750 version says it’s out of stock. Wonder how long it would take to get one. Hope it’s not anything like the intake manifolds.BOOT wrote: ↑Wed Jan 12, 2022 4:03 pm Interesting didn't know eddy had a new 4150 carb, looks like they changed a lot up. https://www.edelbrock.com/catalogsearch ... carburetor
Annular Booster Quandary
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Re: Annular Booster Quandary
Re: Annular Booster Quandary
What booster style were you running when you did your open vs. tapered spacer test?1980RS wrote: ↑Sat Jan 01, 2022 12:18 pm I can tell you from experience that the Air Gap will not like the 4 holed tapered spacer as it slowed my car down with it. The 1" open spacer worked great though. As for A/D boosters vs down legs for me it's a toss up as I have run both and have had great results with both. This past year the down legs were better on my pump gas 358 SBC and the winner was my vs FST 850 down leg booster carb. You just have to test them. I know one thing for sure, late in 2020 I tested a BG vs A/D 750 and it was a complete dog and slow as all heck. Turned out the sec side was not opening at all, I fixed that by adding the small pri side tube pick up mod and re-tested it out this spring results, it was a tenth and 1 1/2 mph slower than my 1000 Mighty Demon. Still pretty good compared to what it ran prior.
Re: Annular Booster Quandary
Interesting to know. One racer I've chatted with has these designs on the Air Gap.
Quoted. "When I modify those Intake Manifolds...
I TIG weld the HVH Spacer to the Manifold, and re-shape, contour, port, and blend the Plenum opening and Spacer into one uniform opening.
The material/ areas that have Black Lines outlined, are removed and re-shaped to be more like a Single Plain opening."
The taller Manifold/ larger Plenum area, with the transition from the ported HVH Spacer into the ported shared Plenum space...
along with some Runner transition porting, and Port-Matching... really improve the already great performance of the Intake Manifold.
I'll undoubtedly start a new thread to discuss this further when I'm at that point.
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Last edited by skinny z on Sat Feb 05, 2022 12:20 pm, edited 2 times in total.
Kevin
Re: Annular Booster Quandary
Also interesting to know.1980RS wrote: ↑Sat Jan 01, 2022 12:18 pm I tested a BG vs A/D 750 and it was a complete dog and slow as all heck. Turned out the sec side was not opening at all, I fixed that by adding the small pri side tube pick up mod and re-tested it out this spring results, it was a tenth and 1 1/2 mph slower than my 1000 Mighty Demon. Still pretty good compared to what it ran prior.
I've a Barry Grant 1402020VE which has been an excellent all round carb for the street and strip. The goofy choke mechanism not withstanding.
Easy to tune on a worn out 355 with 71 degrees of overlap and about 10.2:1 CR.
That said, I was going through a high speed lean out at the top end and never got the opportunity to investigate what the issue was. I was dealing with a myriad of problems getting the car dialed in generally speaking.
I'd like to know more about the small primary side tube pick up mod.
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Kevin
Re: Annular Booster Quandary
408swinger : they now say first of March ! I’ve heard that before.
You are only limited by your machinery and your imagination!
Re: Annular Booster Quandary
408swinger wrote: ↑Wed Jan 12, 2022 2:42 pm This is where I think the new Eddie 4150 will be the hot ticket . If they ever release it ....
BOOT wrote: ↑Wed Jan 12, 2022 4:03 pm Interesting didn't know eddy had a new 4150 carb, looks like they changed a lot up. https://www.edelbrock.com/catalogsearch ... carburetor
None of what I've read in their spec blurbs refers to the booster style.
Kevin
Re: Annular Booster Quandary
Wilson Manifolds was pushing their tapered spacers on Facecrook so I asked them if I'd made a mistake buying a 2-incher for my 5,500 peak hp rpm 383 with an RPM Air Gap and a 750 with annular boosters and the reply was "most people buy all three sizes and test them at the track"
I reached out to Mark Whitener (sp?) and he said most-definitely annular boosters with the right body but he's two months out to build anything for me. I asked The Carb Shop about building one and they don't recommend annular boosters; "too much signal."
This is turning into a much bigger pain in the ass than I'd anticipated as I simply do not have $2,500+ for a carb with downlegs, one with annulars, three expensive spacers and the dyno time required to just sort out that one part of the deal.
I know at some point, it is what it is but I'd really like to tighten up the window a little bit.
I reached out to Mark Whitener (sp?) and he said most-definitely annular boosters with the right body but he's two months out to build anything for me. I asked The Carb Shop about building one and they don't recommend annular boosters; "too much signal."
This is turning into a much bigger pain in the ass than I'd anticipated as I simply do not have $2,500+ for a carb with downlegs, one with annulars, three expensive spacers and the dyno time required to just sort out that one part of the deal.
I know at some point, it is what it is but I'd really like to tighten up the window a little bit.
Re: Annular Booster Quandary
Does it have to be one or the other? As in a vacuum secondary with annular boosters? That would be the BG I have.
And the question begs to be asked: What does DV have to say? I'll bet annular booster all the way too.
It seems to me that some dyno shops would have those items on hand for testing. The time to do the testing is another matter.
Kevin
Re: Annular Booster Quandary
BG apparently dropped that line; vs with annulars. After doing some research, it doesn't appear that Holley tech (ha!) even knows much about Demon carbs anyway so I've likely opted out of that line.skinny z wrote: ↑Sun Feb 06, 2022 10:29 amDoes it have to be one or the other? As in a vacuum secondary with annular boosters? That would be the BG I have.
And the question begs to be asked: What does DV have to say? I'll bet annular booster all the way too.
It seems to me that some dyno shops would have those items on hand for testing. The time to do the testing is another matter.
I've probably made too much out of this. Unless I'm all fuggered up, the "problem" with increasing plenum volume is booster signal. I can't see booster signal being a problem with a tapered spacer and annulars. None of the tests I've seen have touched booster style when doing a shootout on 1-inch vs 1.5-inch vs 2-inch. That just says "inconclusive" to me.
And I'd certainly like to think that the dyno shop has his favorite carb and a rack of spacers. Maybe I can get out of my own way long enough to call Pro Systems or someone similar and asking their thoughts rather than getting frustrated and just ordering a QF 750 from Summit and then spending countless hours questioning myself
Re: Annular Booster Quandary
Yep. I'm familiar with the feeling.
The flip side to that has been described to me as analysis paralysis.
Then again, the virtual engine building I've been doing while waiting for the COVID rebound to fully kick in allows me to do just that. But there's no substitute for the real thing. Can't wait for some dyno and track time myself.
Kevin
Re: Annular Booster Quandary
I also had the carb shop tell me and then modified my annular booster to down leg.But I bought another one a 850 and had the same problem with its rich condition so I bought a set BLP metering blocks for it and started tuning it and got to lean out and run like it should.You can do it you just have to make it work.Plus the carburetor shop modifications made my carburetor lean after they made changes to it.
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Re: Annular Booster Quandary
Without real world testing on your combination, it's just a guess. Even a dyno proven combo may not be optimal for the track.RevTheory wrote: ↑Sun Feb 06, 2022 8:07 am Wilson Manifolds was pushing their tapered spacers on Facecrook so I asked them if I'd made a mistake buying a 2-incher for my 5,500 peak hp rpm 383 with an RPM Air Gap and a 750 with annular boosters and the reply was "most people buy all three sizes and test them at the track"
'73 Camaro Z/28 NETO/N
434 SBC 11:1, 1.294, 6.178 @ 108.87, 9.81 @ 134.93 (3060#, Naturally Aspirated, Sunoco Ultra 94)
Chopper Air Port 917-589-1278
434 SBC 11:1, 1.294, 6.178 @ 108.87, 9.81 @ 134.93 (3060#, Naturally Aspirated, Sunoco Ultra 94)
Chopper Air Port 917-589-1278
Re: Annular Booster Quandary
Would annular be the best choice for a heat soaked street intake?
Please Note!
THE ABOVE POST IN NO WAY REFLECTS THE VIEWS OF SPEED TALK OR IT'S MEMBERS AND SHOULD BE VIEWED AS ENTERTAINMENT ONLY...Thanks, The Management!
THE ABOVE POST IN NO WAY REFLECTS THE VIEWS OF SPEED TALK OR IT'S MEMBERS AND SHOULD BE VIEWED AS ENTERTAINMENT ONLY...Thanks, The Management!
Re: Annular Booster Quandary
No. But of you can keep the engine temp between 160-170 and use a cold air intake you can easily run AB’s. Or get a big enough carb so it needs them.
Re: Annular Booster Quandary
I'm hoping for no more than 180* in the summer with a ram air box and cowl-induction hood.
No drier vents this time around, lol
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