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since I'm at home with lot's of time, but not enough healthy thumbs to do some work on bikes ,
I created this excel file to calculate combustion chambers.

any faults or whatever, please let me know.

http://users.telenet.be/jannemie/Head%20Calculator.xlsx

Good job Jan

added/changed some cell-remarks, and secured the file, so one can't accidently change formula's.

you can easily change the security settings (if you want to change/add something) by clicking on the "check" page at the top. For further info, type "securing excel files" in google, like this one :

http://spreadsheetpage.com/index.php/ti ... and_files/

As a busy Excel user, that is a thing of beauty