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Old 12-29-2014, 06:15 AM   #1 (permalink)
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Talking How valve springs are tested

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.


Place the spring to be tested in the spring tester




Compress the spring to the pre set height and read the pressure.



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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Old 01-03-2015, 10:03 AM   #2 (permalink)
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Where do you find the "install height" and spring pressure correlation spec? Like what kind of service manual would you find that in usually? I assume you have a database of some kind to access.
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Old 01-03-2015, 10:14 AM   #3 (permalink)
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Where do you find the "install height" and spring pressure correlation spec? Like what kind of service manual would you find that in usually? I assume you have a database of some kind to access.
Most aftermarket springs have a closed spec, normally close to installed height.

But you can set the spring pressure where needed by going backwards and figure what you want on the nose or open.

as long as the spring will not hit coil bind you can adjust the seat pressure to what is needed by adding shims.
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Old 01-03-2015, 10:20 AM   #4 (permalink)
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But what about OEM spec most FSM only list the free length.

Also, How deep does the plunge cut plunge on a Miata head???

<<<<opens a can of worms
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Old 01-04-2015, 05:48 AM   #5 (permalink)
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If the FSM does not list it, you have to calculate it at teardown. measure the installed height then pull the springs to that and see what the scale says.
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