The part of the signal that is ramp upward is the intake stroke of the engine. The part of the signal that ramps down is the compression, power and exhaust stroke combined.

 

Inside the circle on the left is the vacuum signal from the intake stroke and this is the only part of the vacuum that has to do with the synchronization of carburetors. The rest of the signal inside the circle on the right is about the air intake system and its ability to breath and recover from the intake stroke and be ready for the next cycle.

 

 

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