Dynamic compression ratio
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| + | ==Online calculators== | ||
| + | *[http://www.wheelspin.net/calc/calc2.html SCR calculator] | ||
| + | *[http://www.wallaceracing.com/dynamic-cr.php Wallace Racing DCR calculator] | ||
| + | *[http://www.empirenet.com/pkelley2/DynamicCR.html Kelly DCR calculator] | ||
| + | *[http://www.kb-silvolite.com/calc.php?action=comp2 KB/Silvolite DCR calculator] | ||
| + | If the intake closing (IC) point isn't known, it can be calculated by dividing the intake duration by 2, add that to the lobe separation angle (LSA). Then subtract any ground-in advance. Finally, subtract 180. This result does not need to have any amount added, like the KB calculator calls for. | ||
| + | DCR and pump gasoline== | ||
| + | It's worth mentioning that 8.5:1 DCR is considered to be the maximum for iron heads and 92 octane fuel (MON + RON divided by 2). | ||
| + | SCR vs. DCR vs. duration== | ||
The following are different static compression ratios (SCR) with a 3.48" stroke and different camshaft intake closing points @ 0.050" tappet lift on Keith Black's dynamic compression ratio calculator. The calculator, starting at 8.25:1 SCR. The dynamic compression ratio (DCR) has been kept at just over 8.0:1, a figure that is acceptable for use with today's pump gas with a little cushion: | The following are different static compression ratios (SCR) with a 3.48" stroke and different camshaft intake closing points @ 0.050" tappet lift on Keith Black's dynamic compression ratio calculator. The calculator, starting at 8.25:1 SCR. The dynamic compression ratio (DCR) has been kept at just over 8.0:1, a figure that is acceptable for use with today's pump gas with a little cushion: | ||
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