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Who runs a Mighty Demon 850 annlar #216150 02/06/09 06:59 PM 02/06/09 06:59 PM
Joined: Aug 2006 Posts: 610 long time lurker, short time p... P PorkyPig OP mopar
PorkyPig OP mopar P Joined: Aug 2006 Posts: 610 long time lurker, short time p...	A buddy picked up new BG Mighty Demon 850 annulr carb from a speed shop closing up. Who uses this carb on a 440 street car and how does it run? They may still have another for about $400 it could be a decent by.

Re: Who runs a Mighty Demon 850 annlar [Re: PorkyPig] #216151 02/06/09 07:45 PM 02/06/09 07:45 PM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	I dyno tested one on 9secondPhils 418 C.I. W2 motor versus a Speed Demon 850 with downleg boosters on back to back test, the Mighty Demon made less power and torque than the Speed Demon did. I also tested a Holley 1050 Dominator using a adapter and that made the most power and torque of any of the three carbs. See if that shop has a Speed demon 850 with downleg boosters and get it or a King Demon or a Holley 1000 HP with downleg boosters or a Holley 950HP or a Holley 1050 dominator, if you can get one at a good price Last edited by Cab_Burge; 02/06/09 07:48 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Who runs a Mighty Demon 850 annlar [Re: Cab_Burge] #216152 02/06/09 07:54 PM 02/06/09 07:54 PM
Joined: Jun 2004 Posts: 1,217 Wellington, FL C cudabunch pro stock
cudabunch pro stock C Joined: Jun 2004 Posts: 1,217 Wellington, FL	Quote: I dyno tested one on 9secondPhils 418 C.I. W2 motor versus a Speed Demon 850 with downleg boosters on back to back test, the Mighty Demon made less power and torque than the Speed Demon did. I also tested a Holley 1050 Dominator using a adapter and that made the most power and torque of any of the three carbs. See if that shop has a Speed demon 850 with downleg boosters and get it or a King Demon or a Holley 1000 HP with downleg boosters or a Holley 950HP or a Holley 1050 dominator, if you can get one at a good price i have the Speed demon also sitting on a 505 chevy motor.The 950 Holley is a way better carb than the Speed Demon.

Re: Who runs a Mighty Demon 850 annlar [Re: Cab_Burge] #216153 02/06/09 08:04 PM 02/06/09 08:04 PM
Joined: Aug 2003 Posts: 407 Great White North Werst coast runya mopar
runya mopar Joined: Aug 2003 Posts: 407 Great White North Werst coast	Seems the holleys always out perform the BG carbs, why is that, they look like they would would be a great carb, or is it a "looks can be deceiving" thing going on.

Re: Who runs a Mighty Demon 850 annlar [Re: runya] #216154 02/06/09 08:12 PM 02/06/09 08:12 PM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	Quote: Seems the holleys always out perform the BG carbs, why is that, they look like they would would be a great carb, or is it a "looks can be deceiving" thing going on. The Speed Demons I have had and used(two of the first 500 built) out perform the Holley 850 I had back then. I had the 850 Speed Demon and a Holley 950 HP flowed by Pettis performance and the Speed Demon out flowed and out ran the Holley 950 HP I have since heard that BGs quality control went to crap later on so maybe there are some good Speed Demons and some bad ones I really like my Holley six pak carbs also and the Holley list #9375 non HP 1050 Dominators on race motors BTW, I am known to be different, and I'm proud of it Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Who runs a Mighty Demon 850 annlar [Re: PorkyPig] #216155 02/07/09 05:27 AM 02/07/09 05:27 AM
Joined: Feb 2004 Posts: 470 Big Chicago A amixon mopar
amixon mopar A Joined: Feb 2004 Posts: 470 Big Chicago	Quote: A buddy picked up new BG Mighty Demon 850 annular carb from a speed shop closing up. Who uses this carb on a 440 street car and how does it run? I ran an Mighty Demon annular carb on my street 440(.040,stoke stroke, Indy SR's, .650ish Roller, Indy Dual Plane, and 10.5 CR) and in my heavy car the throttle response was amazing, not to mention I got that cam to idle about 850 rpm with it. To say the least, I like my BG stuff (pumps maybe a different story ) Anyway, 400 is a good deal on any new carb with Billet metering and base plates, even if you do have to rebuild it to check the Quality Control (or lack there of) of a company. Anyone remember when Holley had a bad rash of metering blocks that had casting flash and junk inside of them? It happens to the best and the oldest companies out there... I think if you go into a situation thinking some (one, thing, product) will fail or is worst than you have had-then it will be! Big Anthony ANTHONYinIRAQ@gmail.com 1984 B150 Ram Wagon 1978 D100 ClubCab

Re: Who runs a Mighty Demon 850 annlar [Re: PorkyPig] #216156 02/07/09 08:45 AM 02/07/09 08:45 AM
Joined: Jul 2003 Posts: 3,377 Rancho Cordova, CA Exit1965 master
Exit1965 master Joined: Jul 2003 Posts: 3,377 Rancho Cordova, CA	I have that carb on a 440 street car. If I'm not mistaken, the CFM label varies on it, and they are best classified by butterfly size. Mine is called an 825 CFM by some, 800 by others, not sure if 850 is the same or not. Anyways now that I have taken care of terrible quality (#65 jets installed in the secondaries when #88 were specd; several metal slivers not loose but present in carb; unfinished drilling of holes in metering block) I am happy with it. It was the only carb I could get to work with my car and idle properly in gear and out. At least, it made it easy since it has that idle eze screw in it. On other carbs I tried (not that they were customized for this motor) when the carb was idling at 900 and I put it in gear it would drop to ~600 and start to croak. I tried drilling butterflies but that didn't seem to help. The demon was made for lumpy cams and makes it easy. Just make sure you pull that thing apart, check for metal, look in holes, and CHECK THE JETS. I pulled mine apart when I got it, found those slivers and unfinished holes, but I didn't think that they would put horribly undersized jets in the secondaries. Check everything.

Re: Who runs a Mighty Demon 850 annlar [Re: Exit1965] #216157 02/07/09 10:37 AM 02/07/09 10:37 AM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	the BG guys say the 850 mighty will flow 1000 cfm out of the box , not too shure about the annular , kinda big boosters , I think they would cut down air flow , anyway we have both a 850 annular & holley 9375 1050 annular for our small block , I like the holley better but cant tell much of a diff in ET , I think its all in the tune up

Re: Who runs a Mighty Demon 850 annlar [Re: emarine01] #216158 02/07/09 11:01 AM 02/07/09 11:01 AM
Joined: Mar 2006 Posts: 2,675 Mt. Eden Ky. Hemi Allstate master
Hemi Allstate master Joined: Mar 2006 Posts: 2,675 Mt. Eden Ky.	I don't have any experience with the Mighty Demon, but I do have a 950 anular Race Demon that was on my 472 Hemi when it was dynoed. The dyno opperator didn't like seeing the Demon carb at all. By the end of the session the Demon had out performed the shops custom built 1000 cfm Holley, that usually gives the best performance on the dyno! There was a few chips in the needle and seat that were removed. None any where else. My Mark 5007309-Henryintake004.jpg (489 downloads) http://marsh-racing.com/Mark%20Mahorney-Allstate.htm 1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019

Re: Who runs a Mighty Demon 850 annlar [Re: Hemi Allstate] #216159 02/07/09 11:50 AM 02/07/09 11:50 AM
Joined: Oct 2004 Posts: 6,293 Northeast, Alpine, NY 9 9 Sec Phill On a road near you
9 Sec Phill On a road near you 9 Joined: Oct 2004 Posts: 6,293 Northeast, Alpine, NY	As Cab posted, we tried three differant carbs on the 416 but there was only 1 HP differance between them, not enough to worry about in my eyes. At the track I tryed a 950 hp and loss .5 in et from the 850 demon I ran. I also tried two carb spacers, 1" and 2". the 2" killed the et, dropped from 7.0 to 7.5, the 1" dropped it to 7.3. This is on a indy W2 intake with an 850 mighty demon....Phill

Re: Who runs a Mighty Demon 850 annlar [Re: Exit1965] #216160 02/07/09 12:50 PM 02/07/09 12:50 PM
Joined: Aug 2006 Posts: 610 long time lurker, short time p... P PorkyPig OP mopar
PorkyPig OP mopar P Joined: Aug 2006 Posts: 610 long time lurker, short time p...	Quote: unfinished drilling of holes in metering block Which ones???

Re: Who runs a Mighty Demon 850 annlar [Re: PorkyPig] #216161 02/08/09 03:46 PM 02/08/09 03:46 PM
Joined: Jul 2003 Posts: 3,377 Rancho Cordova, CA Exit1965 master
Exit1965 master Joined: Jul 2003 Posts: 3,377 Rancho Cordova, CA	They were the ones that went through to the same passage as the air/fuel mixture screws. The passages were perpendicular to eachother, so the holes I am talking about were supposed to go far enough in to penetrate the a/f mixture passage, but when I looked in them, there was only a small hole there but I could see the angle of the drill. It just was not drilled through completely.

Re: Who runs a Mighty Demon 850 annlar [Re: Exit1965] #216162 02/08/09 04:33 PM 02/08/09 04:33 PM
Joined: Dec 2003 Posts: 5,314 Carstairs, Alberta, Canada dave571 master
dave571 master Joined: Dec 2003 Posts: 5,314 Carstairs, Alberta, Canada	Personally I think an 850 mighty is a little big for a street 440. It'll work, but FWIW I replaced a 750 mighty demon that worked really well on my 440, with a 950 hp holley worked by bigs, and saw no improvement in et or mph. I'm not slamming Big's with that statement at all, I'm just saying that any properly set up carb will work, and you only need as much CFM as it'll use. Any more just hurts throttle response, especially on a street car.

Re: Who runs a Mighty Demon 850 annlar [Re: dave571] #216163 02/08/09 09:45 PM 02/08/09 09:45 PM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	Quote: It'll work, but FWIW I replaced a 750 mighty demon that worked really well on my 440, with a 950 hp holley worked by bigs, and saw no improvement in et or mph. I'm just saying that any properly set up carb will work, and you only need as much CFM as it'll use. I have seen the the opposite of your findings on a strip car,446 C.I., 906 heads with a TM7 intake. started the year with a Holley 600 CFM double pumper and switch carbs throughout the year to a 700 D.P., 750 D.P. 950HP and then switch intakes to a Mopar M1 4500 intake and a 1050 Dominator, that car went faster everytime I made the carb bigger Sorry for high jacking this thread, not intentional, just trying to add to this in a positive manner Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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