How to choose a camshaft
(→Wider LSA:) |
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====Narrower LSA:==== | ====Narrower LSA:==== | ||
A narrower LSA will ''increase'' overlap. This has a tendency to reduce engine output at lower RPM and increase engine output at higher RPM. A narrower LSA tend to make more peak power but a little less average power. | A narrower LSA will ''increase'' overlap. This has a tendency to reduce engine output at lower RPM and increase engine output at higher RPM. A narrower LSA tend to make more peak power but a little less average power. | ||
| − | *Moves torque to | + | *Moves torque to lower RPM |
*Increases maximum torque | *Increases maximum torque | ||
*Narrow power band | *Narrow power band | ||
| − | * | + | *Builds higher cylinder pressure |
| − | * | + | *Increase chance of engine knock |
| − | * | + | *Increase cranking compression |
| + | *Increase effective compression | ||
*Idle vacuum is reduced | *Idle vacuum is reduced | ||
*Idle quality suffers | *Idle quality suffers | ||
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====Wider LSA:==== | ====Wider LSA:==== | ||
A wider LSA tend to make less peak power, but a broader powerband. Changing the LSA also changes the valve timing events; opening the exhaust valve sooner and closing the intake valve later, both of which affect how the engine ingests air. | A wider LSA tend to make less peak power, but a broader powerband. Changing the LSA also changes the valve timing events; opening the exhaust valve sooner and closing the intake valve later, both of which affect how the engine ingests air. | ||
| − | *Raise torque to | + | *Raise torque to higher RPM |
*Reduces maximum torque | *Reduces maximum torque | ||
*Broadens power band | *Broadens power band | ||
| − | * | + | *Reduce maximum cylinder pressure |
| − | * | + | *Decrease chance of engine knock |
| − | * | + | *Decrease cranking compression |
| + | *Decrease effective compression | ||
*Idle vacuum is increased | *Idle vacuum is increased | ||
*Idle quality improves | *Idle quality improves | ||
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