How to adjust a dump valve / BOV?

[tigerdog]

Can anyone here please provide an intelligent, reasoned analysis of dump valve operation and adjustment? Looks like there were forum discussions in the past but the posts are coming up missing. A quick search of the greater internet "series of tubes" turned up so much mis-information, half-baked analysis and boy-racer tuner advice that I decided to ask here. I found only one reference that even sounds reasonable (clicky).

Many thanks in advance!

[GeoffSmith]

There isn't half some rubbish out there - your reference looks reasonably sensible and I couldn't find anything better. I did find this which is slightly off topic, but you might be interested.

[tigerdog]

Actually looks like a fun read; Chapter 4 in particular is a good primer to help understand even our Lotus' control mechanisms. I think I need more to fully appreciate his work, though.