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Author
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Topic: annular boosters and Clevelands
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Mpcoluv
Gearhead Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001
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posted 08-26-2001 09:59 AM
   
Have any of you guys ever ran a 750 or 830 holley with annular boosters on a Cleveland with 4V heads?
Specifically does the annular boosters finer atomization enhance power and torque below 4000 rpm?
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 08-26-2001 01:00 PM
From my understanding, the annular boosters do increase the fuel signal and atomization.. This should help out on any engine that may be having mixture problems and poor response at low to mid rpms... the drawback being that they are larger than downleg boosters and could possibly decrease your performance at high rpms....
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 08-26-2001 04:06 PM
I have heard, so take this with multiple grains of salt, that annular boosters can take close to 100cfm off of a carb that didn't have them to start. On lots of cars that are over carbed people throw on those boosters and think that they are the best things since sliced bread, but all they really did was improve the signal through the carb just like they switched to a smaller one. Then they run around telling everyone, "See I told you my 289 would run great with that 750!"------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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Gary Ferringer
Journeyman Posts: 59
From: Kennerdell,Pa.
Registered: Feb 2001
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posted 08-26-2001 04:06 PM
Just to give you an idea as to how they worked for me, I run identical times with a 750 Holley 4010 series with annular boosters, as I do with an 850. The standard booster 750 is consistently 1 1/2 to 2 tenths slower than the 850. I use the annular booster 750, because I have found it also to be a little more consistent than the 850. I always attributed this to the fact that it would be less sensitive to how much heat is in the intake manifold. With the poor atomization characteristics of the 850, I have found that the first run of eliminations was usually the slowest. This is most likely because there is less heat in the intake after the half hour or so intermission, therefore the mixture is not atomizing quite as well in the intake. I have a set of annular boosters sitting here right in front of me that I am going to put into the 850, just as soon as I can find someone to put them in. I was going to buy a tool and do it myself, but for over $250, I might as well spend $400 on an 830, that isn't going to happen any time soon. ------------------
'85 Capri
Cleveland powered
carburetted
6.95 1/8th
@94 1/2 MPH
1.49 60 ft. [This message has been edited by Gary Ferringer (edited 08-26-2001).]
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Butch Jennings
Gearhead Posts: 624
From: No. California
Registered: Apr 2000
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posted 08-26-2001 05:12 PM
I've used the 830 annular on many different combinations and it's always worked flawlessly. It ran as good as the Dominator did on my FE and the 850 sucked. I've never seen another carb that I can throw on a motor and have it work as well as the 830. I just put a pair of them on my 460, I'll let you know how that works in a couple of weeks. If I had a built 351...I'd throw an 830 on it in a flash. I've never considered the annular booster a bandaid at all. ------------------
Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"
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Dave_C
Gearhead Posts: 968
From: Gadsden, Al
Registered: Aug 99
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posted 08-26-2001 05:49 PM
Another vote here for the annular booster. I run a 750 annular booster on my 383W. The choke horn has been removed so I figure it flows 775-780 cfm. (choke horn supposed to be worth 25-30 cfm).Works great, always has. It will spin to 7K with no problem. I think it really helps down low when you have a cam with alot of duration that's not making very much vac. Mine works well with my 262/272 @ .050 roller. It also worked well when IT was a street engine with a 224/236 hyd cam. To be honest I am thinking about switching to another carb, but only because I have hit the point where the carb is the bottleneck. Prob going to get a Holley 950 HP. Looking for a good used one now. Later, David Cole
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