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At first, thx for all the excellent references you are giving on many of your post.
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You are most welcome. Thanks for your contributions to the discussion too.
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I understand you point on DI vs SPI (single point injection). DI has clearly many advantage and was the panacea at the time.
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The technological advantage of DI allowed the German designs to be equal to despite strategic material shortages.
Maintaining equality with inferior materials came at a high cost though.
Exactly. The main drawback of Direct Injection is the expense and complexity. Germany is just a little smaller than the state of Montana in terms of square miles and had a strategic material shortage even before the war began.
For a resource poor country of that size to take on most of the civilized world in an all out war of attrition, complex and expensive is something to be avoided.