Quote, originally posted by THE VIBERATOR Â»whats wrong with going filterless?You might start by considering that all car makers consider it an excellent idea to include an air filter in their products even though this adds cost and has a slight effect in decreasing performance and economy. Since they all seek to minimize costs and also to maximize performance and fuel economy there must be compelling arguments in favor of including air filters.The air around us normally contains small dust particles of which some are sand, or silicon dioxide, an extremely hard, abrasive substance. This is especially true on windy days or when near construction zones. Letting those tiny sand particles get into your engine will greatly increase the rate of wear of the internal parts. Note that these particles have a melting point considerably higher than the combustion temperature inside the cylinders so they will remain intact and coat the inside cylinder walls and the other components such as valve seats, etc. Then when the pistons move up and down and the valves operate, the particles act as a grinding agent. I wouldn't expect to see any negative effects immediately, but the lifetime of the engine will be reduced. Some people do choose to run filterless for short periods of time - such as for a drag strip run. But doing so for everyday driving is likely to lead to some very expensive repair bills.BTW, the K&N filter has been shown to be very poor compared to typical OEM paper filters at trapping fine sand/dust particles. See:http://duramax-diesel.com/spicer/index.htmfor
a detailed test. Although this was performed on diesel truck engine filters, I'd expect the results to hold true in relative terms for small car engines as well.There's a more subjective test here:http://www.bobistheoilguy.com/...3.htmwhich
came to similar conclusions about the K&N.I'd note how much more effective the OEM type filters are at holding large amounts of airborne contaminants before needing replacement. Given the numbers shown in the first test above, it's far more cost effective to replace the OEM filters when needed compared to the more frequent cleanings that would be required for the K&N type of filter - and it's also much more convenient.