Demon Carb

[casaleenie]

Going to make the conversion from the Holley Carb that came with the engine from SA to a Demon Carb...Cost of a kit and the rebuild would be comparable to cost of a new carb... My trusted mechanic has contacted Demon with the engine specs and is waiting to hear from them with a recommendation on size.

Any thoughts or ideas?

AL

[Russ Dickey]

Al:
I think you've got a little more motor than I do, but I contacted Barry Grant as well and they recommended the Speed Demon 650 w/mechanical secondaries (P/N 1282010) for my 351. However, after all of the advice that I got from the guys on this forum, I am going with the vacuum secondary version.

I've talked with local guys that run the Demons, as well as guys at CC and Corral.net who use them, and I've heard many, many good things about Barry Grant carbs, with only a couple of guys who had complaints (and it was related to customer service and not the carbs themselves).

My mind is made up. I'm going with a Barry Grant, too.

Russ

Unique 289FIA - Viking Blue

[gasman]

There have been several previous threads on the topic of carburetors. I removed the Holly in favor of a 750 CFM carburetor built by Quick Fuel Technology with a metering block and four post adjustment. It has vaccum secondaries and makes the car run incredible. Rick Bagley was kind enough to spec it out for me with their customer service people who were first rate. I don't say this in a boastful way, the Barry Grant and Speed Demon carburetors were on my list before talking to Rick. I am however very pleased with the selection made and can't possibly know if the performance from other manufacturers would have been equal.

Steve Foushee
Unique #4279389

[sllib]

I called Barry Grant for advice on a carb for my as-yet-unbuilt motor (Dart 427W w/4.125" bore, AFR 205's, mech. big-bump roller cam, Vic Jr., etc) and they recommended the 750 Race Demon w/mech. secondaries. I did the research and had planned to use the 850 Speed Demon, so now I'm confused. I have a while before I put the parts together, so maybe I'll call them again and see if they give the same advice.
Bill Stradtner

[clayfoushee]

I forget who I heard this from, but one very knowledgeable source here (Eliminator??? or Brent?????)said, while BG is very good, they tend to think everyone using their stuff is drag racing......FWIW.

Clay

'98 Unique #9299, 427FE side oiler, top-loader (close), 3.31 rear

Annapolis, MD

[Tony Radford]

Bill, it has to do with your specific motor config. I've got a 427W stroker as well and they put me into a 750 Mighty Demon (mechanical). Another local Cobra guy has an engine configured like mine and was also recommended a Mighty Demon by BG. A number of the 396 stroker guys have been set up with Speed Demons. Sounds like your motor is radical enough to push you up another notch.

427SC, Torch Red / white stripes
427 Windsor Stroker from Southern Automotive
Delicious example of Beauty + Power.

[Brent]

The number one reason most high performance engines don't run the way should is the carburator is too big. If you want to dyno the motor to impress people and drive it on the street you need to buy two carburators.

Remember, dyno #s are only for bench racing.

Brent

[GeorgiaSnake]

I modified my Holley 750 (3310) and it works like a champ. I think I spent about $75 and a Sat. I still have a few mods left but think when I'm finished it will be as good a any BG.

Al - I'll take your old Holley :)

Randy

Unique 289 FIA
Southern Automotive 396
Team III 16's
Brilliant Silver

[eliminator]

My opinion only, there are none of you out there (that have posted on this subject) that have a big enough engine that would require a 850 CFM carb;). The 750 cfm is great with a 427 engine, I personally like vacuum secondaries on a Cobra. I am running a 3310 Holley,780 CFM on a 427 FE that puts ot a "no bull sh!t" 495-505 HP and it dosen't need a bigger carburetor. Barry Grant makes a great carburetor, they however do set them up for Drag Racing. So they have to be tuned and adjusted for a Cobra that takes a Road Racing Carburetor set-up.
Gasman is correct, for the money and application Quick Fuel Technologies does a great job also[^].

Rick
#4279405

[casaleenie]

Choke???? What is the advantage or necessity of a choke... I see some of the carbs are available with electric choke or one is available as an option... I presently don't have a choke on the Holley and that was the was it was built....

thoughts.. and thanks again...

al

AL

[eliminator]

I don't use a choke. A carburetor body made without the choke assembly flows more air than one with the choke tower and the other garbage.

Rick
#4279405

[TurnpikeBoy]

<img src=images/icon_speech_ok.gif border=0 width=17 height=15 alt=Insert Speech Icon: OK>, having now about a year and a half of the Demon, I offer you this.

Had some issues with the 650 Speed Demon on my 302; mostly related to idle richness. I consulted with BG Tech on setup, was advised to use the 650 Speed with mechanical secondaries. Bought it, placed it, and started trying to get idle circuits lean enough to idle without being 1/8th turn off of closed idle adjustment. Tried leaner mains too - altho this has nothing to do with idle circuit. All this led to a fairly nasty stumble when transitioning from idle circuits to booster (main) circuits.

There is a guy in Oregon (I think) by the name of Don Gould, who you will find at bigdaddy@4secondsflat.com - I will assure you right now this man knows his business. And - he WILL respond to your Demon questions. Yes, he is a drag racer, but don't think for a minute this is all he does. He is a BG rep, and a damn good one. BG Tech told me I would have to drill the airbleeds to correct the problems I was having....Don stopped that cold, offered drilling the butterflies (throttleplates)in steps first and correcting jetting issues.

I STRONGLY recommend you make contact with him, either for purchase questions (he sells 'em too) or just for tech help. And his advise is right on the mark, no b.s. involved. I bear witness to his advise - idle mix screws now about 7/8 of a turn off, went back to supplied jet sizes and the car now pulls like a Clydesdale right thru hi gear with NO stumble or richness or troubles whatsoever. All the work he advised took about 20 minutes to do.

Go to him...he will set you RIGHT.

Yeehah

[casaleenie]

Roger,

I've sent an e-mail off to Don in regards to the Demon..

Thanks for the help...

al

AL

[rdorman]

I something wrong with the carb Al? If it is or was running right I don't know that I would replace it. Especially if it was dialed in for your car/engine. While BG does a good job running well out of the box there is still usually some tuning to be done. Which could lead to dyno time etc which of course greatly increases the investment. What carb is on your car?

I updated my carb and almost wish I had not. The carb I had worked great but was not 'sexy' enough and I wanted a slightly larger carb. After a LONG and painful tuning session it is now close, not perfect but close.

A holley rebuild kit is like $40 and easy to do. A new speed demon is $400, $200 dyno time, $50 in parts, etc. etc.

Of course, I to am thinking of buying a speed demon!

Rick

[casaleenie]

Rick,
Carb $400. Dyno time $200. Begging someone come over to the house and turn my newly installed carburetor 180 degrees to make it right-side up.... PRICELESS......

Rick... there is a reason that I'm not allowed to own tools... [B)]

I'm a danger to myself and others with a tool in my hand....

The mechanic is making a call to Don Gould as I type this for a recommendation of a carb... Hopefully, I can order it this evening so it can be in the mail.... I have a good feeling about this...

On a different note.... I might show up in Columbus this weekend to help... It turns out the wedding is next weekend and not this weekend...[:P]


AL

[Brent]

Al,

I guess a calendar is a type of tool isn't it[?] :D:D


Brent

[casaleenie]

quote:Originally posted by Brent

Al,

I guess a calendar is a type of tool isn't it[?] :D:D


Brent




I walked right into that one!!!!

AL

[gasman]

Brent, very funny.

Steve Foushee
Unique #4279389

[ralphscott]

I'm a little late on this one but I also run a Holley 780 no choke on a 428 FE. I am also interested in the Quick Fuel Technology as I am getting tired of messing with #%^&% thing!!

Ralph back in TN