Question about Knock
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Heel & Toe
Joined: Feb 2008
Posts: 16
Likes: 3
From: GardenGrove CA
The 1987 Porsche 944 Turbo had individual cylinder knock control. The ignition was distributor and single coil.
Make the spark, listen for knock. If knock, it HAD to come from the cylinder that just fired.
Two revolutions later, when THAT cylinder is ready to fire again, software dials in the calculated knock retard for THAT cylinder.
Software keeps track of the individual retard values for each cylinder and applies them when the corresponding cylinder is about to fire.
Make the spark, listen for knock. If knock, it HAD to come from the cylinder that just fired.
Two revolutions later, when THAT cylinder is ready to fire again, software dials in the calculated knock retard for THAT cylinder.
Software keeps track of the individual retard values for each cylinder and applies them when the corresponding cylinder is about to fire.
