transfers along with reducing transfer port area on my 2001 CR125 made the bike much more tolerant of a wide range of weather conditions on various OXY fuel blends including nitro-propane-2 , compared to before the mods. I'm trying to figure out if there is a reasonable science based cause and effect relationship to all this, but at this point it's mostly just anecdotal ramblings on my part. :thumb: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Jetting Changes for Oxygenated Fuel
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