The K&N filters are known to shrink over time, whether from heat or some other reason. How old/ how many hours on the one in the first pic?
I've bought E-3450 from Autozone and it's the same as the one from Vans. Same K&N part #, stands to reason it's the same unit.
Same here.
Maybe someone can post the ID/OD of the replacement filter they bought (with no 'B' suffix) and I'll get the same on the new Van's filter.
K&N will replace filters that shrank under their 'million mile warranty'. I've had a few replaced.
So I guess the title should be changed to "The Amazing Shrinking Air Filters".
Just tell them you were running it in your RV, and it shrank.Correct... while down for condition inspection, just send yours back in for warranty if shrunk up, it is covered. they do shrink.
Just tell them you were running it in your RV, and it shrank.
Because of this post I've kept an eye on my filter, here it is after 31 hours on the tach. I'm curious if it's the filter or the installation/Fab that is making it shrink.
Did you install FAB drain tube?
I am wondering if those like me that installed the aluminum piece on the inside, which causes a little more clamping force on filter are having this problem?
Also what are your normal cruise altitudes? This filter is marginally sized for a 360 cu in at 2700 rpm, let alone my 540. If you fly low/high MP/high RPM a lot, you might be creating a higher pressure differential. I rarely fly low and rarely at high power settings due to birds(live and man-made).
Mine is exactly the same size after 135 hrs 2.5 yrs.
I'm curious, the folks that have had sever shrinkage (that's just funny) . . . I mean on your filter, do you fly in a lot of rain?
I had 25H TT on my filter before needing to do my condition inspection. I removed the filter which fit just fine, it did not snap off or anything odd. It sat for a couple hours, still fine. I washed it (K&N filter wash) , set it out to dry (breezy sunny day after a gentle air blow off). Was wrapping up and pulling stuff in to find one side of the filter had shrunk significantly, diametrically, over three hours of drying time. It looks like a trunchated cone now. I can't say if just letting it sit would have caused the same shrinkage, but I'm suspicious of the washing process. I'll go to blow-off/shop vac/re-oil for regular condition inspections now, and a periodic replacement (3 years? 5? Depends on degradation or deformation) rather than washing.
set it out to dry (breezy sunny day after a gentle air blow off).
I bought a new filter at the first CI. I then cleaned the old filter and let dry as Scott suggests, in the hangar in free air. When dry, after a couple days, I put it back in the box until next year. I then oil the spare and install it (if it is new it is pre-oiled). At the next CI, repeat.
My two filters have lasted 750 hours total and more than ten years with no shrinkage..