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Message: [QUOTE="Charles, post: 142091, member: 103"] The point of timing is to have the rapidly increasing combustion pressure act on the piston at it's most advantageous positions. If the injection event commenced with zero delay you would still be required to increase timing with increased rpm due to the time required for the combustion pressure to build, peak and fall vs the position of the ever increasing piston sweep velocity. What you are describing is the equivalent of a mechanical advance. Just like what you see in a Sigma pump for instance, or any variable timed engine. It is based on a need to accomodate a flame front propogation of a given duration with respect to a piston cycle with a varying period. The combustion must commence sooner relative to the piston cycle as the period between cycles decreases. Even if you set the injection offset table to zero, you would still have to increase the SOI with increased operating rpm even with an injector that had 0.00ms of lag in order to maintain the same cylinder pressure peak relative to TDC. Or conversely, you would have to reduce the SOI as rpm fell in order to keep the rods [i]inside[/i] the block. [/QUOTE]

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