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Decoding the Mystery: A Deep Dive into the 4 Barrel Holley Carburetor Diagram
Author: Mark Johnson, ASE Certified Master Technician with over 30 years of experience in automotive repair and restoration, specializing in classic American muscle cars.
Publisher: Hot Rod Garage Publications, a leading publisher of automotive repair manuals and enthusiast magazines.
Editor: Sarah Miller, experienced automotive journalist and editor with a decade of experience in technical writing and content creation.
Keyword: 4 barrel Holley carburetor diagram
Summary: This article explores the intricacies of the 4 barrel Holley carburetor diagram, providing a comprehensive guide for both novice and experienced mechanics. It uses personal anecdotes, case studies, and detailed explanations to demystify the complex workings of this iconic carburetor. The article emphasizes the importance of understanding the diagram for proper tuning, troubleshooting, and maintenance.
Introduction:
The roar of a powerful V8 engine, the satisfying rumble of a perfectly tuned carburetor – these are the sounds of automotive passion. For many enthusiasts, the heart of that sound lies within a 4 barrel Holley carburetor. But understanding the intricacies of this high-performance marvel often requires deciphering the seemingly cryptic 4 barrel Holley carburetor diagram. This article aims to illuminate that diagram, transforming its complexity into a roadmap for understanding and mastering this legendary piece of automotive engineering.
Understanding the 4 Barrel Holley Carburetor Diagram: A Visual Guide
The 4 barrel Holley carburetor diagram isn't just a collection of lines and labels; it's a blueprint of a finely tuned system. At its core, it represents four distinct barrels, each responsible for delivering fuel to the engine under different load conditions. The diagram will typically illustrate the flow of fuel, air, and the intricate interplay of various components like:
Primary and Secondary Circuits: The diagram clearly distinguishes between the primary and secondary metering circuits. The primary circuits handle low-speed and idle functions, while the secondary circuits kick in during acceleration and high-speed driving. Understanding this distinction is crucial for tuning and troubleshooting.
Power Valves: These valves, depicted on the 4 barrel Holley carburetor diagram, control the fuel flow to the secondary circuits. Their proper operation is essential for smooth power delivery.
Accelerator Pump: The diagram will show the location and function of the accelerator pump, which provides an extra shot of fuel during sudden acceleration, preventing hesitation and ensuring a smooth power surge. A malfunctioning accelerator pump is a common problem, readily diagnosed using the diagram.
Float Levels: Proper float levels are critical for consistent fuel delivery. The 4 barrel Holley carburetor diagram highlights the float chambers and their relationship to fuel level. Incorrect float levels can lead to flooding or lean conditions.
Jets and Air Bleeds: The diagram meticulously illustrates the various jets and air bleeds, which precisely control the fuel-air mixture. These components are crucial for fine-tuning the carburetor for optimal performance.
Personal Anecdotes and Case Studies
My first experience with a 4 barrel Holley carburetor was a humbling one. I was 16, working on my father's classic Mustang, and I foolishly attempted to rebuild the carburetor without a thorough understanding of the 4 barrel Holley carburetor diagram. The result? A frustrating afternoon spent wrestling with a flooded engine and a deeply ingrained respect for the complexities of carburetor tuning. That experience solidified my dedication to mastering the 4 barrel Holley carburetor diagram.
Another memorable case involved a client's '69 Camaro. It was exhibiting severe hesitation during acceleration. By carefully examining the 4 barrel Holley carburetor diagram, I quickly identified a clogged secondary metering jet as the culprit. A simple cleaning resolved the issue, highlighting the diagram's invaluable role in rapid and accurate diagnostics.
Troubleshooting using the 4 Barrel Holley Carburetor Diagram
The diagram is invaluable for troubleshooting common carburetor problems:
Rough Idle: A rough idle often points to issues with the idle mixture screws, air bleeds, or a vacuum leak. The diagram helps locate these components for inspection and adjustment.
Poor Acceleration: Hesitation or sluggish acceleration might be caused by problems with the accelerator pump, power valve, or secondary metering circuits. The 4 barrel Holley carburetor diagram guides you directly to the potential problem areas.
Fuel Flooding: Excessive fuel flooding indicates problems with the float level, needle and seat, or even a clogged fuel filter. The diagram provides a visual reference to identify these components.
Lean Mixture: A lean mixture (too much air, not enough fuel) can cause overheating and engine damage. Using the diagram, you can identify jets and air bleeds responsible for the fuel-air mixture.
Beyond the Diagram: Practical Application and Maintenance
Understanding the 4 barrel Holley carburetor diagram is just the first step. Regular maintenance is essential for optimal performance and longevity. This includes:
Regular Cleaning: Periodically cleaning the carburetor, especially the jets and passages, is crucial to prevent clogging and maintain proper fuel flow.
Float Level Adjustment: Proper float level adjustment ensures consistent fuel delivery. The diagram helps visualize the float bowl and aids in precise adjustment.
Jetting Adjustments: Adjusting the jets can fine-tune the fuel-air mixture for specific applications and driving conditions. The diagram is essential for correctly identifying and accessing these jets.
Vacuum Leak Detection: Vacuum leaks can significantly impact performance. The diagram helps identify potential leak points.
Conclusion:
The 4 barrel Holley carburetor diagram is more than just a technical drawing; it's a key to unlocking the power and potential of this iconic carburetor. By understanding its intricacies, both novice and experienced mechanics can confidently diagnose, repair, and tune their engines for optimal performance. The ability to interpret this diagram accurately translates directly to smoother operation, increased power, and a deeper appreciation for the mechanical marvels that power our vehicles.
FAQs:
1. What are the different types of 4 barrel Holley carburetors? There are numerous variations, differentiated by model numbers (e.g., 4150, 4160, 4180) and specific features. Each model has its own specific 4 barrel Holley carburetor diagram.
2. How do I identify my specific Holley carburetor model? The model number is usually stamped on the carburetor body itself.
3. Where can I find a 4 barrel Holley carburetor diagram for my specific model? Online resources, service manuals, and parts catalogs offer detailed diagrams.
4. What tools do I need to rebuild a 4 barrel Holley carburetor? A basic carburetor rebuild kit, screwdrivers, pliers, and a clean workspace are essential.
5. Can I adjust the carburetor myself, or should I seek professional help? Simple adjustments are manageable for experienced mechanics; complex rebuilds often require professional expertise.
6. How often should I clean or rebuild my 4 barrel Holley carburetor? The frequency depends on usage and driving conditions but generally, a thorough cleaning every few years is recommended.
7. What are the signs of a malfunctioning 4 barrel Holley carburetor? Symptoms include rough idle, poor acceleration, hesitation, flooding, or backfiring.
8. Are there any online resources to help me understand a 4 barrel Holley carburetor diagram better? Yes, numerous websites and forums dedicated to carburetors offer tutorials and diagrams.
9. What is the difference between a primary and secondary metering circuit in a 4 barrel Holley carburetor diagram? Primary circuits control fuel at lower engine speeds, while secondary circuits engage during acceleration and higher speeds.
Related Articles:
1. Holley 4150 Carburetor Tuning Guide: A detailed guide on adjusting fuel mixture screws, idle speed, and other parameters for optimal performance.
2. Troubleshooting Holley Carburetor Problems: A Comprehensive Guide: Covers various issues, their causes, and how to address them using the 4 barrel Holley carburetor diagram.
3. 4 Barrel Holley Carburetor Rebuild Kit Review: A review of different rebuild kits, highlighting their features and suitability for various models.
4. Understanding Holley Carburetor Jetting: An in-depth explanation of the role of jets and how to select the right ones for your engine.
5. Holley Carburetor Power Valve Explained: A detailed explanation of how power valves work and their impact on performance.
6. Vacuum Leaks in Holley Carburetors: Detection and Repair: Techniques for detecting and resolving vacuum leaks, crucial for optimal engine operation.
7. Choosing the Right Holley Carburetor for Your Engine: Guidance on selecting the appropriate carburetor for different engine types and performance goals.
8. Holley Carburetor Accelerator Pump Adjustment: A detailed explanation of how to adjust the accelerator pump for smooth throttle response.
9. Maintaining Your Holley Carburetor: A Practical Guide: Tips and best practices for regular maintenance and cleaning to maximize carburetor lifespan.
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| 4 barrel holley carburetor diagram: How to Install and Tune Nitrous Oxide Systems Bob McClurg, 2012 In this book, McClurg reviews the often-mystical subject of nitrous oxide injection systems with a level head and a clear purpose. This book educates the reader on the properties of nitrous oxide and most-effective way to design, install, and tune complete systems. A definite focus on safety and a need to answer the typical questions associated with the use of nitrous oxide is highlighted, and several complete installations are featured. |
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| 4 barrel holley carburetor diagram: How to Rebuild Small-Block Ford Engines Tom Monroe, 1987-01-01 If you have a small-block Ford, then you need this book! This detailed guide covers the step-by-step rebuilding process of the popular small-block Ford engine. Parts inspection, diagnosis, reconditioning, and assembly are outlined in simple text. Hundreds of photos, charts, and diagrams visually walk you through the entire rebuild. You’ll be able to completely disassemble your engine, recondition the block and cylinder heads, then reassemble and install the engine in your vehicle. There’s even a section on how to perform tune-ups to maximize performance and economy. Sections on parts interchanging will help you identify all parts and determine which ones can and can’t be swapped. This is truly a “hands-on” book. Don’t put off your project any longer. Start rebuilding your small-block Ford today! |
| 4 barrel holley carburetor diagram: Performance Exhaust Systems Mike Mavrigian, 2014-08-15 To extract maximum performance, an engine needs an efficient, well-designed, and properly tuned exhaust system. In fact, the exhaust system's design, components, and materials have a large impact on the overall performance of the engine. Engine builders and car owners need to carefully consider the exhaust layout, select the parts, and fabricate the exhaust system that delivers the best performance for car and particular application. Master engine builder and award-winning writer Mike Mavrigian explains exhaust system principles, function, and components in clear and concise language. He then details how to design, fabricate, and fit exhaust systems to classic street cars as well as for special and racing applications. Air/exhaust-gas flow dynamics and exhaust system design are explained. Cam duration and overlap are also analyzed to determine how an engine breathes in air/fuel, as the exhaust must efficiently manage this burned mixture. Pipe bending is a science as well as art and you’re shown how to effectively crush and mandrel bend exhaust pipe to fit your header/manifold and chassis combination. Header tube diameter and length is taken into account, as well as the most efficient catalytic converters and resonators for achieving your performance goals. In addition, Mavrigian covers the special exhaust system requirements for supercharged and turbocharged systems. When building a high-performance engine, you need a high-performance exhaust system that’s tuned and fitted to that engine so you can realize maximum performance. This comprehensive book is your guide to achieving ultimate exhaust system performance. It shows you how to fabricate a system for custom applications and to fit the correct prefabricated system to your car. No other book on the market is solely dedicated to fabricating and fitting an exhaust system in high-performance applications. |
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| 4 barrel holley carburetor diagram: Chevrolet Inline Six-Cylinder Power Manual, 2nd Edition Leo Santucci, 2011-04-15 Crammed full of all the things that made the original Chevrolet Inline Six-Cylinder Power Manual the bible for new and experienced six-cylinder engine builders, this updated version is a must-have for any serious inliner. From soup to nuts, when you want to build the Chevy six for more power and torque than the factory could ever imagine, there is only one book the experts turn to. And now the second edition is absolutely jam packed with the latest blueprints, interviews, airflow charts, build sheets, racer and hot dog profiles. Thought-provoking ideas will help you build the Chevy six your way! |
| 4 barrel holley carburetor diagram: Jeep Cj Rebuilder's Manual Moses Ludel, 2003 Between the covers of each of these manuals you will find the unit repair and overhaul steps for completely rebuilding a 1946-1971 Jeep CJ! If engine, transmission, transfer case, axle, steering, electrical or metal restoration seem difficult or beyond your sills, here is the fix! Jeep expert, automotive instructor and author of the Jeep Owner's Bible, Moses Ludel demystifies the most complex service procedures. The AMC-era CJ Jeep vehicle is a four-wheel drive icon. Built from 1972-1986, these models offer advanced technology and exceptional off-pavement ability. Today, they remain top contenders on the roughest trails and byways, providing the rugged utility that owners expect from the Jeep brand. If working on your Jeep vehicle engine, transmission, transfer case, axles, steering system, electrical system or body tub has seemed just beyond your skill level, here is the fix! Moses Ludel, Jeep vehicle expert, automotive instructor and author of the Jeep Owner's Bible, demystifies the most complex service procedures. At his Camp Jeep workshops, Moses discovered that hobbyists and professional Jeep vehicle mechanics alike want heavily illustrated, step-by-step 'how-to' manuals. For the Jeep vehicle owner who finds the typical workshop manual impossible to decipher, Moses Ludel breaks ground with this book. The author and photographer/illustrator of more than 2,500 magazine tech articles and five popular Owner's Bible books, Moses undertook the Jeep CJ Rebuilder's Manual to meet the needs of Jeep vehicle owners and restorers. Using a pictorial, step-by-step format, this ambitious effort launches a series of 'how-to' rebuild manuals with a photograph marking each technical step. |
| 4 barrel holley carburetor diagram: Holley 4010 & 4011 Mike Urich, 1989-01-01 How to select the right carburetor. Covers two-barrels from 350 through 560 cfm, plus four-barrels, both mechanical and vacuum secondary from 600 through 800 cfm. Instructions for installation, tuning, disassembly and repair. For automotive and marine applications. |
| 4 barrel holley carburetor diagram: The SU Carburettor High Performance Manual Des Hammill, 2017-08-22 Did you know that SUs can give almost as much performance as Webers & Dellortos? Here’s an expert guide to building and modifying SU carburettors to suit high-performance applications. Includes re-profiling needles and how to ‘jet’ SUs for almost any application. |
| 4 barrel holley carburetor diagram: Ford Small-Block Engine Parts Interchange George Reid, 2015-10-15 If there is one thing Ford enthusiasts have learned over the years, deciphering which Ford parts work with which Ford engines is a far more difficult task than with many other engine families. Will Cleveland heads fit on my Windsor block? Can I build a stroker motor with factory parts? Can I gain compression by using older-model cylinder heads, and will it restrict flow? Is there a difference between Windsor 2-barrel and 4-barrel heads? These are just a few examples of common questions Ford fans have. These and many other questions are examined in this all-new update of a perennial best seller. Thoroughly researched and, unlike previous editions, now focused entirely on the small-block Windsor and Cleveland engine families, Ford Small Block Engine Parts Interchange includes critical information on Ford’s greatest small-block engines and goes into great detail on the highly desirable high-performance hardware produced throughout the 1960s, 1970s, and 1980s. By combining some of the best parts from various years, some great performance potential can be unlocked in ways Ford never offered to the general public. Following the advice in Ford Small-Block Engine Parts Interchange, these engine combinations can become reality. You will find valuable information on cranks, blocks, heads, cams, intakes, rods, pistons, and even accessories to guide you through your project. Author George Reid has once again done extensive research to accurately deliver a thorough and complete collection of Ford small-block information in this newly revised edition. Knowing what internal factory engine parts can be used across the wide range of production Ford power plants is invaluable to the hot rodder and swap meet/eBay shopper. Whether building a stroker Cleveland or a hopped-up Windsor, this book is an essential guide. |
| 4 barrel holley carburetor diagram: Ford Flathead Engines Michael Herman, Tony Thacker, 2016-07-15 Although not the first V-8 engine ever produced, Henry Ford's side-valve V-8, launched in 1932, certainly qualified as the first mass-produced V-8 sold to the public. Because of Henry Ford's stubbornness, the first versions were less than ideal. The technology was in its infancy and cost-cutting measures limited the output and reliability of the early models. Over time, however, the Flattie became the go-to powerplant for a whole generation of new hobbyists who were called hot rodders. The engine maintained its position in the hobby well into the 1950s, even when more modern overhead-valve designs started coming out of Detroit. It's hard to overstate the impact that this simple little engine had on a whole generation of enthusiasts. Even today, people choose a flathead for period-correct builds over far more powerful options. The style and sound of a modified flathead is an iconic part of American history. In Ford Flathead Engines: How to Rebuild & Modify, veteran author Tony Thacker and flathead guru of H&H Flatheads, Mike Herman, take you step-by-step through rebuilding a vintage flathead. One of the most important steps is to actually find a good, usable core; many have been sitting for a very long time and the engine design is prone to cracking. Running changes are also an important consideration when selecting a core, and include cooling system, ignition, and transmission mount. After you have selected a core, Thacker and Herman take you through the entire process of a rebuild, including teardown, parts inspection, machine shop processes, replacement part selection, re-assembly, start up, and break-in. Also covered is a unique performance build completed at the H&H shop for legendary race car team manager and all-around enthusiast Ray Evernham. It all adds up to more than 500 color photos and insider tips on building what could be called the most iconic engine ever built, the Ford flathead V-8. |
| 4 barrel holley carburetor diagram: Chrysler Engines, 1922-1998 Willem L Weertman, 2007-10-26 This book chronicles over 75 years of engine design, development, and production at Chrysler Corporation. Every production engine built by Chrysler is covered in detail, with descriptions, pictures, specifications, and timelines provided for each. In addition to the specifications, the book also looks at the personalities behind the engines' development, and the vehicles in which the engines were used. |
| 4 barrel holley carburetor diagram: American Book Publishing Record Cumulative, 1950-1977 R.R. Bowker Company. Department of Bibliography, 1978 |
| 4 barrel holley carburetor diagram: Popular Mechanics , 1978-12 Popular Mechanics inspires, instructs and influences readers to help them master the modern world. Whether it’s practical DIY home-improvement tips, gadgets and digital technology, information on the newest cars or the latest breakthroughs in science -- PM is the ultimate guide to our high-tech lifestyle. |
| 4 barrel holley carburetor diagram: Maximum Boost Corky Bell, 1997-08-10 Whether youre interested in better performance on the road or extra horsepower to be a winner on the track, this book gives you the knowledge you need to get the most out of your engine and its turbocharger system. Find out what works and what doesnt, which turbo is right for your needs, and what type of set-up will give you that extra boost. Bell shows you how to select and install the right turbo, how to prep your engine, test the systems, and integrate a turbo with EFI or carbureted engine. |
| 4 barrel holley carburetor diagram: How to Build Horsepower David Vizard, 1996 Small mods and upgrades can result in large performance gains! Acclaimed technical writer David Vizard provides you with the latest technical updates to Carter, Holley, Predator, Weber, Dellorto, and Mikuni carburetors, plus calibration methods, analysis of different designs, mixture ratios and intake combinations. |
| 4 barrel holley carburetor diagram: Model T Ford Service Ford Motor Company, 2013-08 Henry Ford's Model T forever changed the world. The car made for the great multitude (as Ford put it) first debuted in 1908 and proved so affordable and so popular that fifteen million were sold through 1927. The Tin Lizzie was the first automobile to be mass-produced on moving assembly lines, and built using interchangeable parts. It proved tough and reliable in everyday use, and cheap enough to spawn the automobile revolution: the car cost $850 in 1909 but amazingly by the 1920s, the price had dropped to a mere $260 due to the perfection of production techniques and economy of scale. Designed by a team that included Childe Harold Willis, Joseph Galamb and Eugene Farkas, the Model T had a front-mounted four-cylinder engine that produced 20 hp and had a top speed of 45 mph. It was a rear-wheel drive vehicle with wooden wheels, and featured a two-speed transmission plus a reverse gear. Although models varied - and many revisions took place over two decades of production - the original version weighed about 1200 pounds. Created in the 1920s and featuring information about the original Model T and the New Model T of 1925, this maintenance manual is an invaluable resource. It was originally intended to educate the men tasked with assembling, repairing and maintaining the Model T, and offers a plethora of information about the car, its design and operation. The text includes chapters on how to take apart and put together the car, how to overhaul the engine and transmission, valve grinding and carbon removal, rod bearings, fitting pistons and rings, correcting noisy timing gears, installation of camshaft bearings, cleaning oil lines, oil leaks, transmission band installation, axle overhauls, refurbishing and replacing springs, radiator repair, starting motor overhaul, and more. It also includes troubleshooting and general servicing information. A must have for any Model T owner, this book is also a terrific reference for the docent, historian, or anyone who ever wondered, how did that work? |
April 8, 2025-KB5054980 Cumulative Update for .NET …
Apr 8, 2025 · The March 25, 2025 update for Windows 11, version 22H2 and Windows 11, version 23H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and …
April 22, 2025-KB5057056 Cumulative Update for .NET …
Apr 22, 2025 · This article describes the security and cumulative update for 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2. Security Improvements There are no new security improvements …
April 25, 2025-KB5056579 Cumulative Update for .NET …
The April 25, 2025 update for Windows 11, version 24H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this …
Microsoft .NET Framework 4.8 offline installer for Windows
Download the Microsoft .NET Framework 4.8 offline installer package now. For Windows RT 8.1: Download the Microsoft .NET Framework 4.8 package now. For more information about how …
G1/4螺纹尺寸是多大？ - 百度知道
Sep 27, 2024 · g1/4螺纹的尺寸大径为13.157毫米，小径为11.445毫米，中径为12.7175毫米，螺距为1.337毫米，牙高为0.856毫米。 G1/4螺纹是一种英制管螺纹，其中“G” …
April 8, 2025-KB5055688 Cumulative Update for .NET …
Apr 8, 2025 · January 31, 2023 — KB5023368 Update for .NET Framework 4.8, 4.8.1 for Windows Server 2022 [Out-of-band] December 13, 2022 — KB5021095 Cumulative Update for .NET …
4比3分辨率有哪些 - 百度知道
Aug 24, 2023 · 4比3分辨率有哪些4比3常见的分辨率有800×600、1024×768（17吋crt、15吋lcd）、1280×960、1400×1050（20吋）、1600×1200（20、21、22吋lcd）、1920×1440 …
1、2、4、6、8、10寸照片的厘米标准尺寸 - 百度知道
1、尺寸换算法则为1英寸=2.54厘米=25.4毫米，常的误差应该在1～2毫米左右，如果误差过大，一定要重新拍否则照片无效 2、特殊 相片尺寸 :黑白小一寸 为22mm*32mm ，赴 美签证 …
英语的1~12月的缩写是什么？ - 百度知道
4、December，罗马皇帝琉西乌斯把一年中最后一个月用他情妇 Amagonius的名字来命名，但遭到元老院的反对。于是，12月仍然沿用旧名Decem，即拉丁文“10”的意思。英语12 …
4分、6分、1寸的管子的尺寸分别是多少？ - 百度知道
1、计算方法. 通常所说的4分管是指管子的通径（内径）为四分。1英寸=25.4毫米，以一英寸的每1/8为一分，两分即为一英寸的1/4 ...
April 8, 2025-KB5054980 Cumulative Update for .NET Framework …
Apr 8, 2025 · The March 25, 2025 update for Windows 11, version 22H2 and Windows 11, version 23H2 includes security and cumulative reliability improvements in .NET Framework 3.5 …
April 22, 2025-KB5057056 Cumulative Update for .NET Framework …
Apr 22, 2025 · This article describes the security and cumulative update for 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2. Security Improvements There are no new security improvements …
April 25, 2025-KB5056579 Cumulative Update for .NET Framework …
The April 25, 2025 update for Windows 11, version 24H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this …
Microsoft .NET Framework 4.8 offline installer for Windows
Download the Microsoft .NET Framework 4.8 offline installer package now. For Windows RT 8.1: Download the Microsoft .NET Framework 4.8 package now. For more information about how …
G1/4螺纹尺寸是多大？ - 百度知道
Sep 27, 2024 · g1/4螺纹的尺寸大径为13.157毫米，小径为11.445毫米，中径为12.7175毫米，螺距为1.337毫米，牙高为0.856毫米。 G1/4螺纹是一种英制管螺纹，其 …
April 8, 2025-KB5055688 Cumulative Update for .NET Framework …
Apr 8, 2025 · January 31, 2023 — KB5023368 Update for .NET Framework 4.8, 4.8.1 for Windows Server 2022 [Out-of-band] December 13, 2022 — KB5021095 Cumulative Update …
4比3分辨率有哪些 - 百度知道
Aug 24, 2023 · 4比3分辨率有哪些4比3常见的分辨率有800×600、1024×768（17吋crt、15吋lcd）、1280×960、1400×1050（20吋）、1600×1200（20、21、22吋lcd）、1920×1440 …
1、2、4、6、8、10寸照片的厘米标准尺寸 - 百度知道
1、尺寸换算法则为1英寸=2.54厘米=25.4毫米，常的误差应该在1～2毫米左右，如果误差过大，一定要重新拍否则照片无效 2、特殊 相片尺寸 :黑白小一寸 为22mm*32mm ，赴 美签证 …
英语的1~12月的缩写是什么？ - 百度知道
4、December，罗马皇帝琉西乌斯把一年中最后一个月用他情妇 Amagonius的名字来命名，但遭到元老院的反对。于是，12月仍然沿用旧名Decem，即拉丁文“10”的意思。英语12 …
4分、6分、1寸的管子的尺寸分别是多少？ - 百度知道
1、计算方法. 通常所说的4分管是指管子的通径（内径）为四分。1英寸=25.4毫米，以一英寸的每1/8为一分，两分即为一英寸的1/4 ...
