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-   -   Demon Carb (http://www.hotrodders.com/forum/demon-carb-227082.html)

77pontolds 12-11-2012 08:43 PM

Demon Carb
 
Does anyone have experience with a Demon carb? I am now using an AFB (really, not an edelbrock) and wonder if I can gain anything by going to a similiar CFM Demon. The design with the blended and smooth bores seems like it would in itself make more HP. I have shied away from Holleys due to leakage, but it looks like these other folks have solved that problem. I have always liked the fact that one can change jets and metering rods on an AFB type without loosing fuel and removing the carb. Thanks, Uncle Rich

vinniekq2 12-11-2012 08:45 PM

I bought an 830 demon for my 434,used it a year,gave it away.

Motochris 12-13-2012 03:40 PM

Are you referring to the new "Street Demon" 625 carb? That's the only Demon that uses metering rods. The rest are much like a Holley.

Here's a quick review I did on the 625-- http://www.hotrodders.com/forum/new-...rb-223299.html

lmsport 12-13-2012 03:50 PM

The Edelbrock/AFB/AVS carbs are somewhat more daily driver friendly than a Holley-type carb. A QJet really is the best daily driver carb but finding a suitable one and then tuning to the particular engine can be a chore even if you are familiar with them. A Holley-type will almost always make the most power for the least effort and are so simple anyone can get one close to optimum.

malc 12-13-2012 04:10 PM

I think my 750 Speed Demon is great, no problems......
except when I installed the wrong body to baseplate gasket.....:pain:

gearheadslife 12-13-2012 05:28 PM

Quote:

Originally Posted by malc (Post 1622410)
I think my 750 Speed Demon is great, no problems......
except when I installed the wrong body to baseplate gasket.....:pain:

same here.. no problems..
with my demon or bearclaw

632Mantis 12-13-2012 05:39 PM

I have an 850 Mighty Demon on my big block engine. I bought it back in 2005 I think.

Things I had to do to it:

Send the metering blocks back for exchange because the idle screw holes were drilled improperly. ( they were offset, they didn't line-up which caused the idle adjuster needles to break when you screwed them all the way in )
Change the power valve.
Change the jetting. ( It was ridiculously pig-rich. Came with 86pri and 94sec jets. )
Add notched float and jet extenders on the secondary side.

After all that.... it works great now!

lol

ap72 12-13-2012 07:01 PM

Quote:

Originally Posted by Motochris (Post 1622402)
Are you referring to the new "Street Demon" 625 carb? That's the only Demon that uses metering rods. The rest are much like a Holley.

Here's a quick review I did on the 625-- http://www.hotrodders.com/forum/new-...rb-223299.html

I have not used one of these but if I had to buy a new carb for a mild street car this one would be it. I also love the edelbrock 1406's I've used but this Demon seems to have a more refined design.

I've used holley's too and while they have a LOT more aftermarket support and options they really don't preform as well on a MILD STREET engine. A race engine is a different story.

I never saw the appeal of a quadrajet.

gearheadslife 12-13-2012 07:43 PM

Quote:

Originally Posted by ap72 (Post 1622504)
.

I never saw the appeal of a quadrajet.

really.. this carb will stay closer to a correct a/f than any other

ap72 12-13-2012 08:20 PM

Quote:

Originally Posted by gearheadslife (Post 1622530)
really.. this carb will stay closer to a correct a/f than any other

no, not really. You can tune any carb to get close to the desired AF ratio you want, and a BOX STOCK 1406 is pretty damn close on most mild 350's- for a cheap carb that is.

77pontolds 12-13-2012 08:43 PM

Demon carb
 
Actually, I was looking at a Speed Demon 650 cfm electric choke. I was hoping to improve the performance of my 400 Pontiac over what the AFB provides.

vinniekq2 12-13-2012 09:08 PM

I doubt that there would much if any HP improvement.

WDCreech 12-13-2012 09:09 PM

I, like gearheadslife, think that the Quadrajet is the best street carb ever built. Because it has an air valve controlled secondary, you can't be over carburated. Once you get it tuned, it will do an excellent job!

Bill

http://i299.photobucket.com/albums/m...h/P9070061.jpg

ap72 12-13-2012 09:50 PM

Quote:

Originally Posted by WDCreech (Post 1622576)
I, like gearheadslife, think that the Quadrajet is the best street carb ever built. Because it has an air valve controlled secondary, you can't be over carburated. Once you get it tuned, it will do an excellent job!

Bill

http://i299.photobucket.com/albums/m...h/P9070061.jpg

as does every carb with a vacuum secondary... the edelbrocks and the new demon 625 has secondaries that work off of airspeed instead of vacuum signal (like a holley), but either can be tuned to deliver the same results.

gearheadslife 12-14-2012 07:15 AM

Quote:

Originally Posted by ap72 (Post 1622589)
as does every carb with a vacuum secondary... the edelbrocks and the new demon 625 has secondaries that work off of airspeed instead of vacuum signal (like a holley), but either can be tuned to deliver the same results.

the q-jet small primaries allows better mpg and cruise than you'll EVER
get from a square bore carb


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