19 replies to this topic

[1314cc]

I know the quality of kn but just wondered if anyone has used the cheap copy kn cone air filters. Im guessing they dont flow as well? Or maybe no difference?

[nicklouse]

Cone filters are not good at all.

[Retroman]

Nick is correct

 

There are so many cheap nasty cone filters nobody will have any flow figures for them...and how well do they filter...? The guys making them have no idea and will have done no testing, they just want to sell them.

 

Cones partly cover the mouth of the carb and don't work that well from a flow point, you are better off with a standard air filter box an elbow and a few holes in the back of the box...Keith Calver proved it.

[panky]

They are noisy too. I fitted one to one of my Commer campers as it was the easiest thing to fit when I did an SU conversion to it, it's the loudest thing in the cab and that's no mean feat on an old Commer

On the Mini I've found the standard air box with a K&N element to be absolutely fine compared with the K&N cone, a lot quieter and no noticeable drop in performance. Did the airbox drilled thing too, I found it just increased the noise a bit.

[Midas Mk1]

Buy cheap buy twice, med itg kit is the way forward

[unburntfuelinthemorning]

It's easy to make an air filter flow air and easy to make one filter air.  Making one that does both well is the trick and why good ones will cost more.

[Spider]

I found fitting a bell mouth in the Cone Filters helps. It doesn't 'fix' them, but is a move towards restoring what they take away.

[Tupers]

First off cheap air filters are a false economy. They either done filter prompt and knacker your engine or restrict flow too much and lose you power.


A cone filter with a stub stack/small trumpet will flow nicely but can be quite loud but that’s personal preference.

[1314cc]

I did read an article by Keith calver and how he found a drilled airbox with kn produced some of the best results

[Maccmike8]

Aftermarket filters such as K+N restrict airflow due to increased filtration to protect tuned engines.

An article somewhere out there tests oe vs aftermarket panel filters proving such.

To get around it you fit oversized filters with greater surface area, such as cone filters.

[Tones61]

https://www.calverst...air-filtration/

[Minigman]

I’m curious what you chaps recommend for twin HS4 carbs. I have them on a 1330cc mk3 fitted with K&N cones with stub stacks and the noise does get to me after a while (maybe my old age!) Please don’t say a HIF44, as good as they are, I wouldn’t fit one on a mk3.

[nicklouse]

I’m curious what you chaps recommend for twin HS4 carbs. I have them on a 1330cc mk3 fitted with K&N cones with stub stacks and the noise does get to me after a while (maybe my old age!) Please don’t say a HIF44, as good as they are, I wouldn’t fit one on a mk3.

The old housing modified and a couple of KN elements or one if that’s what they do.

[Minigman]

I’m curious what you chaps recommend for twin HS4 carbs. I have them on a 1330cc mk3 fitted with K&N cones with stub stacks and the noise does get to me after a while (maybe my old age!) Please don’t say a HIF44, as good as they are, I wouldn’t fit one on a mk3.

The old housing modified and a couple of KN elements or one if that’s what they do.

You mean a modified 1 1/4” twin airbox?

[Turbo Phil]

From The little bit of flowbench testing I did the K+N cone filter offered virtually no restriction to airflow at all. The same can’t be said about the other “filter” I tested alongside it.
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Phil.