Fuel mixture, lean being more knock sensitive
Engine speed, lower being more knock sensitive
Higher compression is more sensitive to knock
A bigger bore is more knock sensitive
multiple spark plugs per cylinder decrease knock sensitivity
central spark plug is less knock sensitive than side mounted spark plug
aluminum cylinder heads are less knock sensitive than iron heads
colder heat range spark plugs are less knock sensitive
oil contamination in the combustion chamber increases sensitivity
swirl, and turbulence decrease knock sensitivity
quench and squish decrease sensitivity
wedge heads decrease sensitivity
supercharging increases sensitivity
inter-cooling decreases sensitivity
water and alcohol injection decreases sensitivity
insulating the underside of the manifold decreases sensitivity
blocking off the heat riser passage in an intake decreases sensitivity
Air gap intake manifolds are less sensitive
Dome pistons are more sensitive to knock than flat tops, or dished pistons