UICSC Efficient Turbocharged Two-Stroke Engine

Turbo-Flakes is a senior design team that endeavors to develop a two-stroke turbocharged 600cc engine that is economical and shows vast improvement in efficiency and emissions relative to any other turbo two-stroke engine. This will be done on a Ski-Doo Snowmobile chasis with a 600cc E-TEC engine. This project is sponsored by the University of Idaho Clean Snowmobile Team.

Background
The University of Idaho has been competing in the SAE Clean Snowmobile Challenge since 2001. The goal of this challenge is to make a clean, quiet and fuel efficient snowmobile. This challenge helps to give students real world engineering experience while pushing the envelope on industry standards. The University of Idaho has won the Clean Snowmobile Challenge in 2003 with a four-stroke platform and in 2007 with a two-stroke platform.

The University of Idaho has a long background in engine research and technology where we like to push the limits. The concept of a turbocharged two-stroke engine is not new. The concept of a turbocharged two-stroke that is efficient is. This idea was conceived from long talks about what should be the industry standards. This is to answer the question, is it possible to substitute the power lost from running an engine lean with boost from a turbocharger?

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Design Specifications
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Goals
Team Turbo-Flakes endeavors to develop a two-stroke turbocharged 600cc engine that is economical and shows vast improvement in efficiency and emissions relative to any other turbo two-stroke engine.


 * Create a proof-of-concept engine platform
 * Develop a tuning strategy for turbocharged DI engine
 * Baseline dynamometer testing to show operation
 * Computer simulation of turbo vs. NA Pv diagrams
 * Computer control of variable vane geometry
 * CAD modeling showing packaging in chassis

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Project Learning
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Dynamometer Steps

 * 1) Install
 * 2) Get Running
 * 3) Start Tuning
 * 4) Get Baseline Data
 * 5) Detune Engine
 * 6) New Baseline
 * 7) Begin Sweeping Points

''Estimated Dyno Time Required: 500+ hours''

Tuning Steps

 * 1) Fuel Quantity Sweep
 * 2) Injection Timing Sweep
 * 3) Spark Timing Sweep
 * 4) Boost Pressure Sweep
 * 5) Repeat Until Adequate

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Final Product
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Math Modeling
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Controls Systems
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Dynomometer Setup
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Future Work

 * Dynamometer testing of turbocharged engine over full operating range
 * Detailed fuel, ignition, and boost tuning to fully characterize engine
 * Will use about $300 in fuel
 * Will probably use ~$2500 in parts
 * Will likely require 250+ hours of dyno time
 * Use software to model the fluid flows within engine under NA and turbo conditions
 * Virtual experimentation with port timing

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Reflections

 * Capstone projects need an external client
 * Small budgets lead to small outcomes
 * Research requires you to balance the original project plan with flexibility for the unknown

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Team Members
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Document Archive
Retrofitting Direct-Injection and a Turbocharger to a Two-Stroke Engine for Snowmobile Applications

University of Idaho's Reduced Speed Isobutanol Flex Fuel Direct-Injected 797cc Two-Stroke Snowmobile

Turbo-Flakes Design Specification Chart

Gantt Chart

Mid-Project Design Review

Turbo-Flakes Expo Poster

Turbo-Flakes Expo Presentation