Engineering Report
Contents
Introduction p1
What is a Two Stroke Engine? P2
How a Two-Stroke Engine Works
Power Stroke p3
Fuel Intake p4
Compression stroke p5
Dismantling the Engine p
Engine Assessment p
Engine Rebuild p
Appendices
Introduction
The task at hand was to find a medium sized internal combustion engine. With this engine we had to dismantle it recording all the steps taken to pull it down. After the engine had been taken apart, all the functions of the engine had to be observed and recorded. After observing and recording all the information, it was then required to make any minor repairs, adjustments or replacements. Once the repairs had been carried out, the engine had to be rebuilt back to its original or better then working condition.
What is a Two-Stroke Engine?
A two-stroke engine is an engine that is mainly used in lower-power devices. Two stroke engines are used in devices such as jet skis, dirt bikes, lawn mowers and other petrol powered garden equipment such as whipper snippers, chainsaws and leaf blowers. Two-stroke engines are renowned and used for their simplistic design. Without having valves it reduces weight and reduces complexity of its design. The engine can function in any orientation. This means that it can be moved upside down, around in any direction without the engine stopping. This has a massive advantage over four stroke engines because they need to stay upright for the oil flow to remain constant.
Two stroke engines have the ability to create a lot of power because of the amount of power strokes per revolution, in addition with its small lightweight design; two stroke engines have a high power-to-weight ratio.
Fig 1) Cross section of a two-stroke engine's barrel and crank case.
How a Two-Stroke Engine Works
Power Stroke
Starting from the point where the spark plug fires. Previous to this, the piston has compressed the fuel/air mixture in the cylinder. When the spark plug fires, it creates an explosion. This explosion drives the piston downward which turns the crankshaft, which is attached to the shaft that drives the cutting deck on the lawn mower. As this is happening it is compressing the fuel/air mixture that has come from the carburetor, in the crank case. As the piston starts to go down, the exhaust port is uncovered, and the pressure in the cylinder forces most of the exhaust gases out of the chamber.
Fig 2) The power stroke in a cross section of a two-stroke engine.
Fuel Intake
Perhaps the smallest step in the combustion process, but one of the most important. As the piston reaches its most downward point, the piston has pressured the fuel/air mixture in the crankcase.
...e fuel and air and then again the sparkplug provides a spark igniting the mixer creating the power stroke sending the piston back down restarting the cycle. This engine has a lot more compression and just takes straight gas and air. With a the oil being completely separated from the gas. This engine was a lot more reliable because it didn’t spin as fast and never got as hot it lasted a lot longer and barely ever need rebuilt. Just maintain like new oil, coolant, and a new spark plug was about all it took to keep these bike running and because they weren’t rebuilt between each race the bike would be no different than the one they had raced in the previous race thus keep the rider more comfortable and more in control of the power of the bike. This lead to faster lap times more safe bikes and in the end a whole new style of racing for the world of Supercross.
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...the shock waves created by a shift, which acts as a brake, slowing the turbo and requiring it to be spooled up again. We lose boost pressure but keep our turbo speed this way.
This hot gas is pushed out through the back and it makes the rocket move forward. This is using Newton's third law of
The basic trimmer works by the engine driving a multi-bearing supported hardened steel shaft housed in an aluminium tube through a centrifugal clutch this shaft is connected to a “head” that holds a nylon line that spun at high revolutions per minute (RPM). This nylon line then cuts the grass by hitting the blades of grass at high speed, this cause the grass to be severed at the point of impact. Thus trimming the grass.
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The Physics Behind the Power of an Engine Insert the key, turn, and vroom. And down the road you go. Most people take for granted the strange conglomeration of metal and plastic under that sheet of metal, either in front or back of their vehicle. The engine, as you may have guessed, is a modern marvel- so to speak. They’re found in cars, trucks, boats, airplanes.
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Knowing how to take apart machinery, and put it back together exactly the way it was before, is a big part of this job. Let us say we are both industrial machinery mechanics I am your employee and I thought I fixed a front-end loader for a mine. I took it apart ran some tests on the engine I diagnosed the problem the oil filter was plugged up. I then took apart off the hood found the oil filter
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Sirignano, W. A., & Liu, F. (1999). Performance increase for gas-turbine engine through combustion inside the turbine. Journal of Propulsion and Power, 15(1), 111-118.
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