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| techtalk:evo:engmech02e [2025/09/16 18:23] – [TDC Lift and Overlap] hippysmack | techtalk:evo:engmech02e [2025/09/16 18:28] (current) – [TDC Lift and Overlap] hippysmack | ||
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| ====== TDC Lift and Overlap ====== | ====== TDC Lift and Overlap ====== | ||
| At piston overlap TDC (exhaust stroke), the cams are positioned such that both valves are slightly open. | At piston overlap TDC (exhaust stroke), the cams are positioned such that both valves are slightly open. | ||
| - | The operative cam spec is the "TDC Lift" for both the intake and exhaust valve. That's how much the valves are open at top dead center between the exhaust and intake strokes, which is the overlap period (the exhaust cycle is ending as the intake cycle begins, and the two cycles overlap each other). \\ | + | The operative cam spec is the "TDC Lift" for both the intake and exhaust valve. That's how much the valves are open at top dead center between the exhaust and intake strokes, which is the overlap period (the exhaust cycle is ending as the intake cycle begins, and the two cycles overlap each other). |
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