Cam and compression ratio compatibility
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| + | ==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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<blockquote>With too much compression ratio (or too little duration) the cylinder pressure will be too high, causing pre-ignition and detonation. This condition could severely damage engine components.</blockquote> | <blockquote>With too much compression ratio (or too little duration) the cylinder pressure will be too high, causing pre-ignition and detonation. This condition could severely damage engine components.</blockquote> | ||
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| − | !Static Compression Ratio (SCR) !!Intake Valve Duration (degrees @ .050" lift) !!Power Range (RPM) | + | !Static Compression Ratio<br> (SCR) !!Intake Valve Duration<br>(degrees @ .050" lift) !!Power Range<br> (RPM) |
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| − | | align=" | + | | align="center" |8.00:1 || align="center" |185º || align="center" |Idle-4,000 |
| + | |-bgcolor="#F1F1F1" | ||
| + | | align="center" |8.25:1 || align="center" |189º || align="center" |Idle-4300 | ||
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| − | | align=" | + | | align="center" |8.50:1 || align="center" |194º || align="center" |800-4,500 |
| + | |-bgcolor="#F1F1F1" | ||
| + | | align="center" |8.75:1 || align="center" |200º || align="center" |900-4,600 | ||
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| − | | align=" | + | | align="center" |9.00:1 || align="center" |204º || align="center" |1,000-4,600 |
| + | |-bgcolor="#F1F1F1" | ||
| + | | align="center" |9.25:1 || align="center" |208º || align="center" |1,200-5,200 | ||
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| − | | align=" | + | | align="center" |9.50:1 || align="center" |212º || align="center" |1,600-5,400 |
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| + | | align="center" |9.75:1 || align="center" |216º || align="center" |1,800-5,600 | ||
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| − | | align=" | + | | align="center" |10.00:1 || align="center" |221º || align="center" |2,000-5,800 |
| + | |-bgcolor="#F1F1F1" | ||
| + | | align="center" |10.25:1 || align="center" |227º || align="center" |2,400-6,200 | ||
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| − | | align=" | + | | align="center" |10.50:1 || align="center" |233º || align="center" |2,800-6,400 |
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| + | | align="center" |10.75:1 || align="center" |236º || align="center" |3,000-6,800 | ||
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| − | | align=" | + | | align="center" |11.00:1 || align="center" |240º || align="center" |3,200-7,000 |
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| + | | align="center" |11.50:1 || align="center" |244º || align="center" |3,400-7,200 | ||
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| − | | align=" | + | | align="center" |12.00:1 || align="center" |248º || align="center" |3,600-7,400 |
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==Additional reading/engine theory== | ==Additional reading/engine theory== | ||
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