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alfadriver wrote:
Jensenman wrote:
carguy has it exactly right. There is no net reduction in pollutants, merely a dilution. Sort of like the difference in dropping 1 oz. of food coloring in 1 gallon of water vs. dropping that same ounce in 10 gallons of water.
There is no 'post oxidation effect' because the engine has no catalysts. I have personally had my grubby digits in those motors, so I know first hand.
But it makes the EPA happy.
What year was it?
I know for a fact that we are allowed to dillute our exhaust all we want, and it does not matter one iota. Every gram that comes out is counted, whether it's in 1 gal of air or 100 gal of air.
The rule is grams/cycle. Dilluting the mixture does not change that.
BTW, you can have post oxidation without a catalyst. We have used it before. Once the exhaust gets to 600 deg, it will start oxidizing the excess HC with enough raw air available. It will not reduce it enough for modern car standards, but it does work.
Eric
Honda still builds that bike. Here's a pic of the .08 model:
And here's a pic of an earlier bike (I think it's an '06) showing the 'octopus'. It's the aluminum doohickey with all the hoses on it, just above the round left side crankcase cover.It uses the exhaust pulses to create a vacuum which draws filtered air from the carb's air intake through the 'octopus' and then to passages cast into the head which allow the filtered air into the exhaust stream.
Sorry for the humongous pics, they are the only ones I could link. Maybe there's a difference between automotive and motorcycle emissions testing, I dunno. Honda even said, when the bike first came out, that the octopus was for exhaust dilution.
Something which HAS changed: see the black canister below the left radiator shroud? That's an adsorption canister, just like a car. That was added in, I think, '05.
