www.scooterotica.org

I have added a comp ratio calculator to the bottom of my port timing calculators page on http://www.lambretta-images.com.

It calculates both uncorrected and corrected ratio's as long as you know a few of your measurements

no need to register either, non members can now access the page

http://www.lambretta-images.com/forumbb/porttiming.php

Brilliant!

I've also just done a compression ratio calculator (in Excel) that accounts for deck volume, head gasket volume and piston crown volume too. I'll email it to you if you want, you can check my calcs!

Thanks for that - I'll actually be using that soon..........christ i'm boring

Thanks Eden.... That saves me using a calculator much quicker and easier...

More good eden,,,,,,,,,,,

Hi Eden,
good to see you at Al's last Saturday.
Does it work if I input a negative value ........as piston crown protrudes above barrel at TDC.

Yes it works with negative values