Off On A Tangent
Hi Walt, Russ here, and glad to see you posting. I agree with your reasoning on having two standard rings rather than one for an everyday saw, but how did you determine that most saws that run only one ring also have marginal air filtration. If we are talking department store saws, sure, you`re right. But what I read here is a thinly disguised cheap shot at Husky`s Air Injection with the reference to centrifugal force. Of course the larger particles with a higher mass develop a higher kinetic energy to overcome the vacuum at the intake to the engine, but the smaller particles are affected as well. I believe that your message implies that it is more effective and thus beneficial to have larger particles impinging themselves on the filter, thus blocking passage of smaller particles. This is partially true but it doesn`t see the whole picture, large irregularly shaped particles generally have large voids between them. Any mechanical filter has a threshold size particle that it will pass, let`s say 1 micron for this example, when new and clean. The efficiency of this filter can be substantially increased by foreign material being trapped on the surface. You may be able to filter a particle as small as .5 micron on a used filter because the smaller particles lock more closely together. If your were to take a yard of #2 stone and a yard of sand, what gives the highest filtration efficiency? The sand of course. The voids between the larger particles are too big to aid filtration and you get what is known as channeling. The real proof is how much crud do you see in the intake. I haven`t noticed any substantial difference between Stihl and Husky. Has anyone else, other than one particular saw or filter of any brand? You might see breakthrough sooner on an Air Injected saw sooner if the filter is not maintained properly because of the increased differential pressure created. But that is just abuse anyway. Too many people assume they don`t have to maintain their filter with Air injection. Air Injection is only meant to increase the cleaning interval, not eliminate it. This is a valid enough issue that Stihl came up with their own, although somewhat more dubious solution. Intellicarb increases the lenth of the interval also, but at the expense of engine horsepower. Any carb that reduces the amount of fuel to the engine based on gross air flow, as indicated by filter differential pressure, is lowering the output power of that engine. I think Stihl is still smarting because Husky`s solution is actually almost supercharging the engine. RPMs are not always a bad thing either, and Husky doesn`t have "the rights" to high rpm saws. Most comparable Stihls run in the same range. Maintenance is just alot more crucial with these saws, but they pretty much the Pro saws anyway. If you got the bucks to lay down, you should learn how to take care of it. I`m betting I get some feedback and I`m all ears if it makes sense and it`s not just emotion speaking. Russ
