Air Filter Question

J

Jay247

Active Member

Posts

194

Location

Scotland

• Aug 19, 2019

• #1

Just wondering do people leave the foam/cotton around the outside of the filter or do they remove it? What is it's exact purpose?

Just going to fit a new one soon and wondered if it was very restrictive and if I needed it at all.

Thanks

 

W

websun

Active Member

Posts

364

Location

Brakistan

• Aug 19, 2019

• #2

I personally don't think is restricting at all, seems quite fluffy. You will not gain any performance by removing it. Not 1hp

 

D

dog-man

Active Member

Posts

952

• Aug 19, 2019

• #3

I have tried both and saw / felt no difference in performance on my 2006 TD4.

 

J

Jay247

Active Member

Posts

194

Location

Scotland

• Aug 19, 2019

• #4

Ok thats quite interesting, I didn't know what the purpose of the foam/cotton whatever it is actually was.

 

W

websun

Active Member

Posts

364

Location

Brakistan

• Aug 19, 2019

• #5

Extra filtration I guess, although not much dirt gets there to be honest.

 

Nodge68

Well-Known Member

Posts

32,848

Location

Cornwall

• Aug 20, 2019

• #6

Jay247 said:

Just wondering do people leave the foam/cotton around the outside of the filter or do they remove it?

Click to expand...

I remove it myself.

Jay247 said:

What is it's exact purpose?

Click to expand...

It stops large amounts of sand from clogging the filter paper.

Jay247 said:

Just going to fit a new one soon and wondered if it was very restrictive and if I needed it at all.

Click to expand...

I did a vacuum flow test on a small sample, and it does cause a slight restriction.

 

Last edited: Aug 20, 2019

J

Jay247

Active Member

Posts

194

Location

Scotland

• Aug 20, 2019

• #7

Thank you appreciate the reply.