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Project Airfilter 1/3


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#1 js69

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Posted 17 September 2017 - 09:18 PM

Hi, I have a converted CJ with a BMW R100 engine but it has an original airfilter.
The airfilter and the connections to the carbs are not right for this engine and I have created my own filterbox for it.
The number of pictures are limited to 6, so I'm posting in three parts.

Here is the original airfilter Setup of my bike:
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This is my new airfilterbox:

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This is the new airfilterbox replaceing the original one:

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Jürgen

#2 js69

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Posted 17 September 2017 - 09:19 PM

Project Airfilter 2/3

The making of the airfilterbox:

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#3 js69

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Posted 17 September 2017 - 09:21 PM

Project Airfilter 3/3

More making-of pictures:

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Installed the connections to the carbs:

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#4 Russ Noe

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Posted 18 September 2017 - 09:09 AM

Nice fabrication, and good welding.
Thanks for sharing.
~RN

#5 js69

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Posted 18 September 2017 - 05:59 PM

Thanks!
Forgot to add: I used a K&N RU-0620, 3.5" x 6". The tubes are 2 1/4".

#6 Vance Blosser

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Posted 18 September 2017 - 06:13 PM

Very well done!

#7 js69

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Posted 25 September 2017 - 09:48 PM

The air filter provided too much air and the mix was too lean.
To solve this problem, I made version 2.0 with an adjustable air flow.

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Used stainless steel 304 for the tubes:

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Changed the filter from 6" length to 5" length (K&N Filter RD-0610) to cover for the air adjustment lever.

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I hope it is useful for someone!
Thx!

#8 Scrapple

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Posted 29 September 2017 - 09:37 AM

Wow, you are a true craftsman, with some  great tools at your disposal.  Thanks for posting.

#9 js69

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Posted 29 September 2017 - 05:11 PM

Thanks Scrapple, you only need a lathe and a welder for this. The level for example is made from the part that was cut out of the tube. Two small stripes were welded on each other to form the base. Another larger stripe from the tube was welded on this base to make the lever. Everything else was done with a metal file, sanding paper and some polish. Actually, this thing took most of the time to make.
The cutouts for the tube could be easily done with a hacksaw.

#10 Sputternik

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Posted 08 October 2017 - 01:26 PM

Very cool build - mad skills.

Thanks for sharing.




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