A little while ago someone posted an excel sheet to help determine exhaust/primary lengths etc given a number of engine characteristics. Does anyone have a copy of this? I can't seem to find it anyway.

Regards,
Andy

Probably not what you were after but how about this?

http://www.mez.co.uk/mezporting/exhaust_length.html

John.

Suspect you're thinking of the one dave ashurst created a few years ago. I've reposted it a couple of times as well.

If you do a search you should be able to find it from that info.