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Left is 4.0, right is 4.2 (AJ34 vs 4.4 AJ41). The sharper ramp profile made more power, suggesting faster valve acceleration can outweigh longer duration in this case.
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steve_k_xk April 4, 2026
Left is 4.0, right is 4.2 (AJ34 vs 4.4 AJ41). The sharper ramp profile made more power, suggesting faster valve acceleration can outweigh longer duration in this case.

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