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Demon Carburetors? Good or Bad? UPDATE! I LIKE IT!
- Thread starter RingMaster4x4
- Start date
Tweetysuarus
1/2 ton status
Re: Demon Carburetors? Good or Bad?
For that price get a Q-Jet or a Truck Avenger. JMO!
Bill
For that price get a Q-Jet or a Truck Avenger. JMO!
Bill
slimlynn1
1/2 ton status
Re: Demon Carburetors? Good or Bad?
I've got the Speed Demon 750 with mechanical secondaries on my blazer. Very nice carb.
I've got the Speed Demon 750 with mechanical secondaries on my blazer. Very nice carb.
Re: Demon Carburetors? Good or Bad?
The best carb for the money...
I had one on my hot rod...I LOVED IT....
HOT ROD 87C1500 468 FULL ROLLER DEMON 850 31X18.5 SPORTSMEN PRO...10.30 1/4
ALL HAIL THE ALMIGHTY SAWZALL
The best carb for the money...
I had one on my hot rod...I LOVED IT....
HOT ROD 87C1500 468 FULL ROLLER DEMON 850 31X18.5 SPORTSMEN PRO...10.30 1/4
ALL HAIL THE ALMIGHTY SAWZALL
RingMaster4x4
1/2 ton status
Re: Demon Carburetors? Good or Bad?
Now that is what I want to hear. Anyone else? /forums/images/graemlins/ears.gif
Now that is what I want to hear. Anyone else? /forums/images/graemlins/ears.gif
RingMaster4x4
1/2 ton status
Re: Demon Carburetors? Good or Bad?
[ QUOTE ]
The best carb for the money...
I had one on my hot rod...I LOVED IT....
HOT ROD 87C1500 468 FULL ROLLER DEMON 850 31X18.5 SPORTSMEN PRO...10.30 1/4
ALL HAIL THE ALMIGHTY SAWZALL
[/ QUOTE ]
cool! /forums/images/graemlins/bow.gif /forums/images/graemlins/peace.gif
[ QUOTE ]
The best carb for the money...
I had one on my hot rod...I LOVED IT....
HOT ROD 87C1500 468 FULL ROLLER DEMON 850 31X18.5 SPORTSMEN PRO...10.30 1/4
ALL HAIL THE ALMIGHTY SAWZALL
[/ QUOTE ]
cool! /forums/images/graemlins/bow.gif /forums/images/graemlins/peace.gif
Z3PR
Banned
RingMaster4x4
1/2 ton status
Re: Demon Carburetors? Good or Bad?
[ QUOTE ]
[ QUOTE ]
The best carb for the money...
I had one on my hot rod...I LOVED IT....
HOT ROD 87C1500 468 FULL ROLLER DEMON 850 31X18.5 SPORTSMEN PRO...10.30 1/4
ALL HAIL THE ALMIGHTY SAWZALL
[/ QUOTE ]What about this one for a 400 cid sbc. ???
[/ QUOTE ]
who are you talking to paul?
[ QUOTE ]
[ QUOTE ]
The best carb for the money...
I had one on my hot rod...I LOVED IT....
HOT ROD 87C1500 468 FULL ROLLER DEMON 850 31X18.5 SPORTSMEN PRO...10.30 1/4
ALL HAIL THE ALMIGHTY SAWZALL
[/ QUOTE ]What about this one for a 400 cid sbc. ???
[/ QUOTE ]
who are you talking to paul?
Z3PR
Banned
Re: Demon Carburetors? Good or Bad?
Anyone and everyone who would like to answer. I'm not too picky, ya'know.
Anyone and everyone who would like to answer. I'm not too picky, ya'know.
RingMaster4x4
1/2 ton status
Re: Demon Carburetors? Good or Bad?
oh I get it now I read it wrong. sorry. that looks like that would be a good for a sb 400, but hey what do I know I am the one that started this post. /forums/images/graemlins/rotfl.gif
oh I get it now I read it wrong. sorry. that looks like that would be a good for a sb 400, but hey what do I know I am the one that started this post. /forums/images/graemlins/rotfl.gif
Z3PR
Banned
Re: Demon Carburetors? Good or Bad?
I hear ya. I'm not the most knoligable when it comes to cfm. I ran a 600cfm Holley on the hot rod with a built 383 stroker, but not sure on the needs of a mostly stock 400. I would think 625cfm would be close.
I hear ya. I'm not the most knoligable when it comes to cfm. I ran a 600cfm Holley on the hot rod with a built 383 stroker, but not sure on the needs of a mostly stock 400. I would think 625cfm would be close.
RingMaster4x4
1/2 ton status
Re: Demon Carburetors? Good or Bad?
Here is some stuff that I found on holley website that might help you.
How To Calculate CFM:
Engine size (CID) x maximum RPM / 3456 = CFM
CFM @ 100% volumetric efficiency
(Example: 350 CID x 6000 RPM = 2,100,000 / 3456 = 608 CFM)
Approximately 608 CFM would be required for this engine. However, most Street engines are capable of achieving only about 80% VE; a modified street engine with ported heads, headers, intake and carburetor can achieve about 85% VE; a fully modified race engine can achieve 95% or greater VE. The CFM number arrived at with this formula must be factored by this percentage.
Next, you need to decide whether a vacuum secondary or a mechanical secondary carburetor will work best for you.
As a rule of thumb, vacuum secondary carburetors work best on:
Relatively heavy vehicles
Street gearing
Automatic transmission
Engines built more for low-end torque
Conversely, mechanical secondary carburetors seem to work best on:
Relatively light vehicles
Strip gearing (4.11 or numerically higher)
Manual transmission
Engines built more for top-end horsepower
Here is some stuff that I found on holley website that might help you.
How To Calculate CFM:
Engine size (CID) x maximum RPM / 3456 = CFM
CFM @ 100% volumetric efficiency
(Example: 350 CID x 6000 RPM = 2,100,000 / 3456 = 608 CFM)
Approximately 608 CFM would be required for this engine. However, most Street engines are capable of achieving only about 80% VE; a modified street engine with ported heads, headers, intake and carburetor can achieve about 85% VE; a fully modified race engine can achieve 95% or greater VE. The CFM number arrived at with this formula must be factored by this percentage.
Next, you need to decide whether a vacuum secondary or a mechanical secondary carburetor will work best for you.
As a rule of thumb, vacuum secondary carburetors work best on:
Relatively heavy vehicles
Street gearing
Automatic transmission
Engines built more for low-end torque
Conversely, mechanical secondary carburetors seem to work best on:
Relatively light vehicles
Strip gearing (4.11 or numerically higher)
Manual transmission
Engines built more for top-end horsepower
crazy427
1/2 ton status
Re: Demon Carburetors? Good or Bad?
I Run an 825 race demon on my chevelle--427 talldeck, weiand 177, 7004r and 4-56s it does 11.3 @ 128mph. We run 2 650 demons on my fathers 57 chevy---355, 8-71 weaind , m22 and 3-55s.I modified and boost refrenced the carbs on both of those. Everyother car or truck we build that is not fuel injected gets a demon. /forums/images/graemlins/usaflag.gif /forums/images/graemlins/peace.gif /forums/images/graemlins/thumb.gif
I Run an 825 race demon on my chevelle--427 talldeck, weiand 177, 7004r and 4-56s it does 11.3 @ 128mph. We run 2 650 demons on my fathers 57 chevy---355, 8-71 weaind , m22 and 3-55s.I modified and boost refrenced the carbs on both of those. Everyother car or truck we build that is not fuel injected gets a demon. /forums/images/graemlins/usaflag.gif /forums/images/graemlins/peace.gif /forums/images/graemlins/thumb.gif
RingMaster4x4
1/2 ton status
Re: Demon Carburetors? Good or Bad?
Sounds good. I think that I might try one. what year chevelle did you have the 427 tall deck in? was there problems fitting it in there?
Sounds good. I think that I might try one. what year chevelle did you have the 427 tall deck in? was there problems fitting it in there?
crazy427
1/2 ton status
Re: Demon Carburetors? Good or Bad?
It is in a 70 /forums/images/graemlins/peace.gif /forums/images/graemlins/bow.gif. Nope no problems ,drop right in. /forums/images/graemlins/usaflag.gif
It is in a 70 /forums/images/graemlins/peace.gif /forums/images/graemlins/bow.gif. Nope no problems ,drop right in. /forums/images/graemlins/usaflag.gif
RingMaster4x4
1/2 ton status
Re: Demon Carburetors? Good or Bad?
well I have it installed (Thursday night) and I made a 300 mile round trip with it yesterday and it ran great. This carb is so simple that event I can tune it. It came with a nice Tuning video and every thing worked great. /forums/images/graemlins/thumb.gif
well I have it installed (Thursday night) and I made a 300 mile round trip with it yesterday and it ran great. This carb is so simple that event I can tune it. It came with a nice Tuning video and every thing worked great. /forums/images/graemlins/thumb.gif
