They use standard Holley jets, and gaskets on the 750. They stay in tune about as good as anything else. The only thing I know that is diiferent is the thread size of the bowl intlets is the same a Carter/Edelbrock AFBwell i just picked up a couple and want to no more about them..like are jets available,gaskets,or parts..and can they stay in tune with each other?
The carbs are decent carbs. Its the amnufacture/owner that sucks. I see he is back in action again. Lets hope he learned a little something during his "time out"thanks for the heads up gn7
Pretty typical story.I bought a New 850 Marine Demon, down leg, from Jegs in Nov '10 for a new 540 Dart NA motor going into my lake boat. Put the motor on the dyno in mid Feb and it was too rich in the low RPMs and leaned out at 5000. Spent 1/2 the day screwing with jets and air bleeds before calling the experts. The boosters were too small so jets made no difference and only BG could modify the boosters as they were propriority to Demon carbs. We called Demon and it was the very day they shut the doors and filed bankruptcy so too bad customer. The dyno had a 750 Holley on the shelf and we threw that on and picked up 60HP. Called Jegs and they took it back and shipped a new 850 Holley Marine in 3 days Yea Jegs , they know customer service. I gave the new 850 Holley to the dyno and they put it on another customers motor and dialed it in. Interesting change, the Holley came with 86 jets in the primarys and 96's in the secondaries. The Holley has a secondary power valve so the carb was extremely fat in high RPM's. They changed the jets to 86 on all 4 corners and it was right on through the entire range. so much for perfect out of the box.
Demons look great and I like the changes they made v/s old style Holleys but if they lean your motor out it just aint worth it. The dyo shop likes Quick Fuel that has similar features to the Demon but no marine version
It is interesting that you say that Finn. Because I was a little confused by everything I had seen on the carbs refered to ALL of them a DEMON CARBURATION, not BG. Now that I look at it, every thing else except the carbs is BG Fuel Systems.Barry Grant is not making a comeback under his own name, BG Fuel Systems, or Demon carbs names. Hell he doesn't even own the rights to his name as far as I know. The company that owns Holley purchased the assets of BG and has relaunched the line of carbs. So I'd wager that product support is about the same for eithe brand of carb at this point.
I believe the statement is very accurate.It is interesting that you say that Finn. Because I was a little confused by everything I had seen on the carbs refered to ALL of them a DEMON CARBURATION, not BG. Now that I look at it, every thing else except the carbs is BG Fuel Systems.
Finn, if thats true, that has to be the biggest kick to his nut sack ever. The very company he tried to take on, and if I may say, helped make him till he bit the hand, ends up with his company and the rights to the names. Thats almost priceless! Karma isn't dead.
Make me wonder though, it the new AVS carb wasn't partially complete mold and tooling wise. There is NOBODY inside the Holley company that could ever come up with the idea, let alone the actual look of that thing unless they were taking some good hallucinogen. Just nobody that creative in the company. Place is almost monkey see monkey do. They only make a HP an Ultra HP because everbodyelse forced them to step up or die!
Still, I have no regrets taking off his regulator and tossing it in the trash and installing the big 4 port Holley after taking to those assholes. The regulator was fine, simply needed a diaphram. No dice, no way, send it in. Price, after shipping both ways, 2 cents cheaper than a new one. SCREW YOU! Last product I ever bought, and never recommended them again. Hopefully WHO EVER is runnign the place, makes some changes.
thanks for the facts!