you have to realize that in addition to the firing pulses 17 times a second you have 17 vacuum phases as well. You would have to use a check valve in the gauge like a compression testing gauge to eliminate the effect of the vacuum I don't know where you would get a dual spark plug engine. You still haven't said at what point in the power curve you are trying to measure. Like I said anyone who has studied thermodynamics can figure this stuff out without ever running the engine. You must know someone who has studied thermodynamics, or go to a college many professors would be happy to show off their knowledge. It is beyond my education, but lots of people can figure it out it is fairly straightforward physics. It is the same math they use to design engines, maybe call the design dept at general motors, they could probably use some positive PR about now.
