PVDF Sensors would prove it one way or another
Hmm if you are really interested in seeing if the engine is smoother or not, there are these cheap flat mylar-enclosed piezo electric strips called PVDF's that are used as AC "strain gages" in that they show vibration and pressure changes but not actual pressure. They produce their own excitation and signal voltage simply from movement and need no bias current. Tape one end to the motor mount and the other to the engine with a little bend in between and read directly with a scope (measuring the amplitude and F of the AC spikes of the PVDF's output signal), with the copper coil installed and without, and it would quickly tell you for sure if the engine is smoother or not.
My old Customers used these in the past to measure large electric motor and drive vibrations, and even to record the shock and vibration on crates or boxes being transported by truck or rail. They are worthless for measuring direct / absolute pressures (being AC coupled), but they are cool little toys nonetheless Their output is usually several volts (ive seen them put out as much as 15V).
Here's just one place to get them: Ktech's Applied Physics - PVDF Shock Sensors
Hmm if you are really interested in seeing if the engine is smoother or not, there are these cheap flat mylar-enclosed piezo electric strips called PVDF's that are used as AC "strain gages" in that they show vibration and pressure changes but not actual pressure. They produce their own excitation and signal voltage simply from movement and need no bias current. Tape one end to the motor mount and the other to the engine with a little bend in between and read directly with a scope (measuring the amplitude and F of the AC spikes of the PVDF's output signal), with the copper coil installed and without, and it would quickly tell you for sure if the engine is smoother or not.
My old Customers used these in the past to measure large electric motor and drive vibrations, and even to record the shock and vibration on crates or boxes being transported by truck or rail. They are worthless for measuring direct / absolute pressures (being AC coupled), but they are cool little toys nonetheless Their output is usually several volts (ive seen them put out as much as 15V).
Here's just one place to get them: Ktech's Applied Physics - PVDF Shock Sensors
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