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Flattening the head of an engine block (imgur.com)
submitted 1 month ago by to c/oddlysatisfying@lemmy.world
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[–] 6 points 1 month ago (4 children)

As mentioned in the imgur comments: "Flattening the underside of an engine head after it has been deformed by the heat and possibly has blown the gasket." A quite positive reliability effect in that a flat surface is a better gasket mating surface - means much less likely to have a gasket and overheating problem

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  • [–] 8 points 1 month ago (3 children)

    With a head as warped as this, skimming is a necessity. It simply won’t seal otherwise. Today’s headgaskets are often steelshims or multilayer steel (mls) that requires completely flat matingsurfaces. Back in the day with composite materials you could get away with warped heads and blocks, but they wouldn’t hold as much pressure (power) as modern gaskets.

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  • [–] 2 points 1 month ago (2 children)

    The question is: when they need eight passes to get the head back to plane, how bad is the rest of the block?

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