On 2007-02-01 13:35, duckie wrote:
On 2007-02-01 07:53, johnshumpert wrote:
I put a K&N on my ZR7 and noticed a significant difference. I've never put one on my Triumphs because everyone says not to.
So, is the consensus with the K&N that yes, it's more free flowing but it blocks less debris and grime? If that's indeed the case I'm disappointed. You'd think there would be more technology working with the K&N than simply being 1/2 the air filter it should be.
I don't know about K&N's letting through more debris and grime, but I do know they work in a different way to normal paper filters as they use oil to attract the dirt and hold it in the filter material (cotton I think). Whilst the paper ones rely on just being a finer mesh which means they can get blocked quicker than K&N's. So it's not a case of K&N's (and other similar after market filters) having less filtration so that air passes through at a higher rate.
I've installed K&N's into cars and seen a big difference and I have a BMC filter in my sv650 which has made a difference but I think the major improvement on that bike was not the type of filter but the air box mod - i.e the tank was lifted with spacers to allow greater airflow and the hole on the top of the air box is about twice the size of the stock version so there is probably twice as much filter surface area available and I presume twice as much air available to the carbs. Of course with that set up the carbs had to be re jetted...
my other 2 cents...