air horns and airfilters on 40 dcoe

[vintage_car]

On my weber 40 dcoe sidedrafts there aren't any air horns and I have the K&N filters. I want different filters and think I should have airhorns for better airflow. What are suggestions? I like the large singlt itg filter, and also the ones that are the chrome wire mesh, both are appealing, but wanted to get input with airhorns and where to get those from and specific lengths. I know they can't be to long b/c of the brake booster.

[visionaut]

There's a version of the taller K&N filter set-up that allows you to run straight airhorns (aka velocity stacks) inside them. I've everything from very short - just the horn radius - to approx 75mm versions run in set-ups like that.

Another alternative is a 90-degree airhorn/airfilter adapter, which you can use to get a longer length and also fit various filters without brake booster interference. See attached pic for some samples of the latter - the 1st two being Alpina models (from their dual DCOE configs), and the latter another aftermarket model (NLA). Most of these are now un-obtanium tho'.

[Jon_uk]

Ok, so this is off the topic of your thread but were you the fella how made the cover for the front of your engine out of aluminium? I was wondering if ou had any pictures of the final piece and, slightly cheekily, if you had a pattern... I'd love to make one for mine! The car is in the body shop at the moment so I'm looking for little projects I can keep myself busy with!

Thanks in advance

Jon

[vintage_car]

what are your thoughts on the horns inside the K&N filters? do you happen to have a link for the horns?

Off Topic Post:

Yes I have a template, but will be modifiying it this winter for a project I'm working on for the forum store...stay tuned.

[Jon_uk]

Cool, I have just been skimming through your previous posts and it leaves me in no doubt that whatever you make will be great! Jon

[visionaut]

what are your thoughts on the horns inside the K&N filters? do you happen to have a link for the horns?

I think if the fliter is tall enough to provide good clearance past the top of the airhorn being used inside it, to not restrict or alter the airhorns airflow, they work well. (for units like the K&N with a 'hardtop'). This might not be such an issue with foam-top filters (like the ITGs or Pipercross style). Obviously the tallest filters would provide the ability to run the longest stacks (longer stacks aids midrange, shorter stacks aid top-end) - but too tall and you have your brake booster clearance problem.

Here's a couple links that might be useful:

http://piercemanifolds.com/airfilters.htm

http://www.redlineweber.com/html/application_guide/air_filter_applications_by_carbu.htm

http://www.knfilters.com/Racing/customcarb.htm

http://www.truechoice.com/prodinfo.asp?number=PIP%20C1153

http://www.truechoice.com/prodinfo.asp?number=PIP%20W4030R

I'm using a pair of the Alpina-knockoff 90deg airhorns with Lynx Ramflo airfilters with my dual sidedrafts nowadays. I used to run the 3.5" K&Ns with 30mm internal stacks, but booster clearance was tight.

[vintage_car]

what are your thoughts on the horns inside the K&N filters? do you happen to have a link for the horns?

I think if the fliter is tall enough to provide good clearance past the top of the airhorn being used inside it, to not restrict or alter the airhorns airflow, they work well. (for units like the K&N with a 'hardtop'). This might not be such an issue with foam-top filters (like the ITGs or Pipercross style). Obviously the tallest filters would provide the ability to run the longest stacks (longer stacks aids midrange, shorter stacks aid top-end) - but too tall and you have your brake booster clearance problem.

Here's a couple links that might be useful:

http://piercemanifolds.com/airfilters.htm

http://www.redlineweber.com/html/application_guide/air_filter_applications_by_carbu.htm

http://www.knfilters.com/Racing/customcarb.htm

http://www.truechoice.com/prodinfo.asp?number=PIP%20C1153

http://www.truechoice.com/prodinfo.asp?number=PIP%20W4030R

I'm using a pair of the Alpina-knockoff 90deg airhorns with Lynx Ramflo airfilters with my dual sidedrafts nowadays. I used to run the 3.5" K&Ns with 30mm internal stacks, but booster clearance was tight.

How well do the sock filters stay on the airhorns?