Some say good some say crap. I am guessing that at first the performance air filter will give some gain but will clog up much faster than the regular filter and as a result flow less fairly soon after.

I have a KN filter in place of the original filter on my 88 305 TPI engine. I have not modified the air box yet though.


Basically, how many have went back to using the original air filters.....

Thanks

Sam

 

K&N's (and other oil-based air filters) advantage mostly comes into play when you compare dirty air filters. K&N filters flow just slightly more air compared to paper filters when both of them are new, but K&N filters start taking the lead when dirt and debris collect on both filters.

Reasoning behind this? The K&N filters do not remove as many particles from the incoming air as you might think. I don't know how K&N can claim to have better filtration than a regular paper filter (probably through some technicality), but there is generally a trade off between flow and filtering ability when it comes to car filters and the K&N is no exception.

My advice would be to switch back to cheap paper filters and change them as they get clogged.

 

My advice would be to look at something besides a surface-type filter, which requires holes in it that allows air through but tries to stop dirt. In order to get more air through, you either need to increase the surface area (of which there is a limit due to the space constraints under the hood), or the size of the holes (which will allow bigger dirt particles in).

Depth-type filters make the air turn small corners within them, which the air will do but the dirt won't. The typical type is open-cell oiled foam. The dirt is caught by the oil as it attempts to "turn the corners" in the foam cells. Air flow capacity is great, dirt catching capacity is much better than paper or oiled gauze, and they are cleanable and reusable.

 

I think i will dump the KN and put in a regular and change it as sugested or sooner Also I will do an air box mod.

thanks

Sam