Editing Dynamic compression ratio
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{{Note1}}If the intake valve closing (IVC) point isn't known, it can be calculated: | {{Note1}}If the intake valve closing (IVC) point isn't known, it can be calculated: | ||
− | # Divide the | + | # Divide the intake duration by 2 |
# Add the results to the lobe separation angle (LSA) | # Add the results to the lobe separation angle (LSA) | ||
# Subtract any ground-in advance | # Subtract any ground-in advance | ||
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{{Note1}} Disclaimer<br> | {{Note1}} Disclaimer<br> | ||
− | + | Now, it's unclear where these Keith Black DCR calculator dynamic compression ratio readings are taken; at cranking rpm or at max efficiency rpm. According to the DynoSim software, maximum cylinder pressure is made at or near the torque peak. So, the fact that a motor is not detonating at low rpm does not mean that it will not detonate at, or close to, the torque peak. | |
These numbers may not mean anything at all, but they do illustrate that you cannot just pick a cam out of thin air like a lot of fellows do and expect it to work best for your particular combination. | These numbers may not mean anything at all, but they do illustrate that you cannot just pick a cam out of thin air like a lot of fellows do and expect it to work best for your particular combination. |