Head deck height measurment
#1
Drifting
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Join Date: Apr 2004
Location: Tucson AZ, Dallas Tx sometimes
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Head deck height measurment
Anyone have pictures of the pads that you measure to determine how much your head has been shaved? Jon at JME said there are three pads and the stock thickness is .944 inches.
Thanks.
Thanks.
#4
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There's a witness mark on the deck's face. This mark tells you how much deck material you have left before reaching the minimum deck height. It's located just under the #2 intake valve. I'm working on an untouched stock head right now and the witness mark is ".022 deep.
#5
Drifting
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I was told that there are other ones not on the deck surface that can be measured without the removal of the head. JME said there are three of them and that they measure .944 and that the SCCA allow them the measure .913 and .929 for PCA.
Thanks for the input guys but I can not really measure the depth of the witness mark in the deck surface since it is on the head.
Thanks for the input guys but I can not really measure the depth of the witness mark in the deck surface since it is on the head.
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#8
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Joe is right, technically the manual describes where you should measure, but because there is a lot of stuff in the way.........
Worth a try (look at distance A)
Worth a try (look at distance A)
#9
Race Director
That is the exact page I was talking about.
The measurement is not that hard to get to on an NA. I checked this out as a potential method to check compression on 944 spec car.
Does anyone know how much shave would get you to 10.5:1 CR starting the 9.7:1 pistons?
The measurement is not that hard to get to on an NA. I checked this out as a potential method to check compression on 944 spec car.
Does anyone know how much shave would get you to 10.5:1 CR starting the 9.7:1 pistons?
#11
Three Wheelin'
Originally Posted by M758
Does anyone know how much shave would get you to 10.5:1 CR starting the 9.7:1 pistons?
There have been threads on this subject before, which included consideration of valve clearances.