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PTV measurement question.

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Old Apr 22, 2022 | 07:21 PM
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Default PTV measurement question.

I have my dial indicator setup, checker springs and zero lash with an adjustable push rod.

I've taken a few measurements and understand the process now. Which leaves me to ask is the measured distance with the dial indicator the actual clearance or do I have to subtract that from another number?

I understand that with the dial indicator the readings are off about .010. And the more accurate reading is with the clay method. Which ill be attempting next.
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Old Apr 22, 2022 | 07:41 PM
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The dial indicator is more accurate than the clay method for measuring P-V. You'll need to have degree wheel set up and find TDC for No.1 and you'll be looking for the closest reading on the intake and exhaust valves. Typically your closest P-V on the intake occurs 10°-15° after TDC of the intake stroke and roughly 10° before TDC on the exhaust stroke.
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Old Apr 22, 2022 | 07:42 PM
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Old Apr 22, 2022 | 07:43 PM
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These measurements were taken without a head gasket in place.
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Old Apr 22, 2022 | 07:44 PM
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Originally Posted by 01CamaroSSTx
The dial indicator is more accurate than the clay method for measuring P-V. You'll need to have degree wheel set up and find TDC for No.1 and you'll be looking for the closest reading on the intake and exhaust valves. Typically your closest P-V on the intake occurs 10°-15° after TDC of the intake stroke and roughly 10° before TDC on the exhaust stroke.
Right, my degree wheel is on and ive been checking it since initial movement on the gage from before tdc to after.
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