How to Build & Power Tune Holley Carburetors

by Hammill, Des

• ISBN13: 9781845840068
• ISBN10: 1845840062
• Edition: Revised
• Format: Paperback
• Copyright: 2005-12-12
• Publisher: Veloce

Summary

This complete practical guide to choosing and setting up Holley carburetors for road or racetrack performance will make sure you get it right. Uniquely, this book allows the identification of complete secondhand carburetors and individual components, including all metering blocks, so you can buy and build with confidence. Now enlarged and updated, the book is presented in the traditional easy to follow format. 2nd ed.

Table of Contents

Introduction & acknowledgements	7	(1)
Introduction	7	(1)
Bigger is not always better	8	(1)
Acknowledgements	9	(1)
Which carburetor?	10	(6)
2300	11	(1)
4150 & 4160	12	(1)
Fire extinguishers: a cautionary tale	12	(1)
Buying secondhand	13	(1)
List Numbers of common Universal Performance carburetors	14	(1)
Boosters	15	(1)
Basic carburetor identification	16	(10)
Introduction	16	(1)
By the numbers	16	(1)
Identification examples	17	(3)
List Numbers	20	(1)
Carburetors with missing List Numbers	20	(1)
Holley Performance Parts Catalog	21	(1)
Metering blocks	21	(1)
Has the metering block been modified?	21	(1)
2300 Series carburetors	22	(1)
4150 and 4160 Series carburetors	22	(1)
Is it a primary or secondary metering block?	23	(1)
Throttle body & shaft assemblies	24	(1)
Butterfly diameters in relation to CFM	24	(1)
CFM ratings in relation to venturi sizes	24	(2)
Choosing the right size carburetor	26	(3)
CFM calculation	27	(2)
Basic carburetor parts	29	(30)
Repair kits	29	(2)
Finding the List Number	31	(1)
Choke	32	(1)
Fuel bowls	32	(1)
`Side hung' fuel bowls	33	(3)
`Centre pivot' fuel bowls	36	(1)
Floats	36	(1)
Power valves	37	(2)
Accelerator pump	39	(2)
Accelerator pump cams	41	(1)
Accelerator pump discharge nozzles	42	(1)
Accelerator pump mechanism fuel bowl non-return valves	43	(1)
Main jets	44	(2)
Needles and seats	46	(1)
Primary metering blocks	47	(2)
Secondary metering blocks	49	(1)
Alternative 4150 mechanical secondary metering blocks	49	(1)
Metering block vent baffles	50	(1)
Secondary metering plates	51	(3)
Fitting metering plates to carburetor bodies	54	(1)
Fuel bowl, metering block, metering plate gaskets	55	(2)
Vacuum secondary diaphragm springs	57	(1)
Vacuum secondary diaphragms	57	(2)
Tuning 2300 two barrel carburetors & the primary barrels of 4150 & 4160 four barrel carburetors	59	(29)
The relationship between two and four barrel carburetors	59	(1)
Fuel supply	59	(2)
Introduction to tuning & adjustment procedures	61	(1)
Fuel level adjustment ('centre pivot' & `side hung' fuel bowls)	62	(3)
Primary barrel idle speed and idle mixture	65	(1)
Secondary butterfly idle adjustment screws (4150 & 4160)	65	(2)
Holes in your butterflies?	67	(1)
Disabling the secondary barrels	68	(1)
Idle speed and idle mixture screw adjustments	69	(3)
Accelerator pump adjustment	72	(1)
Accelerator pump cams	73	(2)
Accelerator pump discharge nozzles	75	(1)
Main jets	76	(1)
Initial road or track testing to establish basic main jetting requirements	77	(1)
Why engines fitted with long duration camshafts need low rated power valves	78	(1)
Fuel bowl leaks	78	(1)
Summary	78	(1)
Further tuning of four barrel carburetors	79	(1)
Specific information on 2300 two barrel Holley carburetors	79	(2)
Accelerator pumps	81	(1)
Main jets	81	(1)
Power valves shutting at high rpm	81	(3)
Power valve selection	84	(2)
Four barrel to two barrel option	86	(2)
Tuning the secondary barrels of 4150 & 4160 carburetors	88	(9)
Using acceleration timing to optimise jetting	89	(3)
Tuning vacuum secondary carburetor secondary barrels	92	(1)
Changing main jet sizes (metering plate carburetors)	92	(1)
Changing main jet sizes (metering block carburetors)	92	(1)
Power valves	92	(1)
Selecting vacuum secondary diaphragm springs	93	(1)
Tuning `double pumper' or mechanical carburetor secondary barrels	93	(1)
Secondary idling system	94	(1)
`Four corner' idle mixture adjustment	94	(1)
Accelerator pump settings	94	(2)
Optimising main jets	96	(1)
Inlet manifolds	97	(4)
Aftermarket carburetor components	101	(3)
Weber carburetor air/fuel metering for Holley carburetors	101	(1)
Secondary metering plates	102	(2)
Appendix -- Holley carburetor numerical listings	104	(23)
Index	127