Demon Carb identification help needed
#1688209
10/20/14 12:35 PM
10/20/14 12:35 PM
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Joined: Jan 2003
Posts: 4,105
Horsham, Pa.
Finoke
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OP
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Joined: Jan 2003
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Horsham, Pa.
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I got this Demon Carb with a parts lot that I picked up over the weekend. It doesn't have any identification numbers around the top air horn. Can anyone guide me on how to identify this carb and how to tell what SCF rating it is? Any input is appreciated 
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Re: Demon Carb identification help needed
[Re: cruzin]
#1688214
10/21/14 12:55 AM
10/21/14 12:55 AM
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Joined: Jan 2003
Posts: 4,105
Horsham, Pa.
Finoke
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Quote:
Down leg or annular booster?
I'm not sure what that means. I'm showing my carb ignorance 
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Re: Demon Carb identification help needed
[Re: rickraw]
#1688215
10/21/14 12:56 AM
10/21/14 12:56 AM
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Joined: Jan 2003
Posts: 4,105
Horsham, Pa.
Finoke
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Quote:
Measure the throttle bores & do a search.
Will do. So is throttle bore the main influence on the CFM rating?
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Re: Demon Carb identification help needed
[Re: Finoke]
#1688217
10/21/14 12:28 PM
10/21/14 12:28 PM
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Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate
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Mt. Eden Ky.
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It looks to be a Speed Demon With the butterflies showing 1.69 I figure that to be 1 11/16". I have the chart showing 1 11/16" vacuum sec. being either 650 or 750 CFm depending on venturi size. 650 is 1.28 and 750 is 1.40 venturi Boosters are downleg 650 is .140 750 is .160 I hope this helps. Mark
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Re: Demon Carb identification help needed
[Re: Hemi Allstate]
#1688218
10/21/14 03:59 PM
10/21/14 03:59 PM
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Joined: Jan 2003
Posts: 4,105
Horsham, Pa.
Finoke
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OP
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Horsham, Pa.
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Quote:
It looks to be a Speed Demon
With the butterflies showing 1.69 I figure that to be 1 11/16".
I have the chart showing 1 11/16" vacuum sec. being either 650 or 750 CFm depending on venturi size.
650 is 1.28 and 750 is 1.40 venturi
Boosters are downleg
650 is .140 750 is .160
I hope this helps.
Mark
So I found an identification chart on the Internet. A small number 6 is cast on the top of the carb meaning it's a 575 or 650 speed demon.
It's a 575 if the booster is annular. It's 650 if it's down leg. So it sounds like it's a 650.
What does each type of boost Venturi look like?
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Re: Demon Carb identification help needed
[Re: Finoke]
#1688219
10/21/14 04:27 PM
10/21/14 04:27 PM
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Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate
master
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master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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From what I can see of your above picture yours are down leg. Annular boosters are larger in diameter, and thicker, and that is why the reduced CFM rating when they are used. Mark
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Re: Demon Carb identification help needed
[Re: Hemi Allstate]
#1688220
10/21/14 04:52 PM
10/21/14 04:52 PM
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Joined: Jan 2003
Posts: 4,105
Horsham, Pa.
Finoke
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OP
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Joined: Jan 2003
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Horsham, Pa.
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Quote:
From what I can see of your above picture yours are down leg.
Annular boosters are larger in diameter, and thicker, and that is why the reduced CFM rating when they are used.
Mark
Nice, thx!
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Re: Demon Carb identification help needed
[Re: Finoke]
#1688221
10/21/14 04:57 PM
10/21/14 04:57 PM
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Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate
master
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master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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One more thing, I don't show the 575 CFM annular booster as a vacuum secondary carb either. Mark
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