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How To Adjust Holley Carburetor Vacuum Secondary Springs

Holley offers some tips on how to properly operate and adjust four-barrel carburetors with vacuum secondary throttle blades. The video describes the various rate secondary springs, how to change them, and the testing procedures to follow to make sure the secondaries open properly for best performance.


 


More Videos...


How To Adjust The Accelerator Pump On Holley Carburetors
How-to adjust the accelerator pump on Holley carburetors to avoid stumbling and hesitation upon acceleration. Tips include: How to check for the clearance between the accelerator pump diaphragm arm & operating lever; how-to select the correct accelerator pump nozzle size, and accelerator pump cam selection and installation. Additional information can be found on Holley's website: http://forums.holley.com/entry.php?428-How-To-Cure-Carburetor-Stumble





Accelerator Pump
Footage taken from Holley Carburetor Installation & Tuning DVD





Vacuum Lines Connection
Footage taken from Holley Carburetor Installation & Tuning DVD





Tuning Holley Carb- Engineering A Street Rod.mp4
Tuning the Holley 850 Carb that comes with the Chevy 502/502 Crate Engine was a fun but often frustrating task. Ultimately had to replace with an 850 Double Pumper. Even the Double Pumper needed modifications to meet our goal of 0 to 60 mph in under 3.5 seconds-which was accomplished. Details of what was done and why are outlined. Full details covered on our web site at www.netWelding.com/Holley_Carb.htm.





How To Adjust Fuel And Float Level On Holley Carbs
Holley demonstrates how to properly adjust the fuel level and the float on Holley four-barrel carburetors.





Holley Power Valve Tuning Tips
How to select the right power valve for your Holley carburetor. Backfires, poor fuel economy and fouled spark plugs are indications of an improperly matched or blown out power valve. This video shows the steps to select and check the power valve using a simple vacuum gauge. Additional information is on the Holley Blog: http://forums.holley.com/entry.php?430-Holley-Power-Valve-Tuning





Quick Start Tuning
Footage from Holley Carburetor Installation & Tuning DVD





How To Adjust The Idle Mixture Screws On Holley Carburetors
Tips on adjusting the idle mixture on Holley carburetors, using a simple vacuum gauge. Proper idle mixture adjustments can prevent bogging, hesitation, rough idle, backfire, stalling and hard starting. Additional information can be found on Holley's Blog: http://forums.holley.com/entry.php?429-How-To-Adjust-The-Idle-Mixture-On-Ho lley-Carbs





Slow motion video Custom Calibrated Holley Performance Carburetor.
Slow motion video of Custom Calibrated HP Hot Rod Series Holley Carburetor. You can find Custom hand built carburetors to your specifications and more at http://www.apsracingusa.com . New Custom Built HP Hot Rod Series 4150 Carburetor 750 CFM This is a Brand New Custom Built Holley Double Pump Carburetor hand assembled by Custom Carb Builder, Ron Blanchard. After the carburetor is built and calibrated to your spefications, it is tested on a LIVE engine to ensure the proper function, reliability and performance. These HP carburetors are ideal for street rods, off road racing, drag racing, and boating applications. Performance Carb has the experience and reputation of making more horsepower than the other guys. So, if you want more BANG for your BUCK, This is the Carburetor to buy! Features: - Base Plate has vacuum port for power brakes/transmission vacuum - Screw-in air bleeds - CNC Top - All metal components - Hi flow needle & seats - Dog leg Boosters - High quality components - Non-stick gaskets - Perfect for high performance street, race, or marine applications - Carbs are tuned on a test engine before shipping - All body surfaces are machined - Performance Carb uses a Superflow 1200 Flowbench for precision balancing & blueprinting of venturies, Booster signals, airspeed and total CFM - Hand built and made in the USA http://www.apsracingusa.com/content-categories/cat-148/performance_carb.htm l Music: http://www.danosongs.com - Doninator Photos: https://picasaweb.google.com/107276310312820030395/CustomHolleyPerformanceC arburetors?authuser=0&feat=directlink Buy at: http://www.apsracingusa.com/content-categories/cat-148/performance_carb.htm l http://www.apsracingusa.com/content-product_info/product_id-1971/holley_hp_ 4500_dominator_carburetor_750_1250_cfm_stage_2.html http://www.apsracingusa.com/content-product_info/product_id-1872/performanc e_carb_holley_hp_outlaw_series_carburetor_4150.html http://www.apsracingusa.com/content-product_info/product_id-2020/performanc e_carb_holley_hp_4150_stage_3_carburetor_650_1000_cfm.html http://www.apsracingusa.com/content-product_info/product_id-2019/performanc e_carb_holley_hp_outlaw_x_series_4150_carburetor.html High performance auto race racing products





Holley 4150 Street HP carb rebuild- Tear- Down-Part 1/3
here is a video i made when I rebuilt my Holley 4150 Street HP carburetor that I purchased at a swap meet. It turns out it was in very clean condition and would not have needed rebuilding but I wanted to make sure it was clean inside. It was a good experience doing the rebuild. It's always good to learn something new. I am not a pro and this is my first Carb teardown so those folks that feel compelled to say what is wrong with what they see, please don't bother. Remember what your Mom said, "if you can't say something nice..."





Overview Of The Holley 4150 Vacuum Secondary Carburetor
A complete overview and explanation of the components and operation of the Holley 4150 vacuum secondary carburetor.





How To Adjust The Secondary Speed Screw On Holley Carbs
How to properly adjust the secondary speed screw on Holley carbs. This procedure is only used on engines with large duration camshaft that have very low vacuum at idle.





Accelerator Pump Cam Selection And Installation On Holley Carbs
Accelerator pump cams on Holley carbs can be swapped out to deliver advanced or delayed accelerator pump delivery depending on your engine's normal idle speed.





Troubleshooting - backfire through carburetor
Footage taken from Holley Carburetor Installation & Tuning DVD





Carburetor Main Jet Tuning - Summit Racing Quick Flicks
In this video Norm breaks down the Main Circuit of a Holley Carburetor. First covering the process of adjusting the Primary Jets, moving into the tuning of the Secondary Jets, and Norm follows that up with talking about the venturi effect and how that plays an important role in how a carburetor works. http://www.summitracing.com/redirect?banner=SocialYT4510





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