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I have installed a 38/38 weber and want to adapt a larger BMW air filter picked up at the Vintage.  Does anyone know where I can find the support brackets show in the picture?

 

Thanks!

 

post-43365-0-70158300-1432519198_thumb.j

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I know I don't run those brackets on my 38 and it works fine. I also cut the bottom of my air filter up to make it work... Good luck!

-Nathan
'76 2002 in Malaga (110k Original, 2nd Owner, sat for 20 years and now a toy)
'86 Chevy K20 (6.2 Turbo Diesel build) & '46 Chevy 2 Ton Dump Truck
'74 Suzuki TS185, '68 BSA A65 Lightning (garage find), '74 BMW R90S US Spec #2

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I would definitely use the brackets to support that air cleaner.  You really don't want all that weight resting on the carb; the factory put those brackets there for a reason.  

 

Adapting the factory air cleaner to a Weber is a pretty easy job with tinsnips and a Dremel.  I have found that the cast aluminum adapter sold for the purpose causes the air cleaner to hit the underside of the hood, so I just cut the lip off the bottom of the air cleaner and enlarged the opening so it matched the Weber's.  Finally I made a gasket from some closed-cell foam the fill the space between carb and air cleaner.  Been working fine since about 1981, when I first installed the Weber.  

 

cheers

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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I would definitely use the brackets to support that air cleaner.  You really don't want all that weight resting on the carb; the factory put those brackets there for a reason.  

 

Adapting the factory air cleaner to a Weber is a pretty easy job with tinsnips and a Dremel.  I have found that the cast aluminum adapter sold for the purpose causes the air cleaner to hit the underside of the hood, so I just cut the lip off the bottom of the air cleaner and enlarged the opening so it matched the Weber's.  Finally I made a gasket from some closed-cell foam the fill the space between carb and air cleaner.  Been working fine since about 1981, when I first installed the Weber.  

 

cheers

mike

I hate to disagree with you Mike, but the carb doesnt care if a couple pounds are on top of it, the factory put the brackets there because as you probably know the air cleaner just slipped onto the solex. Therefore they needed something to bolt the air cleaner down with, this was those brackets.

 

But truly in the end it's really comes down to what each owner wants and what ever works. I like the closed cell foam thing though, I need to do that to my air cleaner! It's just a bad paper gasket right now...

-Nathan
'76 2002 in Malaga (110k Original, 2nd Owner, sat for 20 years and now a toy)
'86 Chevy K20 (6.2 Turbo Diesel build) & '46 Chevy 2 Ton Dump Truck
'74 Suzuki TS185, '68 BSA A65 Lightning (garage find), '74 BMW R90S US Spec #2

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Steel air cleaner resting on a pot metal carb...guess which will wear first?  Without the brackets, there's nothing to hold the air cleaner in place if you don't use the adapter--and it's been my experience (and others) that the bracket sits the air cleaner too high so that it hits the hood.  

 

Also, if you look closely, the original opening that fits to the Solex carb is smaller than the Weber's intake throats, so you're losing a bit of air flow into the carb if you don't open out the oval Solex opening so that it matches the rectangular Weber opening.

 

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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  • 4 weeks later...

Thanks all for the response. Based my experience with sheet metal and vibration I would expect eventual stress cracks.

I will key my eyes open for the oem brackets.

I won't get to this until I tackle the nose replacement so I have time to look!

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Also, if you look closely, the original opening that fits to the Solex carb is smaller than the Weber's intake throats, so you're losing a bit of air flow into the carb if you don't open out the oval Solex opening so that it matches the rectangular Weber opening.

 

mike

 

Mike-

 

I don't know these kind of 32/36/38 webers, only the two-barrel carb used here only on automatics 73-. So I don't know about the opening's size. But these ones have a kind of L-profile (# 10) between the airbox and the carb. Wouldn't this fit to an 32/... airbox?

 

post-42081-0-38032100-1434736201_thumb.p

 

And as far as I have understood, all 73-US models came with two barrels- correct? So why not use one of these ones?

But however: yes, without brackets it's not complete.

Hen

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Adapting the factory air cleaner to a Weber is a pretty easy job with tinsnips and a Dremel.  I have found that the cast aluminum adapter sold for the purpose causes the air cleaner to hit the underside of the hood, so I just cut the lip off the bottom of the air cleaner and enlarged the opening so it matched the Weber's.  Finally I made a gasket from some closed-cell foam the fill the space between carb and air cleaner.  Been working fine since about 1981, when I first installed the Weber.  

 

Hi Mike,

 

Where did you get the closed-cell foam? I installed a 32/36 last year and wouldn't mind going back to my stock air cleaner.  I want to make sure the stuff I get will withstand the heat and not melt. Or is a gasket not really necessary? thanks!

 

Mike

Edited by thinksound_mike

mike tunney

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Hen,

All U.S. non-tii's received the dual-barrel Solex beginning sometime in the '71 model year. The Weber airhorn is simply larger, and a different shape than, the Solex's airhorn. So part #10 will not fit AND you must enlarge the hole in the bottom section of the airbox, which is why Mike improvises a "replacement #10" with closed-cell foam.

Regards,

Steve

Edited by Conserv

1976 2002 Polaris, 2742541 (original owner)

1973 2002tii Inka, 2762757 (not-the-original owner)

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