+26 Cylinder Head Fly Cutter

Ahnendorp B.A.S. Fly cut heads for more compression or larger cylinders cnc machining
Ahnendorp B.A.S. Fly cut heads for more compression or larger cylinders cnc machining from www.ahnendorp.com


Welcome to our blog where we delve into the world of automotive tools and equipment. In this article, we will be discussing the cylinder head fly cutter and its importance in engine rebuilding. If you're a car enthusiast or a mechanic, you've probably heard of this tool, but do you know what it does and how it can benefit you? Read on to find out everything you need to know about cylinder head fly cutters.

What is a Cylinder Head Fly Cutter?

A cylinder head fly cutter is a specialized tool used in engine rebuilding to resurface the cylinder head. It is designed to remove any imperfections or irregularities on the surface of the cylinder head, ensuring a proper seal between the head and the engine block. This tool is essential for achieving optimal performance and longevity of the engine.

The Importance of Cylinder Head Resurfacing

Before we dive into the details of the cylinder head fly cutter, let's discuss why cylinder head resurfacing is important. Over time, the cylinder head can develop warping, pitting, or other surface imperfections due to heat and pressure. These imperfections can lead to coolant leaks, poor compression, and overall engine inefficiency. By resurfacing the cylinder head, you can eliminate these issues and restore the proper functioning of the engine.

How Does a Cylinder Head Fly Cutter Work?

A cylinder head fly cutter works by removing a thin layer of material from the surface of the cylinder head. It is typically attached to a milling machine or a dedicated cylinder head resurfacing machine. The cutter spins at a high speed while the cylinder head is held in place, allowing it to shave off any imperfections and create a smooth, flat surface.

The Different Types of Cylinder Head Fly Cutters

There are several types of cylinder head fly cutters available on the market, each with its own unique features and benefits. Let's take a look at some of the most common types:

1. Solid Carbide Fly Cutters

These fly cutters are made from solid carbide, a material known for its hardness and durability. Solid carbide fly cutters are ideal for cutting through tougher materials like cast iron or steel. They are also less prone to wear and can provide a longer tool life.

2. High-Speed Steel (HSS) Fly Cutters

HSS fly cutters are another popular choice for cylinder head resurfacing. They are made from high-speed steel, a material known for its toughness and heat resistance. HSS fly cutters are more affordable compared to solid carbide cutters and can still deliver excellent results.

3. Insert Fly Cutters

Insert fly cutters are designed with replaceable inserts, allowing for easy and cost-effective maintenance. These inserts come in various shapes and sizes, making it possible to achieve different cutting profiles. Insert fly cutters are versatile and suitable for a wide range of cylinder head resurfacing applications.

Benefits of Using a Cylinder Head Fly Cutter

Now that we know how a cylinder head fly cutter works, let's explore the benefits of using this tool:

1. Improved Compression

By resurfacing the cylinder head with a fly cutter, you can ensure a proper seal between the head and the engine block, resulting in improved compression. This leads to better engine performance, increased power, and fuel efficiency.

2. Eliminates Coolant Leaks

Surface imperfections on the cylinder head can cause coolant leaks, which can lead to overheating and engine damage. The fly cutter removes these imperfections, ensuring a tight seal and preventing coolant leaks.

3. Restores Flatness

Over time, the cylinder head can warp or develop uneven surfaces. The fly cutter removes any warping and restores the flatness of the cylinder head, allowing for proper gasket seating and sealing.

4. Extends Engine Life

By maintaining a flat and smooth surface on the cylinder head, the fly cutter helps to distribute the load evenly across the head and engine block. This reduces stress on the head gasket and other engine components, ultimately extending the life of the engine.

Tips for Using a Cylinder Head Fly Cutter

To get the best results when using a cylinder head fly cutter, consider the following tips:

1. Use the Right Speed and Feed

The speed and feed rate at which you operate the fly cutter can greatly impact the cutting performance. Consult the manufacturer's recommendations or seek guidance from an experienced professional to ensure you are using the correct speed and feed for your specific application.

2. Secure the Cylinder Head Properly

It is crucial to securely fasten the cylinder head to prevent any movement during the resurfacing process. This will ensure accurate and consistent cutting across the entire surface.

3. Take Light Passes

When using the fly cutter, it's best to take light passes to avoid putting excessive stress on the cutter and the machine. Taking multiple light passes will also help achieve a smoother surface finish.

4. Check for Proper Surface Finish

After using the fly cutter, inspect the surface of the cylinder head for the desired surface finish. Consult the manufacturer's specifications or refer to industry standards to ensure the surface finish meets the required criteria.


The cylinder head fly cutter is an essential tool for anyone involved in engine rebuilding. It allows for precise resurfacing of the cylinder head, ensuring optimal performance and longevity of the engine. By using a fly cutter, you can eliminate surface imperfections, improve compression, and prevent coolant leaks. Remember to follow the recommended guidelines and best practices when using a fly cutter to achieve the best results. Invest in a high-quality fly cutter and take the time to properly maintain it to ensure its effectiveness for years to come.