20+ psi compression drop possible?
#3
Rotary Motoring
iTrader: (9)
Make sure you are cranking and holding the throttle wide open for a correct reading.
When cold the thermowax will hold the throttle plates partially open for you as well as the BAC will bypass more air and improve the reading, with the engine warmed the throttle plates will be all the way closed and the BAC will be closed down resulting in a lower compression reading.
When cold the thermowax will hold the throttle plates partially open for you as well as the BAC will bypass more air and improve the reading, with the engine warmed the throttle plates will be all the way closed and the BAC will be closed down resulting in a lower compression reading.