Group 28 gate 1

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Gate 1 is the begining of the dissection process of the pressure washer engine. It begins with establishing roles for all of the members and an outline of how this project will be completed. The initial assessment of the pressure washer is also included on this page.

The home page for this group is below:


Work Proposal

Our group has developed a plan in cooperation with Group 27 to dissect the pressure washer. We have decided to dissect the engine while the other group will be dissecting the compressor unit. Our disassembly will be completed by October 14th.

Project Approach

• The dissection process will first involve removing the engine and compressor units from the frame. This will require the use of a ratchet and assorted socket sizes.

• Then the compressor unit will be removed from the motor so that the two groups can begin their individual work.

• To begin dissection of the engine we will first remove all of the main components such as the air intake system, the gas tank, and the carburetor. The removal of these items will once again rely on a ratchet and socket set as well as assorted screwdrivers.

• Next we will begin the dissection of the actual engine. The inside of the engine will be much more complex than the previous steps and will take much more time in order to keep track of everything. We will strip down the engine and examine the valve train, the piston/cylinder and the crank. All of these components will be stripped down to their individual parts and documented.

The dissection will be documented fully with pictures being taken of each component that is removed from the engine. The documentation and pictures will come in handy later not only with the report but also in reassembling the engine. The disassembly process should only take a few hours to complete while members of the group record the steps. Updating the wiki for the gates will take 1 to 2 hours for formatting and organization of data for each section. The reassembly process should take only under 2.5 hours as the group will be very familiar with working with each other and the engine.

Tools Required

Being a complex dissection it is difficult to discern exactly what tools will be needed, however we can assume that we will need at least the following: Ratchet
Socket set
Screwdriver set- both Phillips and flat head
Wrench set
Assorted pliers

Group Capabilities

Strengths Group 28 is a diverse group of students that have different abilities to bring to this project. Jack has extensive work with dissection processes, having worked for years with jet skis. Dylan has worked with wikipedia pages before and is willing to learn more about it. Dan has great leadership experience as president of his high school's National Honor Society. Kyle is enthusiastic about this project and has great editing skills. Tim is member of SAE and rides dirt bikes in tournaments around the country, this gives him valuable knowledge on engines and there functions.


An overall weakness is that few members of the group have extensive knowledge of Solid Works, the CAD software used to make drawings of the componets. This might slow the group down as a learning curve exists. The group is worried about procrastination, but is motivated to work hard.

Management Proposal

We have spent a considerable amount of time preparing for the reverse engineering project that has been presented to us. We have discussed many of the problems that our group will most likely run into, most of which can be solved with proper time management. As a group we have determined the priority of all steps in the process and in the specific order that we wish to complete them in so that we can achieve success in our project. Looking through the gates we have established a meaningful timeline of when we expect all of our work to be completed, always leaving time to correct any errors before the deadlines. This information can be found to the below in .jpg format dipicting Gantt charts in the three stages of our project. Also all the times we plan on meeting to asses our progress through this project is available. Overall we believe that if we follow our initial timeline we should have no trouble meeting all of our goals and successfully complete this project.

If there is an issue with members of the group not participating and after several attempts to include this person, then the group member will no longer recieve credit for the phase they refused to aid in. The group does not see this as being an issue as all members apear motivated to success.

Stage 1 Stage 2 Stage 3 Meeting Schedule
Stage 1 of Project
Stage 2 of Project
Stage 3 of Project
Meeting Times

Project Personnel

We have assigned the group roles to divide the work more effectively as follows.

Project Lead Daniel Reilly Main

Dan is going to be the main point of contact for this project as Project Lead. His email is. As project lead his responsibilities will be to make sure the group has a direction in the project and that the established deadlines can be met effectively. Dan will have to acknowledge that certain parts of the initial proposal may need to be altered as the project moves forward and that changes may be needed to insure success in the project. Dan will be a part of every process in the project and will need to make sure everyone gets assistance in any step they are having difficulties with, such as updating the wiki page or contacting a teaching assistant with questions about a gate requirement.

Information Specialist Dylan Conway

The Information Specialist, Dylan, is going to primarily handle all wiki related tasks. Dylan assumed the role because he was the most familiar with the editing of wiki pages out of the members of the group. He will be responsible for collecting data from the group and presenting it in a suitable format to the wiki site. The group is going to collect its reports and hand them to Dylan who will look through them for errors and discrepancies. Dylan will also collect data and audio/visual information to assist the group in its reports as well and add that to the wiki page.

Technical Expert Timothy Dino

What the group is excepting of its Technical Expert is to be able to go through the power washer and analyze how it works, why certain components are used, and help the group with technical information needed for the reports. Tim has experience with engines and is going to be very knowledgeable when it comes to this part of the project and will help the rest of the group function more effectively. A large part of this project will be analyzing the components of the engine from the power washer. Associated CAD drawings will be needed with several of these components and this will all be the responsibility of the Technical Expert to insure its completion.

Project Analyst Kyle Berninger

The project has many deliverables that must be met by certain dates. To insure that we do not mix our objectives up or confuse what they are intended to deliver, the group has assigned Kyle as Project Analyst. Kyle will be responsible for going through each of the gates and determining exactly what they want for the project. Kyle will also review our ongoing work with respect to the gates to insure we are doing what is asked.

Dissection Lead Jack Rinaldo

Jack is acting as Dissection Lead for this project because he has firsthand experience taking apart and working on engines. Jack is going to guide the group through the disassembly and reassembly process. If the group has any questions about how to dissect a particular part of the engine then they will speak to Jack to have them answered. While working on the engine, Jack will also insure that proper documentation of the process is done. This means that all parts and the tools used on them will be known for later steps in the report.

Initial Product Assessment

This section is an overview of the pressure washer's function, components, and other topics of interest. This was made prior to dissecting the washer to become more familiar with it.

1.) Pressure washers are used to clean surfaces of dirt and other debris using a stream of water at high pressure. Surfaces can include buildings, fences, roads and other structures that are not sensitive to high pressure water. For example most cars should not be washed with a pressure washer to avoid damaging the paint.

A wide range of pressure washers are available on the market for home use. These can be used to quickly clean house siding, patios, trailers and other outdoor equipment. Other models are designed for professional use. For example, some washers inject detergents into the water stream which allows users to remove unwanted graffiti. Other commercial uses include cleaning contaminants from air ducts and removing barnacles from the hulls and propellers of ships. The washer that our group has received appears to be for home use.
Pressure washer uses

A pressure washer has several functions. It must intake water from some source. It must also utilize power, in the form of electricity or some type of fuel, to increase the pressure of the incoming water. It then must give the user control over the flow of water. This is done with a hand held nozzle that can be turned on and off.

2.) Pressure washers use a motor which creates rotary motion of a crankshaft. This motor can be either powered electrically or by a fuel. The washer assigned to our group has a motor that runs on gasoline. The motor transforms the chemical energy of the fuel into rotational energy of the crankshaft. This in turn creates linear motion of a piston or plunger which does work on the water to increase its pressure. The high pressure water exits the washer through a nozzle which transforms some of the internal energy into kinetic energy by reducing the cross sectional area of the stream. To summarize, chemical energy of a fuel is converted to rotational energy which is used to do work on the water, increasing its internal energy, through the use of a piston. A fraction of this internal energy is transformed to kinetic energy in the nozzle. The high energy water is used to break up unwanted debris on a surface.

3.) Due to safety restrictions regarding running gasoline engines indoors on campus, we have not been able to run the power washer yet. The engine looks like it would run well; it has obvious signs of use such as having some dirt on it. There seems to be no visible problems; it looks like it is in good shape.

If there are any problems they would most likely come from a few main sources. There might not be the correct amount of oil or other fluids in the engine, which would cause overheating and wear. Another probable cause for problems would be the fuses. If a fuse is blown, the engine will not run. A third cause for problems could be any solid buildup in the intake or exhaust or in the tubes feeding the engine. This would cause the engine to not run at full potential if it ran at all.

4.) This product is fairly complex. The engine goes through a fairly complicated process to produce mechanical work. It takes the chemical energy from gasoline, then combusts it, causing a piston to move creating mechanical work to power a driveshaft. However, this process has been around for at least a hundred years and is well known and understood.

There are five main components in the engine:

- The engine block is a few pieces of metal that house all the other components of the engine.

- The piston/valves are where fuel and air is mixed and combusted to produce mechanical work.

- The intake is where the air gets taken from the environment and put into the engine for combustion.

- The exhaust is where the excess gases left over from the reaction in the cylinders exit the engine.

- The driveshaft, which is turned by the movement of the pistons, takes the mechanical work and applies its movement to the run the compressor.

Many of the components are not too complex; the engine block, intake, and exhaust have no moving parts; however the piston/valves undergo a very complex process. The valves allow air and fuel to enter the cylinder and the exhaust to exit. The piston moves back and forth due to the expansion and compression caused by the combustion of the fuel. The driveshaft takes the back and forth movement of the piston and turns it into rotational movement in the driveshaft. These reactions occur very quickly, causing thousands of rotations a minute.

5.) The pressure washer that we are taking apart is composed of a few different materials, most of which are some form of metal to give it a strong and durable frame. The pressure washer is portable and has two rubber wheels. The washer also has a rubber hose to transport the water from the water tank to the nozzle at the end of the hose. The nozzle is made mostly of plastic. The rest of the pressure washer consists of the engine and compression unit which are made of metals which I would assume to be iron, steel, or aluminum. Our group is focusing on the dissection of the engine unit which is held together by steel nuts and bolts. The inside of the engine appears to be made of the same materials as the outside. Since the temperature inside the engine gets fairly high, a material other than metal would be more likely to melt at these temperatures.

6.) If I were the owner of a Snap-On pressure washer I would be happy with what I spent my money on. There are a lot of products available that are not very efficient when it comes to cleaning, but using pressurized water to clean guarantees it to work on almost everything. Not only is the pressure washer very effective but does not require much effort of the operator. The machine runs on anywhere between a 5-15hp engine and shoots a controlled force of water out of its hose that is aimed by the operator. The product does not require any experience or training to use correctly. The maintenance required is to check oil levels reguraly using the dipsticks, gasoline must be added to use the engine, the pull start must be checked for tears, and the air filter must be cleaned or replaced when it becomes sufficiently dirty.

7.) There are many other cleaning products available, but in most cases a pressure washer will give you the best results and be the most time efficient. Depending on the surface you are looking to clean someone could choose to use abrasive scrubbers with varies soaps, none of which are as effective as a gas power pressure washer. The only disadvantage in using a pressure washer is that they are more expensive than alternative cleaning products. Due to different sizes and engine power, a gas powered pressure washer can range anywhere from $300 to $1000, which is worth it considering how effectively it cleans. The advantages of owning a pressure washer are that you can clean large surfaces, for example removing the mildew off an entire wooden deck in a matter of minutes. Also the only resources you need are gasoline and a water supply. Another advantage is that the design is very sturdy and built to last. The company also offers a lifetime warranty if anything does happen. The only disadvantage of the product is that it is expensive and not something that every household can afford. There are companies that allow you to rent a pressure washer if you are only looking to use it for a short time period.