I'm no good on Japanese translation; I'm just elebroate base on the diagram only:
Diagram 1: Basicallly it says the curving of the ram pipe should be equal to maximize intake efficiciency.
Diagram 2: The longer the ram pipe the intake efficiency is better on lower rpm.
Diagram 3: Bigger to smaller diameter ram pipe will have wider coverage of intake efficiency.
You guys may try to work out some experiment base on these therory; and share with me the result too...
Please Click on the diagram for better quality photo
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