CARBS , cfm rating on DUAL 34mm, Solex and Dell 'ortos

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Beezerbob
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Joined: Fri Oct 12, 2007 8:55 pm

CARBS , cfm rating on DUAL 34mm, Solex and Dell 'ortos

Post by Beezerbob » Sat Nov 28, 2009 3:13 pm

Is there a chart ? to compare CFM in vw carbs that are always rated in mm? :D :oops:
I am Looking at dual 34mm Solex and 34mm Dell'Ortos, that are 4 sale on the web .
Last edited by Beezerbob on Fri Dec 04, 2009 8:04 am, edited 1 time in total.

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perrib
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Re: CARBS , cfm rating on 34mm, 40mm, !!??

Post by perrib » Sat Nov 28, 2009 7:52 pm

Don't know. Here are some figures I found in the past.
Source:
CB Performance 1991 catalog- no flow specs or venturi sizes
I assume these numbers are @28" H2O per venturi

Dell'Orto 48mm DRLA 388.5cfm
Weber 48mm IDA 372.1cfm
Dell'Orto 45mm DRLA 329.3cfm
Weber 44mm IDF 292.3cfm
Dell'Orto 40mm DRLA 266.4cfm
Weber 40mm IDF 212.8cfm
Dell'Orto 36mm 205.8cfm
Low Bugget
Stock 40 mm Kadron with 28mm vent and stock air cleaner bracket.
165cfm @25"

Post by FWVWG here on Shop Talk Forums:

34 PICT w/ no mods & choke plate held fully open (as on all tests): 114.9CFM at 25"
Throttle shaft thinned, polished around venturi top & base & increased venturi radius, thinned both sides of choke plate shaft, smooth out casting of upper carb top edge, blend base of carb top to match carb base, thinning accelerator pump nozzle area & float bowl vent, etc, etc: 129 at 25".

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Beezerbob
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Joined: Fri Oct 12, 2007 8:55 pm

Re: CARBS , cfm rating on 34mm, 40mm, !!??

Post by Beezerbob » Sun Nov 29, 2009 8:49 pm

Great Info!! :P ANYONE know cfm for dual 34 solex? and 34mm dual dell ortos!? :P

GARRICK.CLARK1
Posts: 270
Joined: Sun Dec 16, 2018 10:30 am

Re: CARBS , cfm rating on DUAL 34mm, Solex and Dell 'ortos

Post by GARRICK.CLARK1 » Thu Aug 22, 2019 9:49 am

Just bringing this back from years ago. It shows the 40 dells I'm using at 266 cfm. 48 dells at 388 cfm. Maybe 48's are the future for me. Bit pricey tho

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