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| | *[http://www.crankshaftcoalition.com/wiki/Carb_vacuum_port_ID#Engine_diagnosis_using_a_vacuum_gauge '''Using a vacuum gauge'''] | | *[http://www.crankshaftcoalition.com/wiki/Carb_vacuum_port_ID#Engine_diagnosis_using_a_vacuum_gauge '''Using a vacuum gauge'''] |
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| − | ==Static CR==
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| − | [http://www.wheelspin.net/calc/calc2.html SCR]
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| − | ==Dynamic CR==
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| − | *[http://www.wallaceracing.com/dynamic-cr.php Wallace Racing DCR calculator]
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| − | *[http://www.empirenet.com/pkelley2/DynamicCR.html Kelly DCR calculator]
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| − | *[http://www.uempistons.com/calc.php?action=comp2 KB/Silvolite DCR calculator]
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| − | *[http://www.rbracing-rsr.com/comprAdvHD.htm RSR DCR calculator]
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| − | {{Note1}} Some dynamic compression rtatio calculators (like KBs) ask for an additional 15 degrees of duration be added to the IVC @ 0.050" lift point figure. This works OK on older, slower ramped cam lobes, but the faster lobe profiles may need to have 25 degrees or more added to be accurate.
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| − | {{Note1}}If the intake valve closing (IVC) point isn't known, it can be calculated:
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| − | # Divide the intake duration by 2
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| − | # Add the results to the lobe separation angle (LSA)
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| − | # Subtract any ground-in advance
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| − | # Subtract 180
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| − | This result does not need to have any amount added to the IVC point, like the KB calculator calls for.
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| − | <br><br>
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| | [[Category:Undeveloped articles]] | | [[Category:Undeveloped articles]] |
| | [[Category:Undeveloped Engine articles]] | | [[Category:Undeveloped Engine articles]] |
| | [[Category:Engine]] | | [[Category:Engine]] |
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