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post #1 of 9 (permalink) Old 01-17-2007, 05:57 AM Thread Starter
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demon jr

i heard on one of these sites summit doesnt carry them anymore due to problems or complaints.

not sure if that is why, but i have heard real good comments from others whom have used them.

should i or shouldnt i mess with one?
someone said a bad batch was made or something..
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post #2 of 9 (permalink) Old 01-17-2007, 06:11 AM
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demon jr

Great Carbs, once you clean all the junk from the machining out of them. Even Holleys should be completly disassembled for de-burring the castings and cleaning before use too. Demons are a little worse. Call them after you buy one, and they will send you a complete gasket kit. Lots of great inovations for "Go Fast", including larger fuel bowls for the 1/4 mile WOT Runs, on a less the perfect fuel supply system
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post #3 of 9 (permalink) Old 01-17-2007, 12:26 PM
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demon jr

We ditched the Demon Jr. on the king's car after much work and head scratching. Put on a Holley 650 puddle dumper and haven't looked back.
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post #4 of 9 (permalink) Old 01-17-2007, 01:05 PM
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demon jr

I had a 625 road demon jr. on my 302. I swapped it for a 650 holley double pumper and picked up 10-15 rwhp and rwtq as well as a smoother idle and better low end power. The mech. secondaries are a lot more fun too.
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post #5 of 9 (permalink) Old 01-17-2007, 03:10 PM
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demon jr

Well my experiences with Demons and any BG stuff is it's Junk,i wouldn't touch it again.I went back to holley HP stuff and couldn't be happier
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post #6 of 9 (permalink) Old 01-17-2007, 04:07 PM
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demon jr

The Demon Carb is a good carb , I'f you like to tinker with it all the time. There service department never have enough time to help you with your questions .Holley is a great carb ,You may want to tinker with it to get more performance ,But a good carb .Know don't hate me for this next statement, the Eldebroke remanufactured carter or even weber carb is the plug and play carb right out of the box.
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post #7 of 9 (permalink) Old 01-17-2007, 04:08 PM
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demon jr

sorry the eldebroke is a remanufactured carter and it is a remanufactured webor also
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post #8 of 9 (permalink) Old 01-18-2007, 09:46 PM
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demon jr

Demons have their quirks, but they're easy to tune once understood. If you want a Demon, call the guys at and give them your car specs. They'll send one out pretuned and give you GOOD instructions on how to fine tune them.
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post #9 of 9 (permalink) Old 01-19-2007, 05:10 AM
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demon jr

If you have the right carb for the right application, that is step one.

Making sure the carb is working correctly is step two.

Knowing how to Tune the carb is step three.

I would never pull a carb out of the box and drop it on expecting it to work the first time. It takes a good 2 - 3 hours to inspect and clean out a carb and I doubt very much that any manufacturer has assembly workers ( someone that actually knows what they are doing) spending 2 - 3 hours on every carb that comes down the assembly line. If they did, the carbs would be a lot more expensive then $400.00 to $600.00.

Even the best Holley carb, has lots of casting seams that need to be pollished or removed inside the main venturies, the booster venturies also have casting seams that need to be removed.

At My cousins speed shop, you would not belive how many folks come in with carbs out-of wack ( not tuned for the engine), wrong carbs for the applications, or just stupid mistakes installing them, having very restrictive fuel filters, tiny little air cleaners with 30% flow restriction...low or unregulated fuel pressure... too many too list.

Also they often think that factory specs for initial timing is their goal, when they put giant heads, with very efficient chambers. Changes all the ignition aspects... every engine is different if it is not factory stock.

2 years ago, I started helping him rebuild carbs for his customers on the side in the busy season... and any carb can be made to run like all the others, if you know what to do to make that happen.
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