Camcar part

Common camshafts are made to match typical operating characteristics and may accentuate highway cruising efficiency or low-end power. Similarly, valve “lift” refers to the height of the lobe in relation to the center of the shaft, which determines how far the valve opens. On fixed camshafts, this is not adjustable, but there are circumstances at which the engine might “breathe” better if only the valves could open a little more. Also, a fixed camshaft might open the intake valve 10° before TDC (BTDC) and close it 5° after bottom dead center (ABDC) and open the exhaust valve 15° before bottom dead center (BBDC) and close it 5° ATDC. This is referred to as valve opening duration. This works well on average but doesn’t excel in any one driving situation.

The camshaft is usually connected to the crankshaft using a timing chain or timing belt. In some pushrod engines, timing gears may also be used. The camshaft gear has twice as many teeth as the crankshaft gear, which allows it to rotate at half the speed of the crankshaft. The camshaft has four distinct strokes: intake, compression, power, and exhaust.

Where is the camshaft located

As the camshaft rotates, the cam lobes move up and down. In DOHC engines, every rotation causes a single cam lobe to push the valve down, opening it into the cylinder. Similarly, in SOHC and pushrod engines, the cam lobe pushes on the rocker arms (or pushrods then rocker arms), opening the valve. As the cam lobe rotates further, the valve spring forces the valve back up, closing it.

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Crankshaft

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All three of these problems are caused by lack of proper engine maintenance. Prevent camshaft issues by getting regular engine oil changes with a quality oil, adhering to manufacturer recommendations regarding oil change interval, oil type, and oil viscosity, and avoiding engine overheating.

On vehicles with direct fuel injection, some diesel engines, and most gasoline direct injection engines, the high-pressure fuel pump (HPFP) is driven by a lobe on one of the camshafts.

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The camshaft is critical to the basic function of an engine. Comprised of two distinct parts, the cams and the shaft, the camshaft is the element that enables valves to open. As the shaft rotates, the egg-shaped cams (or "lobes") push the valves open in sync with the crankshaft gear.

What does a CAM dosoccer

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Camshafts fitted with variable valve timing (VVT) use hydraulic actuators to advance or retard valve timing in relation to crankshaft angle. VVT enables high-speed efficiency or low-speed power.

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What does a cam dofor performance

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Using specialized variable valve lift (VVL) camshafts and computer-controlled solenoids or hydraulic actuators, the ECM can select between two valve lift options, depending on driver demand.

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What does acamshaftdo

Timing is important. Valves must open and close at specific intervals in relation to cylinder position. For example, as cylinder #1 is coming to top dead center (TDC) on the exhaust stroke, the camshaft is opening the intake valves and closing the exhaust valves. At the same time, cylinder #3 might be reaching TDC on the compression stroke, so the camshaft would leave those valves closed.

Because the camshaft is a solid steel component, it isn’t prone to wear or breakage. In most engines, other parts will wear out before the camshaft. Still, there are a few common camshaft problems that might arise.

In modern overhead-cam (OHC) engines, the camshaft is located in the cylinder head. Single OHC (SOHC) engines have one cam per bank, usually mounted between the valve stems. Rocker arms transmit SOHC movement to the valves. Dual OHC (DOHC) engines have two cams per bank, usually directly over the valve stems, one for intake valves and one for exhaust valves. Force is transmitted directly to the valve. An i4 (four-cylinder) SOHC engine has one camshaft, while a V6 or V8 SOHC engine has two. An i4 DOHC engine has two camshafts, while a V6 or V8 DOHC engine has four camshafts. Overhead-cam engines have three to five valves per cylinder, but usually two intake valves and two exhaust valves.

The typical camshaft is milled from a rough-formed cast steel blank. Some performance and custom camshafts may be milled from a solid steel block.

Older engines and a few newer “pushrod” engines have a single camshaft in the cylinder block. Long metal pushrods transmit camshaft movement to the rocker arms, which transmit that movement to the valves. Pushrod engines usually have two or three valves per cylinder, usually one intake valve and one exhaust valve.

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