When the computer hears knocking, it backs off the engine timing to fire the spark plug earlier.
Engine knocking occurs when the air-gas mixture prematurely ignites because of hot spots in the cylinder or cylinder head. Reduced EFI PowerĮngines that use electronic fuel injection (EFI) have computers that listen for the sound of engine knocking. They make a clattering noise when in operation, which increases overall engine noise. Timing chains are metal, as are the gears they drive. If the oil pressure drops significantly, the tensioners can loosen, resulting in possible chain slippage. Timing chains are held at the proper tension by oil pressure pressing on the tensioners. As with any moving part, a timing chain needs lubrication. Oil Pressure and Lubricationįor a timing chain to operate properly, the chain has to be kept at a certain tension. This reduction in initial cost to the consumer gets pushed out in time, as we'll discuss later on. This cost of manufacture reduction makes automobile manufacturers able to produce engines at a lower cost, which results in a lower cost car for the consumer. Timing chains cost more to manufacture than do timing belts. Why did car manufacturers switch from timing chains to timing belts? There are a few drawbacks to the timing chain, which we'll discuss here. This rotates the crankshaft and, through the timing belt or chain, rotates the camshaft. The crankshaft receives the power from the power strokes of the pistons. To ensure you get the maximum benefit of the camshaft's engineering, your timing belt or timing chain needs to be precisely timed with the movement of your pistons through the four strokes of your engine: intake, compression, power and exhaust.Įach valve must open and close exactly in synch with the intake and exhaust strokes for proper engine operation. In your car's engine, the camshaft is precision engineered to maximize your engine's power, reduce its emissions and provide excellent fuel efficiency. If the timing belt or chain breaks, the engine stops. If the serpentine belt breaks, the engine still runs but the accessories stop working. In later model automobiles, the manufacturers replaced this multiple-belt configuration with a single belt that powers all these accessories. Earlier automobile engines used several belts connected to crankshaft pulleys to power various automobile accessories, such as the cooling fan, alternator and air conditioning compressor. The timing chain or timing belt should not be confused with the serpentine belt. What does a timing belt vs timing chain do? Both parts perform the same function: they synchronize the rotation of your engine's camshaft with the rotation of your engine's crankshaft.
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