How to test Valve springs
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How Valve springs are checked
I had to check the valve springs for a 4G63T
This is a simple process. But a specialized piece of equipment is needed.
I use a Rimac spring tester with a 300lbs scale.
The first thing to do is set the stop to the correct height.
The spec used is 66lbs @ 1.575
I find that a venier caliper is more accurate than the built in scale.
![](https://www.miataturbo.net/attachments/engine-performance-56/37747-how-test-valve-springs-dscf3967.jpg?dateline=1332518366)
Place the spring to be tested in the spring tester
![](https://www.miataturbo.net/attachments/engine-performance-56/37748-how-test-valve-springs-dscf3966.jpg?dateline=1332518366)
Compress the spring to the pre set height and read the pressure.
![](https://www.miataturbo.net/attachments/engine-performance-56/37749-how-test-valve-springs-dscf3968.jpg?dateline=1332518366)
It is a quick and simple way to have your valve springs checked to make sure they are in good serviceable shape.
Low spring tensions can lead to a lazy rev of your engine and also valve float.
Most of the valve springs I tested I found to be well out of a usable spec.
Most springs I tested fell in the range of 40-55lbs @1.575
Most spring manufactures allow for 10% loss of spring pressure for spring break in.
I had to check the valve springs for a 4G63T
This is a simple process. But a specialized piece of equipment is needed.
I use a Rimac spring tester with a 300lbs scale.
The first thing to do is set the stop to the correct height.
The spec used is 66lbs @ 1.575
I find that a venier caliper is more accurate than the built in scale.
![](https://www.miataturbo.net/attachments/engine-performance-56/37747-how-test-valve-springs-dscf3967.jpg?dateline=1332518366)
Place the spring to be tested in the spring tester
![](https://www.miataturbo.net/attachments/engine-performance-56/37748-how-test-valve-springs-dscf3966.jpg?dateline=1332518366)
Compress the spring to the pre set height and read the pressure.
![](https://www.miataturbo.net/attachments/engine-performance-56/37749-how-test-valve-springs-dscf3968.jpg?dateline=1332518366)
It is a quick and simple way to have your valve springs checked to make sure they are in good serviceable shape.
Low spring tensions can lead to a lazy rev of your engine and also valve float.
Most of the valve springs I tested I found to be well out of a usable spec.
Most springs I tested fell in the range of 40-55lbs @1.575
Most spring manufactures allow for 10% loss of spring pressure for spring break in.
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