Quote:
Originally Posted by ConnClark
However, at higher rpms your power and torque drops off due to a drop in volumetric efficiency and prechamber design not to mention the governor cutting back on fuel. The OM617 just wasn't designed to generate optimal power at these rpms because it didn't need to. You might be able to improve on volumetric efficiency with a custom cam and porting the heads. You can also adjust the governor to get more fuel at higher rpms, but redesigning the prechamber is going to be a lot of trial and error.
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I think you can redesign forever but cannot overcome the limitations of the burn rate for diesel fuel. It takes a certain amount of time for the flame to propagate and once you get over 3800 rpm or so............torque starts falling off in a big hurry.