90 degree valve cover breather

90 degree valve cover breather


Table of Contents

90 degree valve cover breather

Choosing the right valve cover breather is crucial for maintaining engine health and performance. A 90-degree valve cover breather offers a unique advantage in terms of space-saving design and routing flexibility, making it a popular choice for many applications. This comprehensive guide explores everything you need to know about 90-degree valve cover breathers, addressing common questions and providing valuable insights.

What is a 90 Degree Valve Cover Breather?

A 90-degree valve cover breather is a specialized fitting used to vent crankcase pressure from your engine's valve cover. Unlike straight breathers, its angled design (typically 90 degrees) allows for more efficient routing of the PCV (Positive Crankcase Ventilation) system hoses, especially in tight engine bays where space is limited. This angled design often makes installation cleaner and easier, particularly in modified or custom builds. They are available in a variety of materials (aluminum, plastic, etc.), sizes, and thread pitches to accommodate different engine types and applications.

How Does a 90 Degree Valve Cover Breather Work?

The primary function of any valve cover breather, including the 90-degree variant, is to release pressure that builds up inside the engine's crankcase. As the engine runs, combustion byproducts and blow-by gases accumulate. If this pressure isn't properly vented, it can lead to oil leaks, increased engine wear, and reduced performance. The breather allows these gases to escape, often leading them to a filter or into the intake system for re-burning (in closed PCV systems). The 90-degree angle simply facilitates this process in a more space-conscious manner.

What are the Benefits of Using a 90 Degree Valve Cover Breather?

  • Space Saving: The angled design is a significant advantage in tight engine compartments. It allows for more flexible hose routing, avoiding obstructions and making installation easier.
  • Improved Aesthetics: Many enthusiasts appreciate the cleaner look achieved by using a 90-degree breather, particularly in custom engine builds or where a more streamlined appearance is desired.
  • Enhanced PCV System Efficiency: By optimizing hose routing, a properly installed 90-degree breather can contribute to more efficient crankcase ventilation.

What are the Different Types of 90 Degree Valve Cover Breathers?

90-degree valve cover breathers come in various forms, differing primarily in materials and connection types. Common materials include aluminum (known for durability and heat dissipation) and various plastics (offering lighter weight and often lower cost). Connection types may include NPT (National Pipe Taper) threads, AN (Aircraft-style) fittings, or other specialized connections depending on the application.

How Do I Choose the Right 90 Degree Valve Cover Breather?

Selecting the correct breather depends on several factors:

  • Engine Type: Ensure the breather's thread pitch and size match your valve cover.
  • PCV System Design: Understand whether your system is open or closed and choose a breather compatible with your setup.
  • Space Constraints: Consider the available space in your engine bay to ensure the breather's angled design provides the necessary routing flexibility.
  • Material and Durability: Choose a material suitable for your engine's operating environment and desired lifespan.

What are the Common Problems Associated with 90 Degree Valve Cover Breathers?

While generally reliable, problems can arise from improper installation or using a breather not suitable for your application. These problems might include:

  • Leaks: Ensure the breather is properly tightened and sealed to prevent leaks.
  • Incorrect PCV Routing: Improper routing can compromise the efficiency of the PCV system.
  • Material Degradation: Over time, materials might degrade, particularly under high heat or harsh environments.

This guide provides a comprehensive overview of 90-degree valve cover breathers. Remember to always consult your vehicle's service manual or a qualified mechanic for specific installation advice and to ensure compatibility with your engine's PCV system. Proper selection and installation of a 90-degree valve cover breather are crucial for maintaining your engine's health and performance.