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Post by 4l04ever on Dec 24, 2021 21:14:16 GMT 1
Hi All
Just an FYI for you all
For a 2nd time, I have fitted a good tuned top end from one bottom end to a different one and had to adjust the base gasket to get the squish right.
I have also had this when just changing the crank, so looks to be a combination of engine casing machining and crank assembly.
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Post by midlifecrisisrd on Dec 25, 2021 12:43:31 GMT 1
That would explain the vast standard squish 🙄
Suppose the fact the cases are numbered to match it highlights the fact that when the cases are line bored there is obviously a tolerance on barrel face and bearing position depending on how they were clamped into the jig
Good info 👍
Steve
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Post by reedpete on Dec 26, 2021 16:03:15 GMT 1
Yep, that’s why anytime you change anything that has influence on squish you need to re check it….
Them’s the rules !
FYI. … also the reason why out of the crate, some bikes we clearly crispier than others, the random squish and difference between 2.5mm and 0.9 mm squish both interns of compression , flame speed and % residual end gasses is huge.
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Post by muttsnuts on Jan 1, 2022 14:14:58 GMT 1
yep, done some testing on this on several engines, only recently did a head change on a bike, went from a head gasket and stock head, to one I'd O ringed etc, the difference was night and day - nearly 4bhp gain across the rev range
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