1.
Compression Ratio Calculation Utility
This first utility is an Excel spreadsheet that allows you
to calculate the current compression ratio of your engine,
given the bore and stroke dimensions, along with the piston
oversize.
Having established the current ratio, it will allow you
to enter your desired ratio, and will automatically calculate
the barrel spacer width required to achieve this ratio.
Easy to use, and with instructions included on a second
worksheet.
I have found this utility invaluable when building racing
engines, and saves much time and headscratching with pen,
paper and calculator! |
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2.
Piston Bore Chart
Another Excel spreadsheet, this time for showing decimal
equivelants for bore sizes from 75mm - 90mm pistons. Caters
for STD bore, +20, +40 and +60 thou oversizes. Also shows
common piston clearance sizes for these bores.
Useful when trying to determine if that piston you picked
up for a fiver at the last autojumble will fit in your brand
new Manx barrel!
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