Block deck height
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If you have an engine other than a small block Chevy, you need to find the main bearing bore of the motor or snug a cap onto the saddle without a bearing and measure the diameter, then divide that figure in half for the radius. The remainder of the calculations are exactly the same as stated above for the SBC. | If you have an engine other than a small block Chevy, you need to find the main bearing bore of the motor or snug a cap onto the saddle without a bearing and measure the diameter, then divide that figure in half for the radius. The remainder of the calculations are exactly the same as stated above for the SBC. | ||
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| + | ==Compression ratio calculators== | ||
| + | ===Static CR=== | ||
| + | *[http://www.wheelspin.net/calc/calc2.html SCR] | ||
| + | |||
| + | ===Dynamic CR=== | ||
| + | *[http://www.empirenet.com/pkelley2/DynamicCR.html Dynamic compression calculator] by Kelly | ||
| + | *[http://www.uempistons.com/calc.php?action=comp2 Dynamic compression calculator] by KB | ||
| + | *[http://www.wallaceracing.com/dynamic-cr.php Wallace Racing DCR calculator] | ||
| + | *[http://www.rbracing-rsr.com/comprAdvHD.htm RSR DCR calculator] | ||
| + | {{Note1}} Some dynamic compression ratio 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.<br> | ||
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| + | {{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. | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
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