How to choose a camshaft
m (→Custom cam) |
m (→Duration: Minor clean up) |
||
| Line 41: | Line 41: | ||
*Less duration is best for: heavier cars, tow vehicles, higher rear axle gearing (lower numerically), lower stall converters, smaller head ports and flow, lower compression (to prevent too much cylinder pressures during cranking) and higher transmission gearing. | *Less duration is best for: heavier cars, tow vehicles, higher rear axle gearing (lower numerically), lower stall converters, smaller head ports and flow, lower compression (to prevent too much cylinder pressures during cranking) and higher transmission gearing. | ||
| + | ====Calculating duration==== | ||
If the duration is not stated on the cam card, it can be easily calculated by adding the intake opening point in degrees to the exhaust closing point. | If the duration is not stated on the cam card, it can be easily calculated by adding the intake opening point in degrees to the exhaust closing point. | ||
| − | If those points are not | + | If those points are not known, you can estimate the duration by using the advertised duration and the lobe separation angle: |
#Add the intake and exhaust advertised durations, then | #Add the intake and exhaust advertised durations, then | ||
#divide the results by 4, then | #divide the results by 4, then | ||
#subtract the lobe separation angle, then | #subtract the lobe separation angle, then | ||
| − | #multiply the results by 2 | + | #multiply the results by 2 |
===LSA=== | ===LSA=== | ||
Your Privacy Choices