Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
The strap types spread the clamping load over as much of the surface of the can as possible, but the strap itself doesn't have much purchase on the filter body. The spider types use multiple 'fingers', to do pretty much the same thing as the channel locks.... twisting the wrench to turn the spider, causes the fingers to clamp into the filter as well as start the twisting motion.
The end cap designs are meant to use the 'flutes' on the filters end, to use the whole filter like the nut on the end of the K&N design.... again, more surface area should reduce the stress on the sheet metal of the filter.
The K&N nut is a convenience, that only works if the filter wasn't used in that locktite commercial. Since it's stamped into the same sheetmetal as the rest of the filter body, there's not much in the way of mechanical strength to prevent it getting distorted. the only reason it holds up at all, is due to the complex shape it's stamped in. All those 90° bends stiffen it up to a degree.
All of these designs have limited purchase area, with the location of the filter on my '09. There's a gutter sort of arrangement under it, which sticks out from the case to aim any drips away from the motor. That gutter interferes with almost every filter wrench design I have tried -- limits the depth to which I can 'grab' the filter.
All of this has proven to be such a PITA, that I have resorted to the channel lock approach. The only merit of this is that I know it works, every time. I can only get about 1/8th of a turn, so I generally have to do it 2-3 times to break a filter free -- but it gets me where I need to be. My plastic filter end cap 'socket', I use to get that 1/4 turn past contact after I install the new filter. any more torque on the thing than that, and it distorts and pops off the filter.
"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "