Malesbaca.com – Camshaft Types, or commonly known as Noken As, are essential components in the engine system, especially in managing the opening and closing of valves. The camshaft is a cylindrical rod with lobes (cams) that push the valves open, either directly or through intermediary mechanisms like a rocker arm.
This component plays a crucial role in controlling the engine’s combustion cycle. Terms like lift, overlap, and duration often come up when discussing camshaft modifications or tuning, especially among mechanics or automotive enthusiasts who enjoy engine tweaking.
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How Camshaft (Noken As) Works
The camshaft operates the intake and exhaust valves alternately, following the engine’s operating cycle. The lobes on the camshaft press against the valve to open it according to a predetermined sequence, and the valve closes again due to the spring pressure.
1. Lift
Lift refers to the height of the cam lobe, which determines how far the valve opens. The higher the lift, the more air or fuel can enter or exit the combustion chamber.
2. Overlap
Overlap happens when both the intake and exhaust valves are open at the same time. This occurs at the end of the exhaust stroke and the beginning of the intake stroke. Overlap affects the scavenging efficiency, particularly in high-performance engines.
3. Duration
Duration refers to how long a valve remains open, measured in crankshaft degrees. The longer the duration, the longer the valve stays open to allow the air/fuel mixture in or exhaust gases out.
Camshaft modifications are usually done by machining or grinding the cam to achieve the desired lift and duration—especially for racing needs. However, many racing camshafts with specific specifications are now available in the market, so users no longer need to modify them manually.
Types of Camshaft (Noken As)
In general, camshafts are categorized into two main types: standard camshafts and racing camshafts. Each has different characteristics and is designed for specific uses.
1. Standard (Factory) Camshaft
This is the stock camshaft provided by the manufacturer, designed for daily use with an emphasis on efficiency and reliability. It is usually unsuitable for high-performance engines because its characteristics are limited to factory settings.
2. Racing Camshaft
Specially designed to enhance engine performance in race-tuned or heavily modified motorcycles. Racing camshafts have higher lift and longer duration, which enables increased engine power output. Some popular racing camshaft brands include:
- Kawahara
- TDR
- Marathon
- CLD
- HRP (Hendriyansyah Racing Product)
Racing camshafts are ideal for users seeking performance upgrades without the hassle of designing their own camshaft profile.
