An engine valve spring tester is a specialized tool used to measure the strength and performance characteristics of valve springs used in internal combustion engines. Valve springs play a critical role in the engine's operation by ensuring that the valves open and close at the right time and with the proper force. The tester allows mechanics, engine builders, or automotive enthusiasts to assess the condition of valve springs to ensure they meet specific performance criteria. Here's how a typical valve spring tester works: Test Setup: The valve spring is removed from the engine and placed on the tester. The tester consists of a base with a support rod and a moveable arm. The spring is mounted on the support rod, and the moveable arm applies pressure to the top of the spring. Compression Test: The tester compresses the spring to simulate its behavior when installed in the engine. The compression is usually done to a specified height or load. Spring Rate Measurement: The tester measures the force required to compress the spring at a given rate. This data allows users to determine the spring rate, which is the amount of force required to compress the spring a certain distance. Load Test: The tester can also measure the maximum load capacity of the spring before it reaches its coil bind height. Coil bind is the point at which the coils of the spring come into contact with each other, restricting further compression. Spring Deflection: The tester may also measure the spring's deflection at various points during the compression process. This data helps in evaluating the spring's consistency and whether it meets the required specifications. Comparison and Analysis: The test results are compared with the manufacturer's specifications or industry standards to determine if the spring is within the acceptable range or if it needs to be replaced. Using an engine valve spring tester is essential during engine building, performance upgrades, or maintenance to ensure the valves operate correctly and prevent valve float, which can lead to engine damage. It's worth noting that there are various types and models of valve spring testers available, and they can differ in their features and capabilities. Some testers may be manual, while others might be equipped with electronic sensors and data recording capabilities for more precise measurements and analysis.