The Ghiblis'4.7 litre motor was tuned to give 335 bhp in SS form, whilst the 310 bhp Bora was tuned for a smoother power delivery but more initial ignition advance gave it more power lower in the rev range.
12.
The signal to pin 44 and ion current in the combustion chamber is related to each other, when this signal reaches a certain level the ECU interprets this as a knocking event and firstly lowering the ignition advance by 1, 5?on this cylinder.
13.
This manifold vacuum can be substantial, and can be used as a source of automobile ancillary power to drive auxiliary systems : power assisted brakes, emission control devices, cruise control, ignition advance, windshield wipers, power windows, ventilation system valves, etc.
14.
Lighter weights or heavier springs can be used to reduce the timing advance at lower engine RPM . Heavier weights or lighter springs can be used to advance the timing at lower engine RPM . Usually, at some point in the engine's RPM range, these weights contact their travel limits, and the amount of centrifugal ignition advance is then fixed above that rpm.
