Quote:
Originally Posted by
josephau (Post 83930)
Call me completely untechnical and my physics didn't score very well in high school. I remember one said that if I have such K&N airfilter or any mods that "improves" the airflow, therefore, the fuel consumption would increase, 'more air burns more fuel', that's the logic. I thought about it a lot, and came to speculate that first we need oxygen, spark, and combustible materials to make a fire. If the spark is constant, then the amount of oxygen and combustible materials needed should be the same, so if more oxygen, less combustible materials needed, and vice versa. So wouldn't more airflow actually decrease the amount of required combustible materials which are gasoline in our cases here, assuming we hold the size of the fire or in our cases the power from the engine constant? Why I hold the power from the engine constant, because the fuel injection senses how much fuel the engine needs in order to keep the idling speed at 1500rpm on one hand, and the presumably optimal amount of fuel depending on the throttle position on the other. The fact is I have tried both the stock and K&N filter, and I have found the stock filter actually eats more gas than the K&N filter, but I just couldn't quite get my head around it. On power commander, am I correct that its main function is to manage the smoothness of power delivery but not so much on increasing power at any rpm?
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Hi Josephau - I can see your thinking, but that's not quite right... the optimum burn ratio for a petrol engine is about 15:1 I believe, so if you have more air then you are going to need more petrol...
However, as the engine is arguably now working more efficently, you might find you use less throttle for a given engine speed/road speed, and therefore save fuel? Certainly the bike does feel a bit 'corked' as standard, so you tend to wind the throttle open harder than you might if it were breathing more freely?
I too would be interested to see how significant the change in fuel consumption is with the snorkle removed...
xxx
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