I run the single spark SH on my R90S (left) and the later triple spark on my R80G/S (right): http://i44.photobucket.com/albums/f13/R90S/taillightbracket024.jpg Both engines are thoroughly modified. Both ignition systems work very well. I don't think you can get a single spark system from SH anymore,...
Right, when the number of gas molecules is no longer being changed. In other words, when it goes back to a static state. But when the manometer is in use, it is measuring a dynamic state. Instead of arguing from your desk, put up some formulas to prove your assumption and test it with your equipment.
Yes, that is why the level of the liquids in each column evens out when that vacuum stops changing. But while the vacuum is changing, in equal value to each tube length, the effect of different lengths of tube is shown by the movement of the levels - short tube length rises, long tube length drops. ...