Diesel Engine Components and Functions
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Questions and Answers

What is the primary function of a fuel injector in a diesel engine?

  • To optimize engine RPMs
  • To ignite the air-fuel mixture
  • To deliver fuel at high pressure for combustion (correct)
  • To enhance air intake pressure

    • How does a spark plug differ from a fuel injector in its function?

  • A fuel injector enhances air intake pressure
  • Both are essential for diesel engines only
  • A spark plug ignites the air-fuel mixture while a fuel injector delivers fuel (correct)
  • A spark plug requires high pressure to operate

    • Which component is primarily associated with improving engine efficiency and torque in diesel engines?

  • Flywheel
  • Cooling system
  • Turbocharger (correct)
  • Spark plug

    • What is a common characteristic of the lubrication systems used in diesel engines?

    <p>Designed to handle high friction and heat</p> Signup and view all the answers

    In terms of cooling systems, how do diesel and SI engines primarily differ?

    <p>Diesel engines dissipate higher heat levels from combustion</p> Signup and view all the answers

    What is the primary function of the fuel pump in a compression-ignition engine?

    <p>To draw fuel from the tank and supply it to the injectors under high pressure</p> Signup and view all the answers

    In compression-ignition (CI) engines, which component directly ensures that the fuel is injected into the combustion chamber?

    <p>Fuel Injector</p> Signup and view all the answers

    What is a key difference between fuel delivery systems in SI engines and CI engines?

    <p>CI engines inject fuel directly into highly compressed hot air</p> Signup and view all the answers

    What is the role of the fuel filter in a CI engine's fuel delivery system?

    <p>To remove impurities and protect the injectors</p> Signup and view all the answers

    Which of the following components is NOT included in the fuel delivery system of a compression-ignition engine?

    <p>Carburetor</p> Signup and view all the answers

    How does the fuel delivery system in CI engines ensure precise fuel injection?

    <p>By operating the fuel injectors under high pressure</p> Signup and view all the answers

    What is the purpose of the fuel tank in a compression-ignition engine?

    <p>To store the diesel fuel until it's needed</p> Signup and view all the answers

    Which aspect of the fuel injector is crucial for effective operation in CI engines?

    <p>It provides precise fuel delivery at extremely high pressure</p> Signup and view all the answers

    What is the primary function of high-pressure fuel lines in a compression-ignition engine?

    <p>To maintain high fuel pressure from the pump to injectors</p> Signup and view all the answers

    What role do glow plugs play in compression-ignition engines?

    <p>They preheat air for better cold-start performance</p> Signup and view all the answers

    In modern fuel delivery systems, what is the function of the common rail?

    <p>To store pressurized fuel and deliver it uniformly to injectors</p> Signup and view all the answers

    How does the injection pump contribute to the fuel delivery system?

    <p>It pressurizes the fuel for atomization during injection</p> Signup and view all the answers

    Which method of injection is utilized for higher efficiency in modern diesel engines?

    <p>Direct Injection (DI)</p> Signup and view all the answers

    What is the primary challenge addressed by high-pressure in fuel injection?

    <p>To ensure fine atomization of fuel during injection</p> Signup and view all the answers

    What distinguishes indirect injection (IDI) from direct injection (DI) in diesel engines?

    <p>IDI injects fuel into a pre-combustion chamber</p> Signup and view all the answers

    What occurs after the fuel injector sprays fuel into the combustion chamber?

    <p>The injected fuel mixes with hot, compressed air and spontaneously ignites</p> Signup and view all the answers

    What is the first step in the glow plug operation sequence during a cold start?

    <p>The glow plugs preheat the combustion chamber</p> Signup and view all the answers

    How long might glow plugs stay on during the pre-heating phase?

    <p>20-30 seconds</p> Signup and view all the answers

    What happens after the glow plugs have preheated the combustion chamber?

    <p>Fuel is injected and ignited</p> Signup and view all the answers

    In modern engines, what is the purpose of post-heating with glow plugs?

    <p>To reduce emissions and assist in warm-up</p> Signup and view all the answers

    Which of the following is NOT a sign of faulty glow plugs?

    <p>Stable engine operation</p> Signup and view all the answers

    What is a recommended maintenance practice for glow plugs?

    <p>Inspect them for wear or damage routinely</p> Signup and view all the answers

    What effect can faulty glow plugs have on fuel combustion?

    <p>Reduced power and increased fuel consumption</p> Signup and view all the answers

    During cold starts, why are glow plugs considered vital?

    <p>They ensure smooth ignition of fuel</p> Signup and view all the answers

    What is the primary function of a supercharger in diesel engines?

    <p>To enhance engine power and efficiency by increasing air intake.</p> Signup and view all the answers

    Which type of supercharger uses a rotating impeller to draw and compress air?

    <p>Centrifugal Supercharger.</p> Signup and view all the answers

    What maintenance is essential for optimal functionality of the glow plug system?

    <p>Ensuring electrical connections to the glow plugs are clean and tight.</p> Signup and view all the answers

    Which supercharger type is more efficient than the Roots supercharger?

    <p>Twin-Screw Supercharger.</p> Signup and view all the answers

    What warning may indicate a malfunction in the glow plug system?

    <p>Check Engine Light.</p> Signup and view all the answers

    Which characteristic describes the Electric Supercharger?

    <p>Typically used in hybrid systems and eliminates parasitic power loss.</p> Signup and view all the answers

    How does a supercharger improve the compression ratio in a diesel engine?

    <p>By boosting the amount of air entering the combustion chamber.</p> Signup and view all the answers

    What is a key advantage of using a Twin-Screw supercharger over other types?

    <p>It provides instant boost with high efficiency.</p> Signup and view all the answers

    What is the primary purpose of an intercooler in turbocharged engines?

    <p>To cool the compressed air before it enters the combustion chamber</p> Signup and view all the answers

    Which component should be regularly inspected to prevent turbocharger failure?

    <p>Turbocharger bearings</p> Signup and view all the answers

    What occurs to air when it is compressed by a turbocharger?

    <p>Its temperature rises and density decreases</p> Signup and view all the answers

    What is crucial for the proper functioning of a wastegate in a turbocharged engine?

    <p>Preventing excessive boost pressure</p> Signup and view all the answers

    Why is it important to clean an intercooler regularly?

    <p>To ensure the intake air remains cool and dense</p> Signup and view all the answers

    Which application prominently utilizes turbocharged diesel engines?

    <p>Marine diesel engines</p> Signup and view all the answers

    What is the consequence of allowing high temperatures of compressed air without cooling?

    <p>Reduced engine performance and potential damage</p> Signup and view all the answers

    What result do cooler and denser air provide when it enters the combustion chamber?

    <p>More oxygen mixed with the fuel</p> Signup and view all the answers

    What is a potential consequence of heat soak in an intercooler during prolonged high-performance situations?

    <p>Reduced cooling efficiency of the intercooler</p> Signup and view all the answers

    What issue can air leaks in the intercooler lead to?

    <p>Reduced engine performance</p> Signup and view all the answers

    In which application does the intercooler primarily improve efficiency for commercial vehicles?

    <p>By enhancing load-carrying capacity</p> Signup and view all the answers

    What operation principle differentiates compression-ignition engines from other engine types?

    <p>Combustion initiated by heat from compression</p> Signup and view all the answers

    What feature is common to diesel engines to ensure precise timing and atomization of fuel?

    <p>High-pressure fuel injectors</p> Signup and view all the answers

    Which issue is commonly associated with air-to-water intercoolers due to corrosion?

    <p>Internal coolant contamination</p> Signup and view all the answers

    What is the primary benefit of using intercoolers in marine and industrial diesel engines?

    <p>To maintain efficiency under heavy loads</p> Signup and view all the answers

    What key characteristic allows compression-ignition engines to function without spark plugs?

    <p>High temperatures from compression</p> Signup and view all the answers

    What does the equation $Q_{net, 23} = \Delta U_{23} + P_2 (V_3 - V_2)$ illustrate in thermodynamic analysis?

    <p>The relationship between heat exchange and work done.</p> Signup and view all the answers

    In the context of the Diesel cycle, how is $Q_{out}$ defined?

    <p>$Q_{out} = -mC_v (T_1 - T_4)$</p> Signup and view all the answers

    What effect do friction and mechanical losses have on engine performance?

    <p>They lower the mechanical efficiency of the engine.</p> Signup and view all the answers

    What is the consequence of air-fuel mixture deviations in real engines?

    <p>They can lead to variations in air-fuel ratios causing inefficiencies.</p> Signup and view all the answers

    What factor does the cut-off ratio $r_c$ relate to in the Diesel cycle?

    <p>The compression ratio and heat addition process.</p> Signup and view all the answers

    For which process is $W_{net, 41} = 0$ applicable in a closed system?

    <p>Process 4-1 at constant volume.</p> Signup and view all the answers

    How does ignition delay in diesel engines affect combustion?

    <p>It alters the timing of heat addition and impacts pressure profiles.</p> Signup and view all the answers

    Which formula represents the thermal efficiency of the Diesel cycle?

    <p>$\eta_{th, Diesel} = 1 - \frac{Q_{out}}{Q_{in}}$</p> Signup and view all the answers

    Which characteristic distinguishes the Otto cycle from the Diesel cycle?

    <p>The Diesel cycle uses a fuel-air mixture ignited by pressure and temperature.</p> Signup and view all the answers

    What is a significant factor leading to pumping and scavenging losses in real engines?

    <p>The need for work to intake fresh air and exhaust burnt gases.</p> Signup and view all the answers

    What does the ratio $\frac{P_4}{T_4}$ equal when divided by $\frac{P_1}{T_1}$ in the context of the Diesel cycle?

    <p>The cut-off ratio $r_c$.</p> Signup and view all the answers

    How is heat addition $Q_{in}$ expressed in the Diesel cycle?

    <p>$Q_{in} = mC_p (T_3 - T_2)$</p> Signup and view all the answers

    Why do specific heats vary with temperature in real engines?

    <p>They vary due to changes in combustion conditions.</p> Signup and view all the answers

    What is true about isentropic processes 1-2 and 3-4 in the Diesel cycle?

    <p>They are characterized by constant entropy.</p> Signup and view all the answers

    What role does knock play in engine performance?

    <p>It can lead to irregular combustion and impact performance.</p> Signup and view all the answers

    In the Diesel cycle analysis, what signifies the relationship $PV^{k} = constant$?

    <p>The changes in fluid pressure and volume.</p> Signup and view all the answers

    What assumption does the ideal cycle make about exhaust gases?

    <p>Exhaust gases are negligible.</p> Signup and view all the answers

    Study Notes

    Course Information

    • Course Title: MEC 756 Power Plant Engines
    • Chapter: 2
    • Lecture Notes Title: Reciprocating Internal Combustion Engines Part 4
    • Prepared by: Idris Saad, Ph.D.
    • Update Date: Oct 2020
    • Intended for students: EM 703

    Diesel Cycle: The Ideal Cycle for Compression-Ignition Engines

    • Learning Objectives:
      • Explain the purpose and fundamentals of Compression-Ignition (CI) Engines.
      • Identify and describe the key components of a Compression-Ignition Engine.
      • Illustrate and analyze the Diesel Cycle.
      • Derive and calculate the thermal efficiency of the Diesel Cycle.
      • Apply knowledge of the Diesel Cycle to real-world engineering applications.
    • Key Points:
      • Introduction to Compression-Ignition (CI) Engines.
      • Basic components of a Compression-Ignition Engine.
      • Four-Stroke Compression-Ignition Engine Operation.
      • Two-Stroke Compression-Ignition Engine Operation.
      • Diesel Cycle: The Ideal Cycle for Compression-Ignition Engines.
      • P-V and T-s Diagram.
      • Work, heat, and efficiency calculations.

    Introduction to Compression-Ignition (CI) Engines

    • CI engines (diesel engines) are widely used in heavy-duty vehicles (trucks, buses), industrial equipment, marine vessels, and power generation.
    • CI engines rely on compression to ignite fuel, unlike spark-ignition (SI) engines.
    • Key Features:
      • High thermal efficiency and fuel economy.
      • Designed for high torque output at low engine speeds.
    • Advantages:
      • Durability: CI engines are built to withstand higher pressures.
      • Fuel Type: Can use less refined fuels (diesel), which are typically more energy-dense.

    Combustion Fundamentals in CI Engines

    • Ignition Process:
      • Air is compressed in the cylinder to a high pressure and temperature.
      • Fuel is injected where it spontaneously ignites due to the heat of compressed air (no spark plug).
    • Combustion Phases:
      • Ignition Delay: Time between fuel injection and the start of combustion.
      • Rapid Combustion: Large portion of fuel burns, producing peak pressure.
      • Controlled Combustion: Fuel injection continues, combustion is moderated.
      • Late Combustion: Remaining fuel burns as pressure decreases.
    • Emissions Profile:
      • Higher NOx and particulate matter (PM) emissions compared to SI engines.
      • Lower CO and hydrocarbon (HC) emissions.

    Diesel Fuel Overview

    • Definition: Diesel fuel is a hydrocarbon-based liquid fuel derived from petroleum or biomass, designed for use in compression-ignition (CI) engines.
    • Chemical Composition: Primarily composed of alkanes (paraffins), cycloalkanes (naphthenes), and aromatics. Carbon chain length typically ranges from C10 to C22. Biodiesel alternatives are derived from vegetable oils or animal fats.
    • Types of Diesel Fuel:
      • Petroleum Diesel: Derived from crude oil through fractional distillation. Most common type.
      • Biodiesel: Produced from renewable sources (e.g., vegetable oils, animal fats). Designated as B100 (pure biodiesel) or blends like B20 (20% biodiesel, 80% petroleum diesel).
      • Synthetic Diesel (GTL/FT Diesel): Produced from natural gas or biomass using Fischer-Tropsch synthesis. Offers cleaner combustion and lower emissions.

    Cetane Numbers

    • Definition: The cetane number (CN) is a measure of the ignition quality of diesel fuel. It represents the fuel's ability to ignite quickly after injection into the combustion chamber.
    • Scale and Reference Fuels: The cetane scale ranges from 0 to 100 based on two reference fuels: Cetane (n-hexadecane) with CN = 100 (ignites easily) and alpha-Methyl Naphthalene with CN = 0 (very poor ignition quality).
    • Typical Cetane Numbers: Diesel fuels typically have a cetane number between 40 and 55. Petroleum diesel is ~40-50, Biodiesel ~50-65, and Synthetic diesel (Fischer-Tropsch) can exceed 70.
    • Effects on Engine Performance: Low CN fuels increase ignition delay, causing rough operation and high emissions, while High CN fuels reduce ignition delay, resulting in smoother and quieter engine operation and enhanced cold starting performance.

    Comparison to Spark-Ignition (SI) Engines

    • Aspect:
      • Ignition Method, Fuel Type, Fuel Efficiency, Power Output (Torque and Power), Thermal Efficiency, Emissions, Operating Costs, Maintenance
    • CI Engine: Compression-based (auto-ignition), Diesel, Higher, Higher torque at low speeds, Higher, Higher NOx and PM, Generally lower, Less frequent
    • SI Engine: Spark plug-initiated, Gasoline, Lower, Higher power at high speeds, Lower, Higher CO and HC, Generally higher, More frequent

    Basic Components of a Compression-Ignition (CI) Engine

    • Cylinder Block: Houses cylinders for high-pressure combustion. Made from cast iron or reinforced aluminum for strength. Contains fuel injectors, valves, and intake/exhaust ports—no spark plugs.
    • Cylinder Head: Contains spark plugs, valves, and intake/exhaust ports.
    • Pistons: Heavier, robust design to withstand higher compression and pressures.
    • Connecting Rod: Sturdy design for high forces from combustion.
    • Crankshaft: Heavier- converting high torque into rotational energy.
    • Camshaft: Controls valve timing, synchronized with fuel injection timing.
    • Fuel Injector: Delivers precise amounts of fuel into the combustion chamber at extremely high pressure.
    • Turbocharger: Commonly used in diesel engines to enhance air intake and boost pressure. 
    • Intercooler: Often paired with turbochargers to cool compressed air from the turbocharger and increase air density. 
    • Cooling System: Larger, designed to dissipate higher heat levels from combustion.
    • Glow Plugs: (Optional) Used to preheat the air in the combustion chamber for cold starts.
    • Others: Fuel injectors, fuel lines, manifolds, connecting rods and crankshaft.

    Fuel Delivery System in Compression Ignition Engines

    • Fuel Tank: Stores fuel.
    • Fuel Pump: Draws fuel from the tank and supplies it to the fuel injectors under high pressure.
    • Fuel Filter: Removes impurities from the fuel to protect injectors and the engine.
    • Fuel Injector: Delivers fuel into the combustion chamber at extremely high pressure.
    • High-Pressure Fuel Lines: Transport fuel from the fuel pump to the injectors while maintaining high pressure.
    • Common Rail: Stores pressurized fuel and delivers it to the injectors uniformly.
    • Injection Pump: Precisely controls the timing, fuel delivered to the injectors (older CI systems).
    • Glow Plugs (Optional): Preheat air in the combustion chamber.
    • Common rail, if applicable.

    Working Principle of the Fuel Delivery System

    • Fuel supplied from the tank by the fuel pump.
    • Passes through the fuel filter to remove any impurities.
    • Fuel is pressurized by the injection pump or sent to the common rail.
    • High pressure is crucial to ensure fine atomization during injection.
    • Fuel injector sprays fuel into the combustion chamber.
    • Injection timing and quantity are precisely controlled for efficient combustion and power generation.
    • Injected fuel mixes with hot, compressed air and ignites spontaneously.

    Types of Injection Systems

    • Direct Injection (DI): Fuel injected directly into the combustion chamber. Used in modern diesel engines for high efficiency.
    • Indirect Injection (IDI): Fuel injected into a precombustion chamber connected to the main cylinder. Offers smoother operation but lower efficiency than DI.

    Advantages of CI Fuel Delivery System and CI Engines

    • High Efficiency.
    • Robust Performance: Can handle high torque demands.
    • Better Atomization: Fine fuel atomization for efficient combustion.

    Maintenance Considerations

    • Fuel Filters: Regular replacement to prevent clogging and injector damage.
    • Fuel Injectors: Periodic cleaning or replacement to maintain precise fuel delivery.
    • High-Pressure Lines: Inspection for leaks or wear to ensure integrity.

    Purpose of Glow Plugs

    • Critical for cold starting diesel engines particularly in colder temperatures.
    • Preheat the air in the combustion chamber. Ensuring fuel ignites when injected, even when the engine is cold.

    Working Principle of Glow Plugs

    • Glow plugs are heating elements powered by electricity.
    • Heating up the glow plug raises the temperature of the air in the combustion chamber.
    • This assists in the ignition of the diesel fuel once injected under compression.
    • Glow plugs used to assist in smoother idling and reduce emissions during the warm-up phase.

    Key Components of a Glow Plug System

    • Glow Plug: Heating element
    • Glow Plug Control Unit: Regulates the timing of glow plug activation and deactivation, based on engine temperature.
    • Power Supply Circuit: Supplies the necessary current to heat the glow plug.
    • Thermal Management System: Monitors and manages the glow plug temperature to prevent overheating or damage.

    Types of Glow Plugs

    • Conventional Glow Plugs (Older Design): Made of metal and require longer preheating times.
    • Fast-Heating (Ceramic) Glow Plugs: Made from ceramic material, quicker start-up times, and more efficient performance.
    • Intelligent Glow Plugs: Equipped with sensors; Control the temperature and adjust the preheating cycle more precisely.

    Operation Sequence (Glow Plug Activation)

    • Cold Start: Glow plug control unit activates the glow plugs to preheat the combustion chamber.
    • Pre-Heating: Glow plugs remain on for 20-30 seconds to heat the air in the chamber.
    • Injection and Ignition: Fuel is injected into the chamber after preheating and the heat from the glow plugs help initiate combustion.
    • Post-Heating (Modern Engines): Glow plugs stay active briefly to reduce emissions.

    Signs of Faulty Glow Plugs

    • Hard Starting: Difficulty starting, especially in cold weather.
    • Increased Smoke: Excessive smoke or rough engine running.
    • Poor Engine performance: Reduced power, increased fuel consumption
    • Check Engine Light: Warning light indicating malfunction

    Maintenance and Care for Glow Plugs

    • Routine Checks: Inspect glow plugs for wear or damage.
    • Replacement: Replace faulty or worn glow plugs.
    • Electrical Connections: Ensure proper electrical connections to the glow plugs are clean and tight.

    Supercharger in Diesel Engines

    • Purpose: A supercharger is a forced induction system increasing the air intake into the engine's combustion chamber, enhancing engine power and efficiency.
    • In Diesel engines: Helps overcome the inherent limitation of the air-fuel mixture density and improving compression ratios and ensuring more air enters the combustion chamber.
    • Types: Roots, Twin-screw, Centrifugal, Electric
    • Working Principle: Exhaust energy drives a turbine to spin a compressor that draws in and compresses air. This compressed air carries more oxygen, allowing the engine to burn more fuel efficiently.
    • Benefits: Increased power output, improved fuel efficiency, better performance at high altitudes, reduce turbo lag.
    • Disadvantages: Power loss, fuel consumption, heat generation.
    • Maintenance: Lubrication, Air Filter, Belts and Pulleys

    Turbocharger in Diesel Engines

    • Purpose: A turbocharger is a forced induction system that uses exhaust gases to drive a turbine, which in turn compresses the intake air, increasing the amount of air (and oxygen) entering the engine.
    • Increased Engine Power and Efficiency: By increasing the amount of air, the combustion process is significantly improved, maximizing fuel utilization.
    • Types: Single Turbo, Twin Turbo (Parallel), Twin Turbo (Sequential), Variable Geometry Turbocharger (VGT).
    • Working Principle: Exhaust gases drive a turbine; the turbine's rotation drives a compressor, that draws in and compresses the incoming air, improving the compression ratio.
    • Benefits: Increased power output, improved fuel efficiency, better performance at high altitudes.
    • Disadvantages: Turbo lag (delay in boost response), heat generation, maintenance costs.
    • Maintenance: Lubrication, Air Filters, Belts and pulleys, Wastegates

    Intercooler in Diesel Engines

    • Purpose: An intercooler is a heat exchanger used in turbocharged or supercharged engines to cool the compressed air before it enters the engine's combustion chamber.
    • Importance: Cooling the compressed air increases its density, improving combustion efficiency.
    • Types: Air-to-Air, Air-to-Water.
    • Working Principle: Compressed air from the supercharger or turbocharger passes through the intercooler, where heat is dissipated. The cooler compressed air enters the combustion chamber.
    • Benefits: Increased power output, improved fuel efficiency, better performance at high altitudes, reduced thermal stress on engine components, lower emissions.
    • Maintenance: Regular cleaning, inspection for leaks, coolant level, and component checks.

    Four-Stroke Compression-Ignition Engine Operation

    • Overview: The Diesel cycle. Combustion and energy generation.
    • Key Features: No spark plug. Fuel injection for precise timing and atomization of fuel.
    • Four Strokes: Intake (drawing air in), Compression (compressing air rapidly), Power (injecting fuel, rapid combustion pushing piston downward), and Exhaust (gases ejected from cylinder).
    • Operation diagram/process and explanation: Intake, Compression, Combustion, Exhaust.

    Comparison between Otto and Diesel Cycles

    • Aspect: Working Principle, Heat Addition Process, Compression Ratio, Thermal Efficiency, Fuel Type, Emissions
    • Otto Cycle: Used in spark-ignition engines, constant volume heat addition, lower compression ratio (6-13), limited higher efficiency, gasoline and volatile fuels, high CO/HC.
    • Diesel Cycle: Used in compression-ignition (CI) engines, constant pressure heat addition, higher compression ratio (14-22), higher efficiency but sensitive to higher pressure, diesel fuel and alternative fuels, lower CO/HC but higher NOx and soot.

    Key Assumptions of the Diesel Cycle

    • Working Fluid: Air
    • No Friction: No frictional losses
    • Air Standard: Modeling only air, not the actual fuel-air mixture.
    • Constant Specific Heats: Specific heats are constant
    • Closed Cycle: No intake or exhaust during the cycle.
    • Heat Source and Sink: External

    Real-World Deviations from the Ideal Diesel Cycle

    • Non-Isentropic Processes: Heat transfer and friction are present.
    • Incomplete Combustion: Combustion not instantaneous or complete, leading to residual unburnt fuel
    • Heat Losses: Heat is lost from the surroundings.
    • Pressure and Temperature Drops: Due to delayed combustion and fuel injection variations.
    • Exhaust Gas Flow: Engines lose energy as high-temperature exhaust gases.
    • Friction and Mechanical Losses: Friction between moving parts, and crankshaft losses.
    • Air-Fuel Mixture Deviations: Variations in air-fuel ratios.
    • Variable Specific Heats: Specific heats are not constant over temperature ranges.
    • Ignition Delay: Delay between fuel injection and combustion.
    • Pumping and Scavenging Losses: Work required for intake and exhaust.
    • Knock and Noise: Combustion irregularity.

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    MEC 756 Power Plant Engines - Lecture Notes (PDF)

    Description

    Test your knowledge on the essential components of diesel engines, focusing on fuel injectors, fuel pumps, and lubrication systems. This quiz explores the differences between diesel and spark ignition engines, and delves into the intricacies of fuel delivery systems. Enhance your understanding of how these elements contribute to engine efficiency and operation.

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