Speed Demon Carb

Adrian

· #2 · Feb 17, 2004

I have 2 friends that have had the Demon Carb and both of them took them off and installed a new Holley. I know a bunch of folks have used them but I tried to help my friends on getting them going and we got close but then both would take a crap. I wanted to try one for myself but the Edelbrock is doing so well I just don't want to fight a good working thing.
Geezer will attest that they are good but you best be a super brain to make them work.

Adrian

Reply

Save

Like

E

Elsboss

· #3 · Feb 17, 2004

There are 4 of 'em we run down here. Mine which is an 850 on my 502, Charlie and Mike both 850's on 540's, and Ron has a 750(?) on his smallblock. All of us had oodles of crap with them. Idle in particular but also panic stops and quick on/off throttle. Ron and Mike took theirs to be professionally setup after failing under the shade tree and are real happy. Charlie bought his 2nd one and finally got it tweaked to perfection. I'm still struggling with mine but only when doing a burnout and letting off real quick or any such quick gas and quick off. I've been very un-scientific trying to get it right.

The tests that Marv has done and we verified when on a DynoJet dyno was that it does indeed give you some horsepower and is great for high performance application. Personally, for most normal street application I'd stick with the Edelbrock except on a bigblock. I hated that surge when the secondaries kicked in and with the Demon, it's just the typical dbl pumper....strong, constant, linear acceleration.

Elliot

See less See more

Reply

Save

Like

V

V-MAN

Discussion Starter · #4 · Feb 18, 2004

Thank you Adrian and Elliot, I respect and appreciate both your opinions and experiences. Since my engine is just a "run of the mill" stocker I think I will hold off on the Demon. Maybe in the future I will swap carbs but for now I'll be happy with the Quadrajet ... it works but I'm sure it could be better.

Don

Reply

Save

Like

V

V8GRUMPY

· #5 · Feb 18, 2004

V-man,

There are a number of high performance carb rebuilders around the country (including Carb Mike) that would be happy to race tune your Q-jet.

There is one shop in Texas that Wag found and they will redo anything...
it runs about $400 to go through the carb and do all of the mods....then do an actual run-in on the unit....they include flow bench numbers and all.

Wag had his gone through by a guy here in St. Cloud who is well known for his GM performance.....so it'll be interesting to see how our bikes run this spring as they have always been almost identical in performance from day one. That's one advantage I guess we have hda, if one changes something we could always have the benchmark of the other bike to rely on to see if it worked.

Tim

Reply

Save

Like

V

V-MAN

Discussion Starter · #6 · Feb 19, 2004

GRUMPY said:
V-man,

There are a number of high performance carb rebuilders around the country (including Carb Mike) that would be happy to race tune your Q-jet.

There is one shop in Texas that Wag found and they will redo anything...
it runs about $400 to go through the carb and do all of the mods....then do an actual run-in on the unit....they include flow bench numbers and all.

Wag had his gone through by a guy here in St. Cloud who is well known for his GM performance.....so it'll be interesting to see how our bikes run this spring as they have always been almost identical in performance from day one. That's one advantage I guess we have hda, if one changes something we could always have the benchmark of the other bike to rely on to see if it worked.

Tim

Tim

Thanks! I know a guy in the Chicago area that did the Valk carb and it made a HUGE difference too. I may go the same route with this carb but it will have to wait for a down time now with riding season about to start.

I may contact Mike and see what he can do. Do you have the info on the guy Wag found in TX? No rush, like I said this will probably wait now. The bike runs strong but I know there is more in the engine ... stock or not.

I would be interested in how his bike preforms this Spring too. Any idea how long the guy had his carb? Keep us posted once the snow and ice is gone ...

Don

Reply

Save

Like

V

V8GRUMPY

· #7 · Feb 19, 2004

Wag gave him the carb a few weeks ago, but there was no rush on it. I think it must be about done.

I'll try to get the name and website for the guys in Tx and post it.

Tim

Reply

Save

Like

A

Adrian

· #8 · Feb 19, 2004

One thing I failed to mention is in Az you are required to pass a smog test each year. My friend put the Demon on his Boss and couldn't get it to pass. His bike is a clutch job so I disconnected the vacuum line to the booster so it should have been as lean as it could but it just slid by the hair on his toe. I think the guy liked the bike and let it slide, but that was the last straw for my pal so he went to a Holley.

Adrian

V-MAN said:
Is anybody using this set-up? Opinions good or bad ...

http://www.bgfuel.com/demon/default.aspx?page=12

Reply

Save

Like

W

Wag

· #9 · Feb 19, 2004

One thing about the pic shown

The Demon pic shown has a vacuum diaphram, they will not fit, they gotta be mechanical secondaries. You all probably know that , just an observation.

Reply

Save

Like

V

V-MAN

Discussion Starter · #10 · Feb 20, 2004

Wag -

Yep your right, I just "stole" the first picture off their site ... not even sure if it's the 650 either :wink: Good catch though! Be sure to keep us all posted on the results of your carb work

Adrian -

I lived in Glendale, AZ for 12 years and remember too well their emmisions program! It was difficult to get a stock set up through at times. I believe their emmisions is more for revenue then "clean air" concerns. If your vehicle failed emmisions test you could pay a "waiver" fee of $50 and still get your sticker. You had to show you spend X amount of dollars to "try and comply" ... humm ... always made me wonder! Lucky for me I only have a vehicle inspection to go through here in Maine - no emmisions.

Reply

Save

Like

Top Contributors this Month