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Basically the best you can do is to make sure your engine is as close to stock as possible.
What is really restricting your high rpms is the length of your stroke...
which of course is that gives you your compression ratio.....
For high rpms engines are designed as ' over square' meaning the surface area of the piston is bigger than the length of the stroke... plus those engines are subject to increasing the fuel supply , wasting fuel , in exchange for more power..
A Diesel MUST have excess oxygen to function properly... so unless the amount of air provided is increased along with any fuel increase you will not get extra power..
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