Thus flywheels help ensure consistent power delivery in single cylinder engine. But multi cylinder engines can be timed to have consistent power delivery; yet still we have flywheels in those engine. But why? In multi cylinder engine they are used to control engine vibration; balance crankshaft; ensure proper running direction and crank engine when required. Multi-cylinder engines have even output torque and thus require smaller light flywheels; that add up to engine acceleration.
The turning moment of a four stroke engine for different position of crank is only positive for the power stroke. As we have discussed earlier; an I.
C engine produce power only during the power stroke. From the turning moment diagram we can see that; during suction there is negative turning moment due to cylinder pressure less than 1 atmosphere. Similarly energy is taken from the crankshaft and flywheel to do work on the gases; which results into a much higher negative turning moment. Then during the power stroke we see a surge in positive turning moment; due to the expending flue gas pressure. While during the exhaust stroke flue gas are released by working onto the gas; resulting into a negative turning moment.
So there is this extra torque generated during the power stroke; which need to be stored and then released using the flywheels. Now since during the suction, compression and exhaust stroke; energy is taken from the flywheel; and added during the power stroke. A flywheel can be little handy determining the running direction of an engine. You can simply tell which way the engine is rotating; giving a look at the engine flywheels. When looked from the flywheel end; if it rotates clockwise then the engine is a right hand type.
Similarly if the flywheel rotate anticlockwise in an engine its a left hand type. In multi cylinder heavy engine such as in industries and ship; these flywheels can also be used to determine piston position in cylinder. Using the cylinder markings on the flywheel you can know in which cylinder the piston is at T.
This can then be used to determine firing order of an engine. If the engine is stopped for long and need to be purged; these flywheels come really handy. To purge an engine you need to rotate the flywheel either manually or through a motor with indicator cock open. Although an engine can rotate in both clockwise or counter clockwise direction; but generally most engine rotates in counter clockwise direction.
So you must always knew the correct running direction of an engine; either through the engine manual or visually inspecting its flywheel. Ans: You might have read in many manuals or on web that this flywheel is made of cast iron or Grey cast iron. It may arose doubts whether all flywheels are made of cast iron or at least most of them. In fact a flywheel can be made from different material; depending upon the application.
Very small flywheels as such in toys are made mostly from lead. Medium or small flywheels can be of cast iron, aluminum or steel. But the big flywheels are made of cast iron or high strength steel depending upon the needs of the design.
Ans: Not all flywheels have teeth but most flywheel on cars, motorcycles, heavy generators and ships have teeth; but why? If you had or have a motorcycle you must known how we need to kick or self start to run the engine.
What actually it does is that it rotate the flywheel through a small gear attached to the flywheel teeth.
In large diesel engine such as in ship where compressed air is used crank or start the engine; these flywheel teeth are used for high pressure fuel and servo oil pump. Ans: Both flywheel and a governor is used to regulate engine speed; but in a different way. On one hand flywheel regulates the speed of an engine over different strokes; to keep its mean speed constant. But a governor is used to regulate the mean speed of the engine for variable load.
This is achieved by adjusting fuel injection to meet increased power demand. After the engine starts, the Bendix gear withdraws to let the flywheel spin freely. Once the engine has started, the crankshaft converts the up-and-down movement of the pistons into rotary motion.
Nonetheless, this motion is jerky as power is generated only twice for a four-cylinder engine or four times for an eight-cylinder during one engine revolution. The mass of the flywheel applies inertia to keep the engine crankshaft turning between each of these piston firings, so the rotation speed of the crankshaft is kept constant and the engine runs smoothly. Since the pistons are offset from the center of the crankshaft, the engine consequently vibrates and wobbles as each piston fires at a different angle.
The heavy weight of the flywheel suppresses this side-to-side motion, helping to stabilize and balance the engine on its mounts and reduce vibration throughout the vehicle. Although the engine and the transmission shafts are parallel to each other, the attachments between the axle and the transmission are not; the driveshaft uses universal joints that constantly change angles as they turn.
Flywheels help reduce the wear on such joints. This smell is generated when the clutch is being used improperly, whether from a bad flywheel or an inexperienced driver. The facings of the clutch produce a lot of heat due to friction from improper use which essentially makes the surface to glaze over from the heat. The consequence is a strong pungent, acrid smell that can become quite noticeable. The clutch repeatedly grabs and releases which feels like a stutter or vibration when the clutch is released.
While a warped flywheel is sometimes the cause, clutch chatter can be difficult to diagnose as pressure plate, the clutch disc, or release bearing are often at fault whether the parts are worn, broken, warped, or contaminated by oil due to an engine or transmission leak. Often, as you try to change gears while driving, the gears may slip.
This typically happens when you can tell no power is being transferred to the wheels. This is often a direct result of a worn clutch. The slipping clutch will eventually cause the flywheel to wear out as well.
You may start to hear grinding noises from the pressure plate and eventually, the flywheel other parts in the clutch assembly will overheat and cause them to warp or even crack.
This is opposite to a clutch slipping. It is the bearing or bushing in the flywheel or crankshaft assembly. Along with this, there can be vibrations coming from the clutch pedal or floor of your vehicle each time you operate the clutch.
As you may know, the spring mechanism normally reduces the vibrations that are generated from the clutch being used. Driving Tips. Maintenance Tips. Car Review. Car Comparison. Industry knowledge. How Does A Flywheel Work? Last updated Mar 01, It serves many purposes: On a manual transmission car, it gives one of the friction surfaces for the clutch.
The clutch pressure plate is bolted to it and the clutch disk is sandwiched between them. On an automatic transmission car, it is actually known as a flex plate and the torque converter of the transmission bolts to it. Follow These Steps! It mainly serves these functions in most vehicles: 1. Engine Speed Smoothing Once the engine has started, the crankshaft converts the up-and-down movement of the pistons into rotary motion.
Flywheel does some specific functions in a car. Source: Youtube 3. Engine Balancing Since the pistons are offset from the center of the crankshaft, the engine consequently vibrates and wobbles as each piston fires at a different angle.
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