I'm curious about something. I'm wondering about figuring out
cylinder head thickness specs for certain 'target' compression ratio
figures.
Years ago I acquired a TR6 motor whose cylinder head had been heavily
shaved, but I didn't have any way to know what the compression ratio
was. So, using a little algebra (wouldn't my math teachers be
proud?) I figured out what the compression ratio for that head should
be based on its thickness as compared to Kastner's measurements for
10 or 10.5:1 and based on the stock thickness spec. According to my
figures, that cylinder head has a compression ratio of 11.8:1. Ouch!
No wonder the ring lands on the pistons had shattered!
That all seems convincing enough, but the trouble is I don't know if
the relationship between head thickness and compression ratio is
linear. If it's not, then I don't think my numbers are accurate.
Despite all that figuring, I really and truly belong in the home for
the mathematically challenged, so I can't guess as to whether that
relationship should or should not be linear. Anybody know if you can
extrapolate from known specs to get thicknesses for a given
compression ratio in this way? Assuming my arithmetic was correct
all those years ago, should my 11.8:1 figure be correct?
--
Pete Chadwell
1973 TR6
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