Cam and compression ratio compatibility
From Crankshaft Coalition Wiki
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==Matching cam to compression ratio== | ==Matching cam to compression ratio== | ||
Sometimes it's difficult trying to explain to fellows who are new to hot rodding that you have to match the characteristics of the camshaft to the static compression ratio of the motor along with the operating range where the cam makes power. The camshaft is not a stand-alone piece. It must be coordinated with other motor and drivetrain parts in order to arrive at a combination of parts that will all work together toward a common goal. | Sometimes it's difficult trying to explain to fellows who are new to hot rodding that you have to match the characteristics of the camshaft to the static compression ratio of the motor along with the operating range where the cam makes power. The camshaft is not a stand-alone piece. It must be coordinated with other motor and drivetrain parts in order to arrive at a combination of parts that will all work together toward a common goal. | ||
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|-bgcolor="#F1F1F1" | |-bgcolor="#F1F1F1" | ||
| align="center" |9.75:1 || align="center" |216º || align="center" |1,800-5,600 | | align="center" |9.75:1 || align="center" |216º || align="center" |1,800-5,600 | ||
| − | |- | + | |-ign="center" |3,000-6,800 |
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| align="center" |11.00:1 || align="center" |240º || align="center" |3,200-7,000 | | align="center" |11.00:1 || align="center" |240º || align="center" |3,200-7,000 | ||
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==Additional reading/engine theory== | ==Additional reading/engine theory== | ||
{{Note1}} | {{Note1}} | ||
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*[http://www.uempistons.com/calc.php?action=comp2 Dynamic compression calculator] by KB | *[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.wallaceracing.com/dynamic-cr.php Wallace Racing 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 | + | {{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 nnbfigure. 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. |
===Cam phasing=== | ===Cam phasing=== | ||
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*[[Quench]] | *[[Quench]] | ||
*[http://www.compcams.com/camquest/default.asp Comp Cams CamQuest] dyno simulation program | *[http://www.compcams.com/camquest/default.asp Comp Cams CamQuest] dyno simulation program | ||
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