Event Title

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.

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Apr 11th, 1:05 PM Apr 11th, 2:05 PM

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.
http://cornerstone.lib.mnsu.edu/urs/2017/oral-session-09/4