measuring air filter restriction

[jnsnwt]

This was posted to the Jag-Lovers site. I thought you folks would be interested so I am passing it along.

John and Sue in West Texas


>Dead Link Removed

>This guy uses a manometer to measure relative >restriction that different air
>filters provide in a BMW E30 air box.
>Pretty interesting & surprising results.

>K&N didn't do as well as you would think....

 

[Brian1]

thanks for the link. That was interesting. I am suprised that the fram did well compared to the K&N

 

[zensius]

Somebody had a link a while back that compared the particulate catching ability of various filters. Surprisingly the K&N did worse than the Fram on that test too.

 

[hrbib21]

Yes, I've also seen tests showing the amount of silicate (sand) that certain filters allowed into your engine. K&N was just about at the top of the list (bad).

 

[dogfriend]

Originally posted by hrbib21
Yes, I've also seen tests showing the amount of silicate (sand) that certain filters allowed into your engine. K&N was just about at the top of the list (bad).

Do you have a link to this? I would like to see it if its on the web.

 

[RFR2212]

This doesn't seem to surprise me...

 

[FrankRizzo]

Originally posted by zensius
Somebody had a link a while back that compared the particulate catching ability of various filters. Surprisingly the K&N did worse than the Fram on that test too.

That'd be me.....

 

[rvitek]

Here's the one I posted awhile back - with dyno results.

http://caddyinfo.netgetgoing.com/dyno/4airboxtest.htm

 

[FrankRizzo]

Dead Link Removed

 

[Bill Kemp]

Heres a little K & N info...http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=15;t=000025
IMO if we are talking about microns of dirt the oil in the engine isnt going to let particles that small come into contact with moving parts.
I'm sticking w/K&N cause I clean it once a year & its paid for.

 

[dogfriend]

Thanks for posting these links guys. Its interesting about K&N filters. I have also seen some threads over on the oil board that indicate that some of the members think that the K&N filters let in more dirt.

Ive used them on my Ranger and on the Explorer, and they seem to work ok, but I have never had an oil analysis done.

 

[Opera House]

Here is how it is done

In case some of you are unfamiliar with a manometer. First drill a hole in the plastic air duct between the flow meter and the valve body. Easiest tap device to use is a rubber tire valve stem with the Schrader valve removed. Pull the tire valve through the hole till it snaps in. You can use the rubber cap to seal it off afterwards. Slide a 6 foot length of clear plastic tubing over the threads of the valve. At the other end, Fold over the tube and attach it to a stick with ty-wraps. Folded over length should be 24 inches long with the bend on the bottom and a hook attached to the stick on top for attaching it to the open hood. It should hang vertically and might work better if some weights were on the bottom to keep it verticle. Fill with 5 inches of colored water. Then with the engine unning you measure the difference between the upper and lower tube levels with a caliper. Inches of water is a standard measuring unit.