Proof that the simple carburetted two stroke is going to remain the mainstay of karting for the forseeable future.
The addition of the latest catalyst technology can clean up exhaust emissions (HC,CO,PM)by 80-99%. Particularly notable is that modified DPF technology can clean up particulate ( white smoke emissions) by 99%. White smoke is the most visible manifestation of the two strokes unclean ways.
This is a much simpler solution to reducing emissions than direct injection two stroke or the introduction of 4 stroke technology.
Bear in mind this solution is very cost effective since it is being applied to scooters in the emerging markets.
However it doesn't improve the two strokes fuel economy, like a direct injection system, but this doesn't really matter in karting.
http://www.meca.org/galleries/default-file/Motorcycle%20whitepaper%20final%20081908.pdf
"....It is estimated that conversion efficiencies of an oxidation catalyst on a two-stroke engine are on the order of 50% for HC, 50% for CO, and 45% for PM without the use of secondary air. The addition of secondary air injection is estimated to increase average conversion efficiencies to approximately 80% for HC, 75% for CO, and 70% for PM.
While two-way oxidation catalysts are effective in reducing the soluble component of PM or SOF, some manufacturers are developing catalyzed particulate filters for two-stroke 50cc scooter exhaust. In addition to performing the oxidative function to reduce CO and HC these high porosity wall flow filters were shown to reduce 99.5% of the PM with little to no backpressure increase above the stock configuration after 16,000 km durability testing...."
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2-stroke emissions slashed 80-99% with simple cat by 'squidly01' << You are here!
