How To Build Horsepower — Vol. 2: Carburetors & Intake Manifolds

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Item # SA52  ISBN: 1884089143




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Acclaimed automotive technical writer David Vizard examines the finer points of carburetors and intake manifolds, looking for the smallest of modifications and upgrades which often result in large performance gains.

Includes Carter, Holley, Predator, Weber, Dellorto, and Mikuni carbs, dozens of factory and aftermarket manifolds, tunnel ram intakes, etc. Also covers carb calibration methods, analysis of different designs, mixture ratios, and test results of various carb and intake combinations.

Table of Contents:

• Chapter 1: Performance Filtration | Significant Pressures and Flows | Fliter Flow | Booster Buffeting | High Speed Airflow | Improving Efficiency | Power Production | Power and Temperature | High Output Filtration | Filter Clogging | Performance and Cost | Filter Tests | Element Sizing Tips.

• Chapter 2: Cases, Cool Air and Ramming | Short and Tall Stacks | Calculating Ram Pressure | Pressure Potential | Pressure Balance | Ram Air Tips | Cool Air Tips | Pressure Vs. Density.

• Chapter 3: Basic Carburetor Function | The Venturi | Corrections | Trimming the Fuel Curve | The Emulsion Tube | Emulsion Tube Selection | Power Valves and Mixture Spread | Lean Cruise Mix | Idle System | Transition Circuit | Accelerator Pump Circuit | Cold Start System.

• Chapter 4: Properties of Mixtures | Lean Burn | Intake Manifold Basics | Cylinder Heads | Atomizing and Power | Pump Fuel Comparison | Unleaded High Octane | Octanes Tested | Fuel Distribution | Race Fuels | Carb Calibration | Chassis Dynos | Plug Reading | Oxygen Sensors | Air Fuel Ratio Requirements | Fuel Supply | Fuel Flow Requirements | Flow and Pressure | Bypass Systems and Pressure Regulators.

• Chapter 5: Induction Basics | Induction Pressure Pulse Tuning | Basics | Helmholtz Plenum | Length and Volume | Port Area.

• Chapter 6: Holley Carburetors | Spread Bores | 4150 and 160 Series Carburetors | 4010 Series Carburetors | 4011 Series Carburetors | 4500 Series Dominators | Carburetor CFM and Engine Demand | Airflow Capacity Influences | Computing Required Airflow | Carb CFM Correction Factor | Minimizing Manifold Pressure Losses | Carb Flow Vs. Test Pressure Drop | Recommended Reading | Effective Use of More CFM | Calibrating Holley Carburetors.

• Chapter 7: Performance Mods for Holleys | Air Flow | Booster Gain | Idle and Cruise Quality | Transition Circuit Modifications | Float Bowl Modifications | Rapid Recalibration Methods | Holley's Electronic Calibration | Weber Jet Planes | Carb Shop Speed Blocks | Fine Tuning with Weather Changes | Density Tuning | Weather Station/Computers | Booster Performance | Flowing More Air | Four Corner Idle | Transition Circuit Fuel Metering Mods | Other Considerations.

• Chapter 8: Performance Mods for Q-Jets | Air Flow and Boosters | More Flow and More Signal | Idle System Mods | Transition and Cruise Circuits | Idle System | Transition and Cruise Calibration | Main Circuit | Accelerator Pump Circutis | The Air Valve.

• Chapter 9: Other Performance Carbs | Carter and its Descendants | Predator Carbs | SU Carbs | Modifying SU Carbs | Ram Pipes | Length Tuning | Dellortos, Mikunis and Webers | IR Carburetion in Practice | Calibration Techniques | Idle System | Accelerator Pump Circuit | Choke Sizing.

• Chapter 10: Manifold Design Basics | Power and Heat | CR Increase | Aluminum Vs. Iron | Manifold Design | Reduced Carb Capacity | Buying the Right Manifold | Fuel Distribution | Wall and Port Fuel Flow | Vortex Generators.

• Chapter 11: High Performance Intake Systems | Manifold Change | More Cubic Inches | Small Engines | IR Systems and V8s | Manifold Comparisons.

• Chapter 12: Modifying and Building Manifolds | Modifying Stock Manifolds | Modifying Single Plane Manifolds | Plenum and Port Entrance | Port Extensions | Manifold Floor and Port Form | Port Design | Tunnel Ram Manifolds | Tunnel Ram Plenum Volumes | Sheet Metal Manifolds | Port Taper | Building a Performance Manifold | Custom Manifolds.

• Chapter 13: Sources.

How To Build Horsepower — Vol. 2: Carburetors & Intake Manifolds