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Determine Head Gasket thickness

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  • Raf99
    replied
    I was thinking of taking the engine out this winter to do head work. But the one part I can't figure out in the rip down is how to determine what thickness of head gasket I should use. (assuming I am going with new head gasket and head bolts which I will have to). I was thinking only an engine shop could do as they would measure clearances between the block/head taking into consideration the piston to valve clearance and other factors.

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  • SSMAccord
    replied
    You might be able to use precision calipers to measure the thickness?

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  • Fleetw00d
    replied
    Engine still assembled? Is there someplace around the head/block where there is a recess in the gasket where you could slip a feeler gauge in? If you have the head gasket out, I suppose you could clamp a section in a vise or vise grips and measure it that way.

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  • Raf99
    replied
    Yep, understand all of that. And ya.. 0.036. But how do I calculate or determine the head gasket I'm currently using?

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  • Fleetw00d
    replied
    Yes, the head gasket thickness is part of the compression ratio calculation. When you say "0.36", I'm pretty sure you mean "0.036". I suppose to maintain a known compression ratio, the thickness of the head gasket would need to be increased by the amount the head and/or block were shaved. So if you started with a 0.036" compressed height gasket and shaved 0.010" off both the head and block, then a 0.056" compressed height gasket would maintain the compression ratio (and valve clearance depending on whether the valves seats were remachined any or not) of the engine.

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  • Raf99
    started a topic Determine Head Gasket thickness

    Determine Head Gasket thickness

    So how does one determine how thick of a head gasket to use? I see several thickness available for the H22, see here. In my particular case it's a sleeved closed block with Arias pistons. I think I was using a .36 prior, but can't remember. Believe this also changes your compression ratio as the volume of combustion is part of the equationż I think there's other factors here too like if your head / block are levelled / shaved and how many times. Any input?

    Thanks
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