Interesting. My bike typically runs in the 103-105 range. Last summer I ran for an hour or so in a bit higher elevation, 2nd/3rd gear 20-30 mph for over an hour. Dirt roads, state forest and cool. I get home and I'm at 110. The next day, a typical ride, and I'm back to 103.9. The bike never saw WOT. Why the correction?
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To much air??
- Thread starter migs16
- Start date
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Interesting. My bike typically runs in the 103-105 range. Last summer I ran for an hour or so in a bit higher elevation, 2nd/3rd gear 20-30 mph for over an hour. Dirt roads, state forest and cool. I get home and I'm at 110. The next day, a typical ride, and I'm back to 103.9. The bike never saw WOT. Why the correction?
ich
Well-known member
- Joined
- Oct 6, 2010
- Messages
- 685
epa regulations do not require bikes to run lean, this is just another bullshit. epa rules sum up nox and hc emissions, which in fact makes it easier to run the bike on the rich side (contrary to japanese or ece rules, but i'm sure you knew that already). epa defines an amount of exhaust gases permissible to emit when running their drive cycles. they do not remotely care how the engine passes the test. a bike running lean is not a bike running clean nor is it running rich nor running stoich. just the mixture of exhaust gas changes and it's the task of the manufacturer to provide measures that epa limits are met. technical requirement must be met also, cause high temp + free oxygen + piston metal = big boom. running rich at wot is done only to remove free oxygen from hot combustion and exhaust gas and is done so for ages for exactly this reason. this is why buells (as almost all other ic vehicle engines) do not run lean at wot. rise in torque is no more than a nice side effect. modern ic engine do not run lean in any other area also, cause the catalyzers will stop working well then (with the exception of lean burn engines, of course), but non-catalyzed, carbed engines ran above afr 17:1 in partial load for decades to reduce fuel consumption.
some chassis designers better keep their mouths shut if it comes to engine and fi design. commonly turns out to be just embarrassing for them.
afr 16:1 is not lean. lean is a technical term, defined as lambda > 1.1 (which is afr 16.2 at minimum for gasoline fuel).
