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Custom Dual Carb Air Cleaner.


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As part of my dual carb conversion I needed air cleaners. I wanted to use velocity stacks too. With the limited space considering my non-tii brake booster this was a challenge. I found several air cleaners that would fit but that we're not large enough to allow the use of 40mm velocity stacks. I wanted my cake and to eat it too. Simple solution... Make my own.

40mm velocity stacks.. 2.5" wide air filters.

I made this out of an old sign. Thin gauge sheet metal. Work in progress. Much to my dismay it DOES contact the brake booster. I will MAKE it fit. ;)







It's hard to tell from the pics but the bottom has the same hole pattern as the cover. Each side also has a air inlet hole.

Trim the cover tabs. Bead blast. Powder coat. Almost done.

Edited by jdeitch

1975 Polaris 2002 (RAT 02E), 1962 mini Cooper S

1994 Land Cruiser - expedition vehicle, 2012 VW Touareg TDI.
2002 restoration blog - http://rato2e.blogspot.com/

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That is nice work.

Why is this arrangement better than the same filters with simple sandwich plates either side? The lid would still be the same distance from the ends of the ram pipes

rtheriaque wrote:

Carbs: They're necessary and barely controlled fuel leaks that sometimes match the air passing through them.

My build blog:http://www.bmw2002faq.com/blog/163-simeons-blog/

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What you'll find is that you'll need to retune for having that flat plate in front of the trumpets.


The DCOE is noticeably suceptable to mixture variation based on what's in front of the stack- like, up

to 2 diameters, at least.


When I got my race car from Mike, he'd fabbed up something like you have.  He'd tuned it for a 

(limited prep) setup, and it worked great.

However, when I opened up chokes, header, etc the carbs really didn't like his intake.

I played with a few that REALLY killed horsepower, and finally settled on something that

gave as much room between the trumpet mouth and the filter as possible, and let air come in 

'more or less' straight at the mouth.  


It's still not quite as good as no airbox at all, but it does the least harm I could manage and still get clean air in.



Edited by TobyB

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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best thing would be a big sealed airbox, tuned to the RPM you want peak torque at, with as little shrouding between the stacks and box as possible. Also it will allow you to take air from a cooler place. Open V-stacks (without any filter) make peak power, but a proper sealed box will give you the best overall powerband without very much top end loss. Also open V-stacks can be a pain to tune. Luckily engine bays are pretty closed off from airflow, but if you ever try tuning open stacks on a motorcycle, you will know the trouble that even a slight breeze across the carb mouth can cause. 

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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