using a car ignition coil

[Anonymous]

Billy Ricks wrote:
1&4 and 2&3 get fire to the plugs at the same time. This actually helps burn off any residual fuel mixture before the fill stroke. They all have individual compression strokes and firing times, but they get fire at the same time every stroke.


Ok... that makes a LOT more sence. Fire at top of compression stroke AND fire at top of exhaust stroke.

Jim

Actually, firing at TDC (or near it) on every stroke has no downside. Another reason for this - in addition to Billy's quote - is that only 2 coils are required - not four. This saves weight and production costs. This is what is defined as good engineering.

[Anonymous]

Billy Ricks wrote:
1&4 and 2&3 get fire to the plugs at the same time. This actually helps burn off any residual fuel mixture before the fill stroke. They all have individual compression strokes and firing times, but they get fire at the same time every stroke.


Ok... that makes a LOT more sence. Fire at top of compression stroke AND fire at top of exhaust stroke.

Jim

Actually, firing at TDC (or near it) on every stroke has no downside. Another reason for this - in addition to Billy's quote - is that only 2 coils are required - not four. This saves weight and production costs. This is what is defined as good engineering.