Cheap 'Pod' filters - why you shouldn't - Public service posting

[manas]

Way too much velocity to test with, IMO, so of course you're gonna get the same results with or without the stacks.

Really? My guess was that while you wouldn't have such a sustained period of suction, the rate of suction as well as the dynamic pressure would be greater through the Bernoulli's tube. I guess we could roughly calculate it if we knew the displacement and the average time the slide is open for. Actually never mind, I think all you would need is the time taken for the intake cycle and displacement.

[harrydahl]

By the way, sorry if I sounded heavy-handed in my initial reply. Wasn't my intention. Funny how writings don't always read like the writer's emotion.
[/quote

That's OK, sometimes it's not easy to understand, what the other fellar is trying to explain
This is how the velocity stacks look like now.

[harrydahl]

This is my "flow bench", made up from a vaccumcleaner, a beer can (Carlsberg, not my favorite..) and some masking tape...

[crazypj]

Cool, works for me 
David Vizard uses a shop vac for a DIY flowbench, it's in a couple of his tuning books
The electronics to go with it are about $700~1,000, need to be doing quite a few heads/carbs/filter checks to justify that outlay though (still way cheaper than a $5~10,000 dollar bench  )

[Rich Ard]

This is my "flow bench", made up from a vaccumcleaner, a beer can (Carlsberg, not my favorite..) and some masking tape...

It's good enough for who it's for ha ha! Good idea.

[harrydahl]

Just beware that the carbs are clean,you don't want gas fumes into the vacuum cleaner, might be a surprise.....

[crazypj]

Motors are sealed on new ones, Mythbusters did a bunch of tests (I wouldn't deliberately suck gas through vacuum though)

[harrydahl]

Well, what do you know....You learn something every day! Unnecessary knowledge: the vacuumcleaner is an Electrolux, who owned Husqvarna motorcycles ("Husky") for a brief time, but then sold it to some Spanish or Italian company. I believe the brand is now owned by BMW.

[kopcicle]

Yep, the slides are a fair way up when fully seated.
If you open throttle gradually you can get a pretty high rpm before they lift
When you blip throttle they flutter

Teaz I can confirm this

~kop

[Bobby Joe]

Wow...putting this on my list to check.  Good find.  I would almost be more worried about the filter properties over the rubber boot.