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Author Topic: Trying to determine headgasket compressed thickness  (Read 420 times)

Offline doc_rot

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Trying to determine headgasket compressed thickness
« on: Nov 12, 2018, 14:16:21 »
I'm trying to determine the static compression on my kz750 twin. I have all the figures i need except the compressed head gasket thickness. Everything i have found says "consult manufacturer" for these numbers. My plan right now is to throw in a gasket, compress it and then measure the thickness of the copper rings that are embedded in it. Is this a good way to get this number?

Offline teazer

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Re: Trying to determine headgasket compressed thickness
« Reply #1 on: Nov 12, 2018, 15:05:55 »
Yes.  Arguably, the gasket might be slightly more compressed under tension but it has to be negligible.

A better way is usually to measure the compressed volume using a burette, but that requires taking the head off and sealing the rings with grease and then bolting the head on and measuring and then getting the measuring fluid out.

Offline Tim

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Re: Trying to determine headgasket compressed thickness
« Reply #2 on: Nov 12, 2018, 20:38:34 »
Out of curiosity, given you have the uncompressed thickness of the gasket, if it were say compressed 50%, what would the difference in compression ratio be?

Just wondering what increase in precision getting the exact actual compressed thickness gives you.
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Offline doc_rot

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Re: Trying to determine headgasket compressed thickness
« Reply #3 on: Nov 13, 2018, 01:28:45 »
25% compression would effect the compression ratio by about .3 not much