Blue 2006

Just wanted to share that , on my 1970 built BB motor, i switched from a 750 cfm SpeedDemon downleg booster double pumper Carb....to an 800 cfm Mighty Demon annular booster double pumper Carb ; the low end pull was incredibly stronger with the annulars. In fact, one magazine about a year ago, did a comparison and the annular boosters delivered about 90 ft.lbs greater torque than the downleg boosters (at 4400 rpms) , with both being the same CFM. Just thought id throw that out there for guys considering a Carb change who want max. low end grunt. Sure made the throttle far more responsive.
Dave

enkeivette

I have an annular 750 Mighty Demon, but I switched from a stock Q-Jet... so it's not really a fair comparison. I like it, sure does suck gas though.

SpyderD

I want to do this so bad but I hate to throw away a perfectly good 650DP or even sell it used and shell out $650 for a new annular carb (what I would like to do is find a beat up 750DP, rebuild it, then have someone convert it to annular).

The CarCraft test was VERY compelling, here it is for people that want to read further:

http://www.carcraft.com/techarticles...st/index1.html

oregonsharkman

WOW interesting info I am in the market for a new carb for my (soon to be) +/-500hp stroker motor setup, sounds like annular is the way to go BG 850

I would like to hear any other thought on this subject too

Blue 2006

REPLY: From the article : 'The annular discharge carb was worth a staggering 94 lb-ft of torque at 1,800 rpm mainly because the downleg-booster carb was extremely unstable at that speed.
'

If its off-the-line acceleration youre looking for, annulars are the way to go. On my setup, it was that 'pin you back' feeling after i made the swap in Carbs to annular boosters.

Silver00V6Camaro

69 N.O.X. RATT

I prefer annular booster carbs on most street engines

litevette

Hmmm. Just ordered the Speed Demon 750 w/vaccum secondaries today. Not sure if I need any more torque down low though.

MotorHead

You would think there would only be annular booster carbs out there if you can get that kind of HP and Tq gain, why would anyone want one with downleg boosters, something fishy here

SHAKERATTLEROLL

BLUE 2006 I have to ask why is everything about you blank? Or anyone else that might want to give some insight?

69 N.O.X. RATT

At higher rpms annular booster carbs can pull so much fuel they can sometimes cause the motor to go a little rich, they also block some air flow, there by decreasing the cfm rating of the carb slightly. That being said when they are properly tuned, they are a superior street carb.

Blue 2006

REPLY: Im not sure what you mean by this statement ; I hope it wasnt meant as an insult since your a fellow Corvette hobbiest .

big_G

Must be a "Double secret probation" thing......

litevette

Maybe the word just hasn't gotten out there yet. I'm a fool about carburation, so this is the first I've heard of it. I would've ordered differently had I known.

SmokedTires

If you look to peoples names to the left, you see when they joined the forum, colored stars, location, etc... yours just has you forum name

I wish I had a annular carb to try. I went with the 750dp that BG recommended for me

SHAKERATTLEROLL

SmokedTires is correct I was not being mean just asking why there is nothing there as I have never seen this before.

Bangkok Dean

I think he is on probation till he locates his flux capacitor. Now don’t anyone help him you know the rules he must find it by himself.

SHAKERATTLEROLL

I thought that we now have the Improved Flux Capacitor or did we not bring that online as of yet?

MotorHead

...and I was complaining a while back some forum members don't have enough info in their Public Profile, he dosen't even have a public profile

Maybe he is the trying to brainwash us into getting annular booster carbs over downleg booster carb, like Beta vs VHS wars a while back

I have a Race Demon carb that I am at the moment heavily modifying so I can get 550 - 600 HP out of my motor and still get over 20 mpg on the highway. I just might try these annular boosters in mine since they are replaceable and see if I notice any difference

LS-Five

I went from an 850 Speed Demon to a 800 Mighty Demon with annular boosters on my 496 stroker. The difference was night and day. With the 800 I couldn't get rid of an off-idle bog. I tried changing pump cams, and even a 50cc pump, but I couldn't tune out the bog. The 800 is VERY responsive, it makes the car run out like a raped ape. To me, the power you give up on the top end is well worth what you gain down low.