'Triple-Quad' carb setups - info or pics anybody??? A bunch of years ago at an ouitdoor car show and swap meet, I saw a Model A coupe with a a 6-71 blown SBC. . What was unusual about it., was on top of the blower, instead of the usual 'single 4-bbl' or 'dual-quqd' set-up, the car had three..count 'em, three, AFBs! The car was a street driven rod too, not a show car. I waited around, hoping to run into the owner to pick his brain about his triple-quad set-up, but never did manage to meet up with him. I've never seen another triple-quad set-up before or since either and was wondering if anyone here has some 'real world. experience with a set-up like this?? Also, does anybody have pics from either 'back in the day' or current, of cars running 'three 4-bbl' carb setups??? Mart3406 =============================
In 2006 at the Oldsmobile club Nats, there was a 66 Cutlass that had four, yes four, Quadrajets. One pair of venturies for each cylinder. I don't think he ever got it to run correctly on the road but that som' bitch would sure wind up qiuck. Called it the QuadQuad
--------------------- Hmmm??? Ya' think it was just tad over carbureted, maybe??? Mart3406 =======================
Several years ago, High Performance Pontiac magazine featured a '66 GTO with three AFBs on a modified tripower intake manifold.
When will it work: 1. when not all the carburetors are actually doing anything (linkage not connected to throttle shaft, secondaries never open, manifold is blanked off underneath, 100 lb. air valve spring) 2. when the carbs are small enough that WOT vacuum does not fall below about 1.5" Hg When doesn't it work? The rest of the time. Generally, the purpose is just what happened: you looked at it. It's called "posing".
Not exactly panic, the monster trucks used to run 3 predators before FI was legal for them, but they had 500+ " motors with blowers BUT in most cases 1 4bbl is plenty so for our purposes it is for looks . Those blower adapters turn up at swap meets now and again , probaly have to use AFB's since it was designed for predators , holleys would be to big
Front & Rear are 1407's with the choke removed, center a 1410 All are jetted .110 front & .104 rear Accel pump in the middle hole. Drilled a 3/8 hole in each air door weight They work fine all are second hand. Paid $100 each off craigslist. Sure, a pair of QFT dominators would be equal or better in performance, but find a pair of them for $300. (more like $2000) WOT AFR drops to 11.0 at the hit from idle, then varies from 11.2-11.7 up to 6800 (data logged with LM-1 wb) Plugs look very good, nice thing is that for some reason these don't have surging idle like many of the holley's
photos i street raced a guy from eagle rock socal on york blvd that had a 55chevy sbengine with 3 holleys ......he drove it daily to his job out in ontario ..... seeing stuff like that as a teenager made me think ............
Panic seems a little hostile, but he brings up one good point, too much total venturi cross section will eventually hurt signal strength on a NA engine. I suppose booster design will have something to do with just how big you can go, but I don't worry about that with my setup. I believe putting them onto of a positive displacement blower improves signal strength enough that it doesn't really matter, in my case the throttle response is quite good, and I don't have any problems with afr. As far as 'posing' I don't go to car shows, just to the track, and most who haven't seen my car run think it is a joke. More than one "expert" has informed me that I would make "way more power" if I got some "good carb's" like Holley dominators... and that AFB's are no good for fast cars. I guess since I still have leaf springs in back I don't have a fast car, and don't need good carbs.
I remember seeing a Quad Quad setup while cruising the bay (e*ay) like three years ago. It was an offy 2x4 with those crossram attachments. I'm sure it was just a dual quad intake with four crossram attachments, sets of two welded to eachother, and then welded to the intake. It looked too out of the ordinary for offy to have done it and it COULDN'T have been able to operate correctly, thus why the guy was selling it?
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