Dynamic compression ratio
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==Online calculators== | ==Online calculators== | ||
===Static CR=== | ===Static CR=== | ||
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*12.00.......68............8.017........................................................................................................ | *12.00.......68............8.017........................................................................................................ | ||
| − | + | {{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. | 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. | ||
| + | ==Beyond DCR== | ||
| + | There is a limit to what DCR can do. Other concepts have been developed that take this a step (or several steps) further than what DCR is able to accomplish. | ||
| + | *[http://victorylibrary.com/mopar/cam-tech-c.htm#factor Cam Timing vs. Compression Analysis] is an "advanced" formula for looking at the relationship of SCR vs. DCR. In the text the author uses "'''''supra'''''" a lot, it basically means "more info above". | ||
| + | *[http://horsepowerchain.com/ The Horsepower Chain] attempts to put things into a mathematical prospective, and breaks the 4-stroke engine's cycles into 7 distinct segments. | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Cylinder head]] | [[Category:Cylinder head]] | ||
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