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One more thing. Measure all volumes so that you can figure the static compression ratio for yourself when you have finalized all your parts buying. You will need a lot of information including the exact SCR in order to intelligently choose a camshaft. All of the cam grinders have a free service where you call them up and tell them all about your build and they suggest the perfect cam for your motor. Use this service. | One more thing. Measure all volumes so that you can figure the static compression ratio for yourself when you have finalized all your parts buying. You will need a lot of information including the exact SCR in order to intelligently choose a camshaft. All of the cam grinders have a free service where you call them up and tell them all about your build and they suggest the perfect cam for your motor. Use this service. | ||
If you don't know how to figure static compression ratio or which volumes are involved, just ask me. I will be glad to explain it to you. | If you don't know how to figure static compression ratio or which volumes are involved, just ask me. I will be glad to explain it to you. | ||
| + | |||
| + | ==Static compression ratio== | ||
| + | [http://www.wheelspin.net/calc/calc2.html SCR]] | ||
| + | |||
| + | ==Dynamic compression ratio== | ||
| + | *[http://www.wallaceracing.com/dynamic-cr.php Wallace Racing DCR calculator] | ||
| + | *[http://www.empirenet.com/pkelley2/DynamicCR.html Kelly DCR calculator] | ||
| + | *[http://www.uempistons.com/calc.php?action=comp2 KB/Silvolite DCR calculator] | ||
| + | *[http://www.rbracing-rsr.com/comprAdvHD.htm RSR DCR calculator] | ||
| + | {{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. | ||
| + | |||
| + | {{Note1}}If the intake valve closing (IVC) point isn't known, it can be calculated: | ||
| + | # Divide the intake duration by 2 | ||
| + | # Add the results to the lobe separation angle (LSA) | ||
| + | # Subtract any ground-in advance | ||
| + | # Subtract 180 | ||
| + | This result does not need to have any amount added to the IVC point, like the KB calculator calls for.*[http://www.wallaceracing.com/dynamic-cr.php Wallace Racing DCR calculator] | ||
| + | *[http://www.empirenet.com/pkelley2/DynamicCR.html Kelly DCR calculator] | ||
| + | *[http://www.uempistons.com/calc.php?action=comp2 KB/Silvolite DCR calculator] | ||
| + | *[http://www.rbracing-rsr.com/comprAdvHD.htm RSR DCR calculator] | ||
| + | {{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. | ||
| + | |||
| + | {{Note1}}If the intake valve closing (IVC) point isn't known, it can be calculated: | ||
| + | # Divide the intake duration by 2 | ||
| + | # Add the results to the lobe separation angle (LSA) | ||
| + | # Subtract any ground-in advance | ||
| + | # Subtract 180 | ||
| + | This result does not need to have any amount added to the IVC point, like the KB calculator calls for. | ||
==References== | ==References== | ||
*[[Quench]] | *[[Quench]] | ||
| − | + | <br><br> | |
[[Category:Undeveloped articles]] | [[Category:Undeveloped articles]] | ||
[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Undeveloped Engine articles]] | [[Category:Undeveloped Engine articles]] | ||
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