Efficiency of an Inlet Restricted Engine
Location
CSU 203
Start Date
11-4-2017 1:05 PM
End Date
11-4-2017 2:05 PM
Student's Major
Automotive and Manufacturing Engineering Technology
Student's College
Science, Engineering and Technology
Mentor's Name
Bruce Jones
Mentor's Department
Automotive and Manufacturing Engineering Technology
Mentor's College
Science, Engineering and Technology
Second Mentor's Name
Gary Mead
Second Mentor's Department
Automotive and Manufacturing Engineering Technology
Second Mentor's College
Science, Engineering and Technology
Description
An automotive engine with inlet restrictions will hurt its performance. There are two ways to regain the lost performance. Either increase its inputs, or increase its efficiency. The inlet restriction problem limits the input, so, the theory is that the efficiency must be raised to have the same output as if there was no restriction. To overcome the inlet restriction, ways of increasing the engine efficiency were tested. Both mechanical efficiency, and thermal efficiency were increased. Mechanical efficiency was improved by increasing how much the engine compressed the inlet air, and thermal efficiency by using energy that would have been exhausted from the engine, to do work. Mechanical efficiency was also raised by changing the timing of the engines valves. The first test was with the mechanical efficiency. It was found that by raising the compression ratio by 5% increased engine output by about 2%. This was achieved by using a piston that had a smaller combustion space. Back to back tests were performed. Even with the turbocharger, our volumetric efficiency is still low, so compressing the air even more should have a higher output. Thermal efficiency was raised by using the engines exhaust in a turbocharger in increase the flow demand on the restriction. This has raised the horsepower output by about 25%. Valve timing was also changed which gave the engine a gain of 25% horsepower. In all, the theory held that by making the engine more efficient, it can make up for losses in engine input.
Efficiency of an Inlet Restricted Engine
CSU 203
An automotive engine with inlet restrictions will hurt its performance. There are two ways to regain the lost performance. Either increase its inputs, or increase its efficiency. The inlet restriction problem limits the input, so, the theory is that the efficiency must be raised to have the same output as if there was no restriction. To overcome the inlet restriction, ways of increasing the engine efficiency were tested. Both mechanical efficiency, and thermal efficiency were increased. Mechanical efficiency was improved by increasing how much the engine compressed the inlet air, and thermal efficiency by using energy that would have been exhausted from the engine, to do work. Mechanical efficiency was also raised by changing the timing of the engines valves. The first test was with the mechanical efficiency. It was found that by raising the compression ratio by 5% increased engine output by about 2%. This was achieved by using a piston that had a smaller combustion space. Back to back tests were performed. Even with the turbocharger, our volumetric efficiency is still low, so compressing the air even more should have a higher output. Thermal efficiency was raised by using the engines exhaust in a turbocharger in increase the flow demand on the restriction. This has raised the horsepower output by about 25%. Valve timing was also changed which gave the engine a gain of 25% horsepower. In all, the theory held that by making the engine more efficient, it can make up for losses in engine input.
Recommended Citation
Seaver, Joshua. "Efficiency of an Inlet Restricted Engine." Undergraduate Research Symposium, Mankato, MN, April 11, 2017.
https://cornerstone.lib.mnsu.edu/urs/2017/oral-session-09/4
