Air filters: types and opinions

[redhot]

Some questions: my filters hit the side of the fanhousing. OEM 1600 fanhouse, 36 DRLA carbs and standard manifolds. Also, I`m not to convinced that mye current Chrome EMPI filters do any good to my engine.

Therefore I`m curious about the mesaurements on the CB filters.

See pics below:

1) My current (EMPI chrome cheap) filters
2) CB filters
3) ITG megaflow (JC 20 /65)

[super vw]

The foam filters are the best. We use product from a company called True-Flow that has some very nice foam filters for many applications (exept webers like we run) but the ITG an other brand of racing foam filters are better than the paper gauze filters (like K&N..ect).
The foam (with good sticky oil) will trap more dirt, cinders and stuff than the gauze filters, and they flow very nice aswell (usually better).

Most race cars are running no filters, or foam filters... like the ITG's

Im running gauze filters at the moment till some ITG's show up, i first need to figure out how im going to run my breather lines from my breather box. as with ITG's you dont have a solid mounting surface for a bulkhead ftting.

[beetle1303]

Actually K&N has filters for us (weber idf etc) out of fabric (like the thing you put on scars and wrap around)and they are redish in colour (K&N's panel filters are both paper element and the gauge element). They are cleanable and require a "special" oil to be sparyed onto them to work properly. The main reason i sticked with the K&Ns is that i park my car outside by the road in the open, so when it rains the chance of water passing through the airfilters is slim to none since they have the plate on top to hold them. I would really like to try the ITGs though...

Chris

[redhot]

Any more opinions?

This should be a area of interest since our engines need clean air. And Dellortos really would appreciate it.

[super vw]

Unfortunatly there is not a whole lot of options for our carbs.
You could also looking into a central mounted airbox with a simple flat filter.

Custon & Speed parts has them (CSP). the advantage to those is they keep the sound down. they are expensive relative to others... but look neat!

Jonathan

[redhot]

Originally Posted by super vw

Unfortunatly there is not a whole lot of options for our carbs.
You could also looking into a central mounted airbox with a simple flat filter.

Custon & Speed parts has them (CSP). the advantage to those is they keep the sound down. they are expensive relative to others... but look neat!

Jonathan

Love the central airbox, but the cost... Pretty sure i`s a nice item, but you could do a top end rebuild for those money.


Anyone got the mesaurements on the CB filter bases?

[andy1303]

I had exactly the same questions a while ago, and ended up with k&n's which are a very similar size to your current air filters. I do believe the CB performance ones are also about that size. However when running solid top filters you do need the clearance above the velocity stacks if you have them.

Andy

[Wally]

When I had space restrictions (left carb filter to fire-wall) in my 412, I used a foam type filter brand Pipercross. They fit snug over the velocitystacks. Works fine.

[redhot]

Wally:


These do noy use any baseplate, and only locates over the velocity stacks?

Looks like this is going to be the best choice for me.


ps: there are many diameters of velocity stacks? Do you know what combination of filter/stacks you had?

[Wally]

yep, no base plates; the foam is very strong, yet very plyable (sp?) so it will just stretch over most any width opening of stacks. They are mostly used by guys using EFI with DCOE stacks, but they will fit most everything and if not, you just carve them up a bit wider with a scissor
My stacks are 40mm high btw and I made two small extra holes (yes, with the scissors) for the tops on the emulsion tubes with the air correction jets.

Good luck,
Walter

[redhot]

Noone that can mesaure the CB`s for me?

Also: wondering about making my own central airbox system. Looking at the price of the CSP one, I shoul be able to use some hours

Using the old arfilters or turbo air boxes as a frame for the carb-houses, and an old 1600 central housing for central frame and then only some ducting would be needed.

All would be made in fiberglass

But: how much would this affect airflow? Would this impose restrictions on this?


And Wally: guess the 411 dont have problem of water coming into the carbs? That is one of the reasons I would love a central box/CB filters and not just foam.

[Wally]

Originally Posted by redhot

And Wally: guess the 411 dont have problem of water coming into the carbs? That is one of the reasons I would love a central box/CB filters and not just foam.

No, no problems with water.