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Old 06-04-2013, 01:39 PM
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Carb calibration sheet, in english?

Was wondering if this information gives any insight on how this carb will act. Is this standard holley 4150 spec? Thanks for the help im sitting here reading this paper and I don't know any more about the carb than I did previously.

How does my jetting compare to a regular OE carb? Can you tell based off of this sheet what the carb was built for or what type of vehicle if would perform best in? Thanks again, im really trying to learn everything I can about carbs. One day I would like to tune my own without having to drive to my dads friends and buy all the beer lol.
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Old 06-04-2013, 07:38 PM
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is this carb a 750 CFM?
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Old 06-04-2013, 09:55 PM
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Yes, it should flow a couple less than 750 cfm though.
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Old 06-04-2013, 11:03 PM
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Quote:
Originally Posted by 0trbo4myCHEVUICK View Post
Yes, it should flow a couple less than 750 cfm though.
Why is that? Nice carb.
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Old 06-05-2013, 12:08 AM
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Quote:
Originally Posted by 0trbo4myCHEVUICK View Post
Was wondering if this information gives any insight on how this carb will act. Is this standard holley 4150 spec? Thanks for the help im sitting here reading this paper and I don't know any more about the carb than I did previously.

How does my jetting compare to a regular OE carb? Can you tell based off of this sheet what the carb was built for or what type of vehicle if would perform best in? Thanks again, im really trying to learn everything I can about carbs. One day I would like to tune my own without having to drive to my dads friends and buy all the beer lol.
It looks to be calibrated similar to a Holley 750 HP carb (#80528). Yours is better than the HP for street or street/strip use due to the annular discharge nozzles though. IMO even if they're a bit more restrictive, they make up for it w/better atomization.

This carb is for a built 350-up small block, could be used on a big block within its limits. It's built more for high performance than any sort of economy. Driveability should be very good on a tuned in (including ignition advance) high performance combo. Definitely not for a stock engine/AT/high rear gears.
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Old 06-05-2013, 08:03 AM
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I originally wanted a 650 cfm for the engine (383). Then I really wanted a 700-725 with annulars. Closest I got was this 750 cfm annular, QF did say that the larger boosters restrict 35-50 cfm depending on rpm.

I did mention fuel economy being a concern when ordering the carb and I had to have it "custom" built to get vacuum secondaries with the annulars.
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Old 06-05-2013, 08:07 AM
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I have also heard all the bad things about annulars running too rich and needing drastic jet changes when swapping to them. I was wondering if some of these counter measures have already been done to the carb.
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Old 06-05-2013, 08:46 AM
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Quote:
Originally Posted by 0trbo4myCHEVUICK View Post
I have also heard all the bad things about annulars running too rich and needing drastic jet changes when swapping to them. I was wondering if some of these counter measures have already been done to the carb.
Annular boosters are way more sensitive and efficient for a street machine where sharp changes to throttle settings and good mileage are goals. They do pose more restriction to the incoming air flow so they drop the CFM rating a little from standard holley boosters in venturies and throttle bores of the same dimensions to this carb.

Tuning to your engine is something that always has to be done to get it to synch up with the overall efficiency of the installed engine. Given that this is sensitive to piston design, compression, head ports and combustion chamber shape, cam timing and lift, ignition type and timing, intake manifold, and exhaust system, not to mention the environment of hot or cold, humid or dry which the manufacturer has no idea of any of this when the carb is ordered they put in jets, emulsion tubes, and air corrections that are some average that will sorta at least get the engine started and running. After that you have to tune 'em to your specifics.

The silver and black finish is a nice touch.

Bogie
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Old 06-05-2013, 08:49 AM
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Quote:
Originally Posted by 0trbo4myCHEVUICK View Post
QF did say that the larger boosters restrict 35-50 cfm depending on rpm. .
An annular carb with vacuum secondaries should provide excellent street manners, even with high gears and a tight stall.

That line by QF is a bunch of crap though, RPM doesn't have a damn thing to do with any of it, you'll lose 30-50cfm with annular boosters period. its a fixed amount and is NOT rpm dependent, the flow rating isn't even tested on an engine its done on a flow bench which is static and has a constant draw- NO RPM involved.

for economy you can try decreasing your jet size a hair an opening up your PVCR a hair, you should at the very least have a A/F and a vacuum gauge when doing this, ideally you'd have datalogging, but that can be a little too advanced for most carb users.
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Old 06-05-2013, 12:45 PM
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I wanted to restrict the 750 quite a bit because i feel like 650 cfm would be plenty. I may have mis qouted QF on rpm effecting booster restrictions. They seemed knowledgeable on the phone but i did feel alittle rushed. We talked about the 383 motor alittle and that it was going in a truck and that i was concerned with economy. They knew i live in texas and knew my goals when building the carb. I did pay extra for '' custom''. Hopefully it will be pretty close out of the box im just concerned with the annulars being too rich.
It was my idea to run annulars and vacuum secondaries not quick fuels. QF only makes annular carbs with mechanical secondaries.

Yes i love the silver and black. I almost splurged on the black diamond series which lowers fuel temps some and looks really good. My wife already wants to kill me for spending 580$ on a carb though.
I just want to get 12 mpg
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Old 06-05-2013, 01:32 PM
How fast is fast enough?
 
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My wife already wants to kill me for spending 580$ on a carb though.
I just want to get 12 mpg
Should have spent less on an EFI system... oh well.
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Old 06-05-2013, 01:43 PM
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Should have spent less on an EFI system... oh well.
Efi for less than 600? Did not relize that this was ANYWHERE CLOSE to reality. Oh well is right.
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Old 06-05-2013, 01:59 PM
How fast is fast enough?
 
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Efi for less than 600? Did not relize that this was ANYWHERE CLOSE to reality. Oh well is right.
mine was around $200.

But I shop craigslist and junkyards.

Junkyard fabrication is a passion of mine, I prefer to build with a lot of modified stock parts just because its "cooler" in my mind than buying a prefabricated solution.
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Old 06-07-2013, 10:34 AM
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Why is there a section of the butterfly cut out? see last pic above.
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Old 06-07-2013, 10:36 AM
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Also when I move the linkage to the WOT position, the butterflys are not fully open. I'm assuming this would be better for MPG.
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