Mastering Camshaft Degreeing- A Guide to Measuring Camshaft Timing Without a Degree Wheel

How to Degree a Cam Without a Degree Wheel

Cams are an essential component in the engine of an internal combustion engine, providing the lift and duration necessary for the valves to open and close. Degreeing a cam ensures that the camshaft is properly aligned with the engine’s timing. Traditionally, this process is done using a degree wheel, which can be time-consuming and sometimes expensive. However, there are alternative methods to degree a cam without a degree wheel, making the process more accessible and cost-effective for DIY enthusiasts and mechanics alike.

Understanding the Basics

Before diving into the process of degreeing a cam without a degree wheel, it’s important to understand the basics of cam degreeing. Cam degreeing involves determining the position of the camshaft relative to the engine’s crankshaft. This is typically done by finding the top dead center (TDC) of the engine and then measuring the amount of rotation of the camshaft. The degree of the cam is then calculated based on the cam’s lift and duration.

Alternative Methods

1. Using a Dial Indicator: One alternative method to degree a cam without a degree wheel is by using a dial indicator. This tool allows you to measure the cam’s lift and duration by placing it on the cam lobe and rotating the engine. By comparing the readings to the cam’s specifications, you can determine the degree of the cam.

2. Using a Timing Light: Another method is to use a timing light in conjunction with a tachometer. By aligning the timing light with the engine’s ignition coil, you can determine the cam’s lift and duration by observing the spark plug wires. This method requires some practice and a good understanding of the engine’s firing order.

3. Using a Degreeing Tool: There are specialized degreeing tools available that can be used without a degree wheel. These tools typically consist of a set of marks or a digital display that allows you to measure the cam’s lift and duration. By aligning the tool with the cam lobe, you can determine the degree of the cam.

Step-by-Step Guide

1. Prepare the Engine: Ensure the engine is cold and has been running for a few minutes to allow the oil to circulate. Disconnect the battery to prevent accidental starting.

2. Choose the Method: Decide which method you will use to degree the cam. Ensure you have all the necessary tools and equipment.

3. Set the Engine to TDC: Rotate the engine until the number one cylinder is at TDC. This can be done by finding the timing mark on the engine block and aligning it with the pointer on the crankshaft pulley.

4. Measure the Cam Lift and Duration: Using your chosen method, measure the cam’s lift and duration. Compare the readings to the cam’s specifications to determine the degree of the cam.

5. Adjust the Camshaft: If necessary, adjust the camshaft to achieve the desired degree. This may involve rotating the camshaft or adjusting the cam’s position in the engine block.

6. Recheck the Degree: Once the cam has been adjusted, recheck the degree to ensure it meets the desired specifications.

Conclusion

Degreeing a cam without a degree wheel is possible by using alternative methods such as a dial indicator, timing light, or specialized degreeing tools. By following the steps outlined in this article, you can successfully degree your cam and ensure optimal performance of your engine. Whether you’re a DIY enthusiast or a professional mechanic, these methods can help you save time and money while maintaining the efficiency of your engine.