BG Demon Carbs are WORTHLESS!!!

[Bowtie67]

I had a 650 Mighty Demon on my 413sbc, had absolutely no issues besides swapping out jets. My second Mighty Demon (750cfm) was nothing but issues, it ran inconsistantly & leaked, I tried all new gaskets, seals, etc. on it and couldnt get it to work right, I sent it back to BG for them to fix and all they did was put new gaskets in it and send it back, and it did the same thing. Luckily I still had my 650 and the metering blocks and bowls where the same, I swapped out the suspected parts and it purrs like a kitten now, unfortunately another individual bought the 650 and has had the same issues I was originally having before swapping out the parts. I like the carbs but I don't think I will be buying anything from BG any more. There Quality has gone down hill dramatically over the past few years, I have heard of broken needle seats right out of the box, Speed Demons that had machine shavings in them seemed to be a very common issue. I am not real fond of Holley but at least they're carburators don't seem to have those issues. I have also talked with BG's tech support and have gotten a hold of some real idiots that don't have a clue.

[cooters]

some demons and avengers work ok without alot of tuning and some will never work good. I find machining to be a hit or miss and believe these companies need to look after the problems. I have lots of experience in carbs, even consult with local racers when i need to and just have not seen alot of good from Demon or Holley SA carbs. They work good at wide open throttle (usually) but lots of problems in between imho. The tech line is no help either.

[pissonNOS]

correct me if im wrong did mopac not drop the demon line due to problems with the carbs?

[Fenny]

Originally Posted by pissonNOS

correct me if im wrong did mopac not drop the demon line due to problems with the carbs?

Nope. They still sell them. http://www.mopacautosupply.com/products.htm. I have a 650 and 750 speed Demon and both work without any issues.

[RetroSBK]

Ive had great luck with the Demon carbs (love that name!) although on this truck Im running a Holley 750 vac sec....

The Demons have always been super easy to tune and easy to work on... UPS might have something to do with it, but most of the time its who you buy it from...

Unless you buy it directly from BG or a large scale parts house, you may well be getting a returned or "lemon" carb, or even a knock off of the real thing...

for my .02, if you would let the name of anything influence your decision to buy it, based on your religious beliefs, maybe you need to go get some serious one on one couch time... Its a NAME for gods sake... its not like there is a 666 on the carb.. no wait, that would be just as stupid of a reason! its a NAME!!!!!!!!!

[stepside454]

If someones religous beliefs affect how they buy stuff....I can respect that, no problem. Barry Grant should have considered that, & he probably did when he choose that name.
It really not much differant than me choosing to try to buy stuff not made in China based on my political beliefs...even if its a quality product, like American Racing Wheels, or eagle Cranks & rods for example

[Liz]

XVIII. Posts regarding politics or religion are strongly discouraged. These posts tend to create pissing matches and will be closed.

can we please stay on topic as to if the carb is crap or not and not the name and issues surrounding it..

[martinkh]

I highly recommend quadra-pukes. Get a performance tuned one if you must, but for reliability, fuel economy and not choking and puking off-road, the Q-jet is hard to beat. There are custom tuned 800cfm versions out there to handle big engines, but usually, people over-carb engines and suffer for it.

[bretcopsey]

I just recently read on another board that Summitt was experiencing a lot of returns on BG carbs. The problem turned out to be chips lodged in passages from the machining process. No idea if it's truthful, or if it could be the cause of your problems, just wanted to pass it along.

[72step]

Okay, where do I start, I don't have Web access at work so I haven't been back to my demon rant post. Well, it was shipped Fedex, and the Jeg's tech also said that Fedex plays soccer with the boxes, but who's fault is that? The first leaking gas Demon was super easy to tune, but I'm done with Barry Grant. Anyway putting Barry Grant behind me...... What I understand is that QuickFuel uses Proform main bodys and the Jeg's tech I talked to told me he had a speed demon which he doesn't like either. He said it's always had issues and has always had little gas leaks. He said QuickFuel/Proform is superior although all they all are is modified holleys like barry grant, but Quick Fuel and Proform do have a couple nicer features. Thanks for all the input and I will post the end results here someday soon. I won't be messing with it for a while anyway as I'm going for Carpal Tunnel surgery next week. THanks...

[72step]

Does anyone know what the difference is between the Quickfuel Super Street, and Quick Fuel Q-Series besides the choke? Is the Q-Series more of a race carb which will make a non radical vehicle run rich?

[70rs/ss]

Did you return the BG? I have one and bought it used, it worked OK but the heli coils pulled out. I was going to redo the heli coils, but I like the idea of a proform body (didn't even think to do the swap). I would really give some thought to what and why. If its a hot rod street racer, then Holley, Proform, etc. But if you are just daily driving, why a hotrod carb like the BG? I personally run all. I have Edelbrocks (good perf/economy), Holley's (good haul@$$ carb) and the Demon (excellent haul@$$ carb) but I need to go through it!! I'd buy the Holley 4150 series 650 double pumper, or a proform. I just bought a used Holley and can/will replace the parts with Proform stuff, just for the looks, cause the Holley stuff works great. Good luck on the CT surgery, I had both of mine done about 16 years ago.

[BP68]

Ever consider a Edelbrock? I stuck a 650 Thunder series on the motor on my rolling chassis. Hooked up gas can and spun it over. Found the dist was off one tooth. Fixed that, tried again and it fired up. Made minor adjustment to idle and it ran perfect. Granted, I haven't had it on the road yet, but I can say it bolted on and started up and sounded good. The thunder series are advertised for their easy tunability.

[masterbeavis]

I bought a xpeed demon about 5(?) years ago and have only had 3 problems with it. I stripped out the upper screws on the float bowl (primary side) which I fixed by using longer screws, and had fuel starvation at WOT after 3 seconds or so. Turns out the previous owner had the fuel regulator set to 1/2 of pressure. He used it on a rock crawler, and hated it. The third problem was I bought the add on choke kit for it, and had nothing but problems getting the choke to work correctly, due to poor fitment and engineering of the parts. This would hit that, this would get stuck there, WTF!!

The good things I can say about it is that it held its tune, alot longer than any other holley I have owned. Those usually stay tuned for a month or so, then needed fooling with.... The truck had good power, and seamless transition into the secondaries.

[72step]

Thanks for the Edelbrock advice guys, but no thanks. I have a newer type Carter AFB, which is basically a Edelbrock with Carter badging, and I hate it. It's by far not a performance carb. THe first leaky demon that actually ran, had my truck running better than ever. It would light up the tires with just a flooring of the gas pedal. I don't mind tinkering with a Holley style carb like the Proform or Quickfuel, I actually think they are much simpler to dissassemble/reassemble than the Edelbrock type anyway. I rebuilt my Carter, and it was just kinda not user friendly when taking it apart. You kinda have to guess at the float levels as there's no sight windows. I'll be happy as soon as I get a carb that runs even if it requires attention along the way. My truck is almost too hyped up for the street but is streetable, so performance is number one. Not to mention the Edelbrocks aren't exactly cheap!!! I'm about 40 bucks in the whole with all the Demon shipping, but it was a $40 lesson that was worth it. I won't touch a BG product if they gave it to me from now on. Right now I'm going to look at the Proform website, and then decide between it and the Q-Series. Will keep you all posted how the Q-Series/Proform compare with the BG. Thanks....

[Silveradobs]

I'v had two BG 725 Road Demons, and have had nothing but problems similar to yours, I just bought a 750 ProForm and it is worlds better than the BG,
Tom-
406 sb in a 56 Chev. pickup

[jimmydean]

Originally Posted by BCOWANWHEELS

i would never buy anything which has an ungodly name attached to it but I,am a CHRISTIAN and that is what i base my life on.
bob

<snip>

I have only "tried" to dial one in without luck. I think it was far too much carb for the application, but a friend of mine thought it would be ok.

That's why I run Carters, They are jimmydean proof.

[bryanw1968]

I still think most BG problems are buying the wrong carb for their application. I bought the wrong BG and it was awful. I bought the right one and it's the best carb I've ever had.

[Tech @ BG]

Since there have been a number of comments about our carburetors here we’d like to comment on them.

First, and foremost we would like to apologize for any issues anyone has had with our products, services, or staff. Remember, all carburetors will need to be tuned to the specific combination they are installed on regardless of what brand it is.

We manufacture our carburetors more specifically than some of our competitors which can lead to some confusion, and issues. Generally we find if the proper carburetor is installed from our product line vs. our competitors we usually have better performance. The problem comes in, when X size carburetor from one manufacture works OK, then the same size in a Barry Grant carburetor doesn’t.
We’ve found some carburetors (less than 1% of what we manufacture) with some debris in them, which is unacceptable. The goal is to have absolutely none, and to build the best product possible.

Since the majority of our products are made from billet components there is a higher chance of these types of issues than with cast components.

In the past a carburetor could have had trapped debris, and pass a flow test, but while getting bounced around during shipment the debris could become dislodged.

We have instituted the following changes to prevent these problems:

1) A vacuum system has been installed in all areas where drilling or machining is done to remove any debris from the parts.

2) A timed lock system has been installed on the pressure washer for the metering blocks to ensure they are flushed for the proper time.

3) Metering Blocks, and Main Bodies go through ultra sonic cleaning before final assembly.

4) Gaskets come from a sealed area to prevent debris from getting on the gaskets before the carburetors are assembled.

5) As always all carburetors are flow tested to proper specifications.

We appreciate the support, and feedback from our customers, and as always use this information to continually improve the quality, of our products, and services.

[Tech @ BG]

72Step,

If you haven't returned the carburetor yet, we can have UPS pick it up from you directly and rectify the problems for you.

[Tech @ BG]

Originally Posted by LockDoc

-Begin rant-
I have had my Road Demon Jr. for about a year and have never been able to get it dialed in. I don't profess to be a carb guru but I know how to read (the manual) and follow instructions & have tried many times. I also called tech support and they more or less brushed me off. By that I mean the rep acted like he didn't want to talk to me and I had to pry any information out of him. I wasn't impressed. Iv'e changed the timing, tried two different intakes, removed the electric pump and installed a manual, etc, etc. Still runs like crap, If you set it so it starts it doesn't run good and if you set it so it runs good it's hard to start. It ran much better with the original Q-jet on it so that is what's going back on this spring. My suggestion would be to spend $100 and get your Q-jet rebuilt and spend the extra $200 on something really useful.... -End rant- ...

Just my 2¢ worth (from experience)

LockDoc

LockDoc,

We'll gladly go through this carburetor for you to make sure it is the proper carburetor for your application, and make sure it is working properly.

[Tech @ BG]

Originally Posted by Bowtie67

I had a 650 Mighty Demon on my 413sbc, had absolutely no issues besides swapping out jets. My second Mighty Demon (750cfm) was nothing but issues, it ran inconsistantly & leaked, I tried all new gaskets, seals, etc. on it and couldnt get it to work right, I sent it back to BG for them to fix and all they did was put new gaskets in it and send it back, and it did the same thing. Luckily I still had my 650 and the metering blocks and bowls where the same, I swapped out the suspected parts and it purrs like a kitten now, unfortunately another individual bought the 650 and has had the same issues I was originally having before swapping out the parts. I like the carbs but I don't think I will be buying anything from BG any more. There Quality has gone down hill dramatically over the past few years, I have heard of broken needle seats right out of the box, Speed Demons that had machine shavings in them seemed to be a very common issue. I am not real fond of Holley but at least they're carburators don't seem to have those issues. I have also talked with BG's tech support and have gotten a hold of some real idiots that don't have a clue.

We apologize for the issues, if you'll send back the 650 we can get the problem rectified for you.

[71chevylowrider]

Yea, it all sounds all good when you say it, but since BG was too good to return my e-mail when I was having major issues with my Road Demon 625, I got rid of it & now run one of your competitors carbs & it works perfect! Oh, & they returned my e-mail also.

[RACINJASON22]

I personally would like to say thank you for your concern and addressing the situations at hand. Particularly on a site such as this. Very good customer feed back IMO. I think more companys should do this kind of R&D.

That being said I am personally one that have had a problem with your product a few years back. Since I have stayed away not wishing to go through problems again. BUT BUT with this kind of customer feed back I am more likely to try your product again in the future. My problems were not with performance issues more on quality control IMHO and, I am glad to see steeps are being made to resolve issues at hand.

Thank You Respectfully RJ22

BTW one the same note as 71 Chevylowrider I also had very bad coustomer service with your tech department but like I stated before this was a few years ago and have heard simalar stories since

[Tech @ BG]

Originally Posted by 71chevylowrider

Yea, it all sounds all good when you say it, but since BG was too good to return my e-mail when I was having major issues with my Road Demon 625, I got rid of it & now run one of your competitors carbs & it works perfect! Oh, & they returned my e-mail also.

Sorry for the issues, sometimes there are problems with email. Glad you've got something you're happy with.