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Topic Review (Newest First)
04-09-2008 07:17 PM
htwheelz67 I have decided to buy a mighty demon 750 annular, also Pro-systems agreed to let me return my 950 hp and they will build me a smaller carb, 750 hp or so.

Its always good to have a "backup" I guess, After I receive both carbs I am going to tune them myself and then take my car to Superior Auto in Anaheim CA, I will have them baseline everything and then tune both carbs just for "information" Both carbs should flow similar airflow, but I am guessing they will be real close. The reman demon is under 500.00 (I'm Buying)or 549.00 new, the pro-systems was about 720.00.

I'm not doing this because I have money to burn, I really want efi but it's way more right now and I would like to post real world findings and know for myself what the results are. A lot of people bash demon carbs, some bash holleys but we are all looking for the best HP per dollar spent right?

As far as remanufactured products, I have great luck with them, they are cheaper AND have been gone thru at least twice.......
04-09-2008 06:28 PM
htwheelz67 I still am going to buy another demon, I called prosystems today and they will let me ruturn my 950hp and are going to build me a smaller carb, but like i said I am going to get another demon just to have and compare.

So I decided to try my 625 cfm road demon jr on my 408 as I wont have a carb for a while, I was amazed as it shouldn't work good on my 408 but it idled nice and except for a small part throttle stumble ran great but after about 5 mins of driving it just stopped, I popped the hood and fuel was leaking and I noticed the front fuel bowl was filled all the way to the top and gas was just pouring into the engine, I lent it actually sold it to a friend for his 289 which had major rust in his tank, before he sold the car I gave him an edelbrock and took the demon back.......I could blame BG, but I know what the problem is........

Tech@BG why does a road demon jr run so good when I should have a "mighty demon"? Makes me think a speed demon will work just fine as it did with my 650vs speed demon.

I know duration of cam determines demon types, my int duration is within a speed demon (231.5), my exhaust duration is 2 deg's more than a speed demon (242)

Yet my cam is a custom cam that does not have a lot of overlap, is this a factor? It pulls 13-14hg at idle.
04-09-2008 01:01 PM
barnym17 Again guys I got to say the one time I've messed with a BG carb and it was wrong for the application, no fault of BG's explained the situation and they were gracious to take it back for a full refund with no problems.
04-09-2008 12:56 PM
malc I did check it out before assembly.

BG and Summit need to kiss and make up, Jegs are way too expensive to use for overseas, so Iīve used Holley parts from Summit.
04-09-2008 12:53 PM
Tech @ BG I noticed the blue Holley gaskets............. If you used the holley rebuild kit you may want to double check the main body to baseplate gasket against the demon and make sure all the holes line up in it.
04-09-2008 12:43 PM
malc I got my Demon back in 2005 and a few weeks ago I gave it itīs first overhaul, the only thing it really needed was a new power valve.








All done, no big surprises and no aluminum shavings.
The only changes I made was to adjust the transfer slots.



Ainīt that the coolest carb stand you ever did see.......................
04-09-2008 12:12 PM
Tech @ BG
Quote:
Originally Posted by cool rockin daddy
Just hilarious. People buy Demons thinking they are just like their holley, tune it the same way, size it for the engine the same way, and then wonder why they don't run. Big joke!

Before anybody says what about the aluminum shavings I found in my carb, unfortunately it can happen. A powerwasher fails in the plant and something doesn't get flushed like it should. You would be amazed how often it happens at the Big Three in their transmission plants on valve bodies. Part of the game when machining aluminum. BG and Tech@BG always answered my questions promptly. Problem with customer complaints is 5% of satisfied people let a few people know they are satisfied and 100% of people that are unsatisfied left everybody know it.
Thanks for the compliments and you would be correct . I think the biggest thing though is that we are here on the boards and trying to help as opposed to the others that choose not to. We monitor nearly 400 boards and help where we can and also make note of what the other members have to say regarding issues with our products. This information then gets relayed to the production side to help in the QC process. In some of the cases we get blamed for , you would be correct in that someone bought the wrong carb or one too big and because they cant exchange it or get their money back they go on to bash us . I recently had a case where a customer called me direct telling me they had stripped out the carb fittings and bowls tring to install them and wanted us to send them out free replacements along with some other parts. We advised them we would need to look at the old ones first to see if it was a defect or not so about a week later their warehouse calls wanting to send a defective carburetor back that the customer claims was full of shavings. I advised them of what was going on and we came to the conclusion it was the same customer. When the carb got here we checked it and found out that the carburetor had actually been on a car that had a fire and they cleaned it up to try and hide the damage but missed a lot. The carb was then returned to the warehouse for them to return to the customer. In legitimate warranty cases though we are fairly flexible and if it turns out to be an actual defect a lot of times we still take care of it even past the warranty period.
04-09-2008 11:52 AM
Tech @ BG
Quote:
Originally Posted by malc
So in effect the customer doesīnt have to prove the item defective.
I assumed if you made a wrong choice in a purchase that was no ground for return.
Defective, yes.
Wrong choice, no.
That is the way it is supposed to work as the warranty is though us and the carburetor would be returned to us for repair or replacement but in the past with some of the accounts we closed this would be the case. We even had one warehouse try to return an old worn out holley in the Demon box . Good thing we open the boxes and check them.
04-09-2008 10:41 AM
cool rockin daddy Just hilarious. People buy Demons thinking they are just like their holley, tune it the same way, size it for the engine the same way, and then wonder why they don't run. Big joke!

Before anybody says what about the aluminum shavings I found in my carb, unfortunately it can happen. A powerwasher fails in the plant and something doesn't get flushed like it should. You would be amazed how often it happens at the Big Three in their transmission plants on valve bodies. Part of the game when machining aluminum. BG and Tech@BG always answered my questions promptly. Problem with customer complaints is 5% of satisfied people let a few people know they are satisfied and 100% of people that are unsatisfied left everybody know it.
04-09-2008 07:57 AM
malc
Quote:
Originally Posted by Tech @ BG
Wish we could but you wouldn't believe the number of requests we get every day for this... We have taken carburetors before that were returned as defective right out of the box they were returned in and bolted them on one of our house cars only to find no problems. These will then go through the reman process and then go back through our dealers as a reman.
So in effect the customer doesīnt have to prove the item defective.
I assumed if you made a wrong choice in a purchase that was no ground for return.
Defective, yes.
Wrong choice, no.
04-09-2008 07:20 AM
32hibo
cant blame a guy for trying....

Thanks anyway.....I dont have a dog in this fight have never tried a BG
04-09-2008 06:37 AM
Tech @ BG
Quote:
Originally Posted by 32hibo
Send me one for my drag car out your RD pile and I will try it....
Wish we could but you wouldn't believe the number of requests we get every day for this... We have taken carburetors before that were returned as defective right out of the box they were returned in and bolted them on one of our house cars only to find no problems. These will then go through the reman process and then go back through our dealers as a reman.
04-09-2008 06:34 AM
Tech @ BG
Quote:
Originally Posted by htwheelz67
Tech@BG, the trans in my mustang is a lentech AOD, with custom 10" converter which used to stall at 2300-2600 with my 351w now with the 408 its 3000 or a bit more BUT that is with the 3.00 gears, I will be swapping rears and going to 3.50 gears also if it still stalls higher than I like I may get a tighter converter as I want OD not to slip on the fwy.

Thats why I'm thinking of vac sec, but what is your recommendation for carb?

I guess I'm lucky as I've had great luck with demon carbs, out of four I did have one problem (casting hole on venturi arm) a dab of jb weld fixed that......
That's good to hear and keep in mind generally you only hear about a product when someone is having a problem with it. There are plenty of threads out there with complaints on everyone elses products as well but unlike the others we do monitor and try to help on the boards and also relay the information to our production people to continue improving our qc. In regards to your carburetor choice with converters 3000 and up [as well as manual tranmissions] we prefer the mechanical secondary carburetors for response and driveability as the engine has a different type of load on it. With this difference the vacuum secondary carburetors can sometimes act eractic.
04-08-2008 08:30 PM
32hibo
have a foot brake car need 850 carb

Send me one for my drag car out your RD pile and I will try it....
04-08-2008 05:41 PM
htwheelz67 Tech@BG, the trans in my mustang is a lentech AOD, with custom 10" converter which used to stall at 2300-2600 with my 351w now with the 408 its 3000 or a bit more BUT that is with the 3.00 gears, I will be swapping rears and going to 3.50 gears also if it still stalls higher than I like I may get a tighter converter as I want OD not to slip on the fwy.

Thats why I'm thinking of vac sec, but what is your recommendation for carb?

I guess I'm lucky as I've had great luck with demon carbs, out of four I did have one problem (casting hole on venturi arm) a dab of jb weld fixed that......
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