We have no shortage of interest in bike engines. Whenever we get a chance, we try to explain how it happened and why it happened.
Our article today will satisfy some of your thirst for engines.
- What is an engine?
Answer: An engine is a special device made up of many parts. It is self-propelled and converts thermal energy into kinetic energy.
- What are the reasons for the production of black smoke in the engine?
Answer: If the engine is running at Over Load or Low Load, if the Compression Pressure is low, if the Piston Ring and Liner are worn out, if the Fuel Injection Timing is not correct, if the Valve Timing is not correct, if the Tappet Clearance is not correct, if the Injector is faulty.
- Why does the engine emit white smoke?
Answer: If water enters the combustion chamber, if there is fuel contamination, if the engine temperature is excessive, if the fuel injection timing is advanced.
- What is meant by carburetor?
Answer: Carburetor is called the heart of petrol engine. It prepares Air-Fuel Mixture in different proportions as per the requirement of engine and supplies it to engine cylinder.
- What is the function of fuel injector? / Why is injector used?
Answer: The function of injector is to spray fuel in atomized condition into the combustion chamber. Therefore it is also called atomizer.
- What is the function of the rocker arm?
Answer: The rocker arm works like a lever. It receives a push at the pivot end from the cam lobe, valve lifter and push rod and depresses the valve stem at the rocker tip end to open the valve.
- What do CIE and SIE mean?
Answer: CIE = Compression Ignition Engine.
(Refers to diesel engine) and
SIE = Spark Ignition Engine (Refers to petrol engine)
- Why is tappet clearance maintained?
Answer: This clearance is maintained because the valve stem expands due to heat during engine operation, which requires additional space.
- What is meant by tappet clearance?
Answer: The space between the valve tip and the rocker tip is called tappet clearance.
- What does cycle mean?
Answer: The work that the crankshaft performs inside the cylinder by rotating is called cycle.
- Why is a supercharger used in an engine?/What is the function of a supercharger?
Answer: The function of a supercharger is to force air into the cylinder at a pressure higher than atmospheric pressure to increase the volumetric efficiency of the engine.
- What is priming?
Answer: Priming is the process of lubricating various parts of the engine (Bearing, Valve Mechanism) before running it. This prevents sticky and friction-related wear and tear of moving parts.
- What is the function of the oil scraper ring?
Answer: Oil Scrapper Ring or Oil Control Ring is used to scrape excess lube oil from the cylinder wall and send it back to the crankcase.
- Name the five parts of an injector
Answer: Nozzle, Nozzle Valve, Nozzle Valve Spindle, Nozzle Valve Spring, Pressure Adjusting Screw.
- What is the function of the connecting rod of the engine?
Answer: It converts the reciprocating motion of the piston into the rotary motion of the crankshaft
And the power generated in the combustion chamber is transferred to the crankshaft through it.
- What is the difference between Two Stroke and Four Stroke engines?
| Two Stroke | Four Stroke |
| A cycle is completed in one rotation (360°). | A cycle is completed in two rotations (720°) of the crankshaft. |
| Beveled piston is usually used. | Flat, Concave and Crown piston are usually used. |
| Fuel and Lube Oil Consumption is high. | Fuel and Lube Oil Consumption is comparatively low. |
- What does the lube oil system do in the engine?
Answer: Lubricating, Cooling, Cleaning, Sealing and Noise Reducing.
- What is the function of the air intake system?
Answer: Providing clean and cold air to the cylinder, supplying air under pressure, cooling the related parts, reducing noise and removing the remaining burnt gas.
- What is meant by scavenging?
Answer: Scavenging is the process of pushing exhaust gas out of the combustion chamber with the help of intake air.
Also See : Common Motorcycle Problems-Six Problems Fixes And Solutions
- What is clearance volume?
Answer: When the piston is at TDC, the volume of the space between its top level and the bottom of the cylinder head is called clearance volume.
- What is meant by blow by?
Answer: When compression leak or exhaust gas leak from the combustion chamber and enters the sump due to wear of the liner or piston ring, it is called blow by.
- What problems can occur in the engine if the tappet clearance is too high?
Answer: Valves will open after a certain time, less air will enter the cylinder, compression pressure will be low, fuel will not burn completely, carbon will accumulate on the piston head, exhaust gas will not be completely released from the cylinder.
- What problems can occur in the engine if the tappet clearance is low?
Answer: The valve will open before the specified time and remain open for a long time, the valve lid may bend or break, the push rod or rocker arm may bend, and the piston head may be damaged.
- What is Bumping Clearance?
Answer: The distance between the top level of the piston and the bottom of the cylinder head when it is at TDC is called Bumping Clearance.
- What is meant by purging?
Answer: Purging is the process of removing trapped or accumulated air or gas from any liquid system of the engine and filling it with liquid. For example, Lube Oil System, Fuel System, etc.
- Write the function of plunger.
Answer: The position of the plunger in the barrel of the fuel injection pump. It works in reciprocating motion under the pressure of the cam and on it
there are three types of slots or grooves cut through which the fuel supply is controlled. (Vertical, Helical and Round Slot)
- What are the reasons for low engine lube oil pressure?
Answer: High clearance of Main and Big End Bearing, air entering the lube oil system, partially clogged lube oil filter, improper cooling of lube oil, faulty Pressure Regulating Valve, dilution, incorrect lube oil grade.
- When does compression pressure decrease?
Answer: Valve Seats Pitted, Valve Deformity, Blown Head Gaskets, Extensive Piston Ring and Cylinder Wear.
- In which engine is carburetor used?
Answer: In petrol engine.
- What is bearing clearance?
Answer: Half of the difference between the outer diameter of the crankshaft’s main journal and the inner diameter of the bearing shell is called bearing clearance.
- What is the function of the high pressure pump (fuel injection pump)?
Answer: To spray fuel into the working cylinder by supplying it to the injector at high pressure according to the firing order.
- What type of fuel filter is used in diesel engines?
Answer: Pre-filter or Primary filter and secondary filter. If their structure is Duplex, one can be kept on standby and the other can be used.
- What is required to do the pump timing?
Answer: With the Fuel Injection Pump disconnected from the gear train, the pump should be connected to the gear train by making POPC (Point Of Port Closer) and keeping the piston number 1 in the compression stroke (at a certain degree of BTDC).
- Where is the barrel located?
Answer: Fuel gallery of Fuel Injection Pump!!
