[Blowby]

Injection Timing= when during the exhaust/compression stroke do we start putting fuel in the cylinder

When is the right time you ask? Let me ask what type of delivery system are you going to use, I mean in detail, since the delivery of fuel will control the point in time enough fuel enters the chamber to start ignition, the delivery system of fuel and oxygen will control the burn rate (time to complete) and the delivery system of fuel and oxygen will dictate the type of pressure and heat created in the combustion chamber to generate mechanical force on the piston and crank.