4 replies to this topic

[BenCoul]

Not too sure if this is where to post this by the way, but...
My 998cc has a K&N air filter, and my dads a pancake, which is best as i just fancied a bit of bragging lol
and what is the difference is any?

Edited by BenCoul, 26 October 2010 - 02:09 PM.

[Carlzilla]

The k&N is the better one as the airflow rate is much higher and filtration seems to be better , plus theyll last you a lifetime. Not cheap though at around £40

The pancake filters are just cheap bits of kit which basically have a bit of foam in to stop crap getting into the engine, cost about a tenner but do look better than the standard airbox

The air flow is pretty much to do with the surface area of the filter, as theres much more for air to pass through on a cone filter than a pancake filter

Edited by Carlzilla, 26 October 2010 - 02:17 PM.

[Cooperman]

If the K & N has a stub-stack, it should be slightly better than a 'pancake' filter.
A K & N without a stub-stack is likely to be the same as a pancake. The advantage is gained by having a 'bell-mouth' to the inlet to smooth the entry of the air flow and thus maximise the 'inertial-ramming' effect. Just putting a 1/4" radius on the carb intake helps a little if you make the flat inner surface of the filter aperture a bit bigger.

[big yin]

depends wether the K&N is a replacement element, or cone really. if its a cone, as said previously it needs some sort of ram pipe/stack. if its done right, you could get away with putting a radius on the carb mouth (so long as the opening in the K&N is bigger than the outside diameter of the radiused carb mouth)

but yeah, 50k miles between cleaning/re-oiling and million mile/10 year warranty is always a good thing!!

[Cooperman]

The original 'pancake' filters as fitted to early Cooper 997's were filled with steel wool type stuff and you just washed them out with petrol or paraffing.