- Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. …
- Higher compression ratio. …
- We need new cycles put into practical use. …
- Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work (air throttle more open).
How can we increase the efficiency of Otto cycle?
1. an ideal thermodynamic combustion cycle, as follows: a compression at constant entropy; a constant-volume heat transfer to the system; an expansion at constant entropy; and a constant-volume heat transfer from the system. The thermal efficiency of the ideal Otto cycle increases
with an increasing compression ratio
.
Why is Otto cycle more efficient?
Although for a given compression ratio the Otto cycle has higher efficiency, because
the Diesel engine can be operated to higher compression ratio
, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
How can we increase the efficiency of a diesel engine?
- Use Diesel Fuel Additives. …
- Consider Diesel Tuners. …
- Install Performance Air Filters & Cold Air Intakes. …
- Upgrade the Exhaust System. …
- Use DPF, DEF, and EGR Delete Kits. …
- Upgrade your Diesel Fuel Injectors. …
- Install a Turbocharger. …
- Schedule Regular Diesel Engine Tune Ups.
How efficient is the Otto cycle?
According to Mercedes, their power unit is now achieving
more than 45% and close to 50% thermal efficiency
, i.e., 45 – 50% of the potential energy in the fuel is delivered to wheels. The diesel engine has the highest thermal efficiency of any practical combustion engine.
What we can make to increase the efficiency and the power for the engine Why *?
Changing an exhaust system
can improve the efficiency of air leaving the system. The better the air leaves the better it can enter. This can increase engine performance in a way similar to how adding a cold air intake does. The principle is simple: Increasing oxygen levels allows a better burn.
What is added to petrol to increase the efficiency of engine?
Petrol additives increase petrol’s octane rating or act as corrosion inhibitors or lubricants, thus allowing the use of higher compression ratios for greater efficiency and power. Types of additives include
metal deactivators, corrosion inhibitors, oxygenates and antioxidants
.
Why efficiency of Otto cycle is more than Diesel cycle?
The simple answer is ,In the otto the energy available is fully used to raise the pressure in the cylinder. Higher the pressure implies larger work done. But in diesel cycle,
Part of the energy is added only during the expansion, So it does not contribute to the work
. Hence Otto cycle is more efficient.
What are the methods to increase the efficiency of Rankine cycle and explain any one?
5: The
effect of increasing the boiler pressure on
the ideal Rankine cycle. Increasing the operating pressure of the boiler leads to an increase in the temperature at which heat is transferred to the steam and thus raises the efficiency of the cycle.
Why the higher efficiency of the Otto cycle compared to the Diesel cycle?
A diesel cycle can operate with a
higher compression ratio
than an Otto cycle as there is no risk of auto-ignition of the fuel and only air is compressed. But, for a given compression ratio, the Otto cycle has higher efficiency than the diesel engine.
How do you increase low end diesel torque?
- Upgrade the Air Intake. One sure way to increase the performance of a diesel vehicle is to improve the airflow to the engine. …
- Change or Reprogram the ECM. …
- Using New Fuel Injectors. …
- Turbochargers. …
- Performance Exhaust.
How do you increase tractor torque?
- Clean House to Increase Horsepower. …
- Perform a Tune-Up on the Engine. …
- Install a Turbo Kit or Supercharger. …
- Install a Cold-Air Intake. …
- Install an Aftermarket Exhaust System. …
- Buy an Engine Tuner. …
- Conclusion.
What is the efficiency of diesel cycle?
A typical diesel automotive engine operates at
around 30% to 35% of thermal efficiency
. About 65-70% is rejected as waste heat without being converted into useful work, i.e., work delivered to wheels. In general, engines using the Diesel cycle are usually more efficient than engines using the Otto cycle.
What is the greatest possible value for thermal efficiency?
When expressed as a percentage, the thermal efficiency must be
between 0% and 100%
. Efficiency is typically less than 100% because there are inefficiencies such as friction and heat loss that convert the energy into alternative forms.
Which has more efficiency Otto engine or diesel engine?
6 Diesel Cycle
Although for a given compression ratio the
Otto cycle
has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
How do you increase thermal efficiency?
Lower compression ratios need higher degrees of constant volume to improve the thermal efficiency by
cooling loss reductions
. Therefore, a method that reduces cooling loss without lowering the degree of constant volume will be effective to improve the thermal efficiency of internal combustion engines.
What are some factors that affect the efficiency of automobile engines?
- (i) Duration of combustion of the charge. This increases the heat loss.
- (ii) Temperature of combustion. …
- (Hi) Speed of the engine. …
- (iv) Shape of the combustion space. …
- (v) Size of the cylinder. …
- (vi) Ignition timing in S.I. engines and fuel injection timing in C.I. engines.
Why are additives added to fuel?
The additives themselves claim to benefit your vehicle in numerous ways, from cleaning carburettors, injectors and intake valves, to keeping your fuel system free from excess water. In layman’s terms, fuel additives
promise better fuel economy, better performance, lower emissions and a prolonged engine life
.
How do you increase low end torque?
- Change the flowing exhausts and intake systems. Replace these components with a new one if you find any damage. …
- Install some high-quality spark plugs. …
- Replace the ignition lead with a better one. …
- Retune the air/fuel ratio (AFR) and the ignition timing maps.
What additives are added to gasoline?
Why gasoline additives
The types of additives include
oxygenates, ethers, antioxidants (stabilizers), antiknock agents, fuel dyes, metal deactivators
, corrosion inhibitors and some that can’t be categorized. Oxygenates are fuels infused with oxygen. They reduce the carbon monoxide emissions created when burning fuel.
How can we improve the quality of petrol?
- Check your tire pressure at least once a month. …
- At the pump, keep the hose in the tank until after the pump shuts off and make sure you allow all the fuel to pour out of the nozzle. …
- When appropriate, use your cruise control.
What is the primary reason why an Otto cycle is less efficient than a Carnot cycle?
The cylinders are not perfectly insulated from the engine block,
so heat energy is lost from each cylinder by conduction
. This makes the engine less efficient that a Carnot engine, because heat is being discharged at a temperature that is not as cool as the environment.
Which has higher efficiency Otto or Diesel or dual?
Explanation:
Otto cycle is more efficient than Diesel cycle
for a given compression ratio. … For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.
Why is Otto cycle more efficient than Diesel cycle for the same compression ratio and heat input in Otto cycle?
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because, in Otto cycle. Combustion
is at constant volume
. Expansion and compression are isentropic.
Which of the following is the way to improve the efficiency of the Rankine cycle?
The thermal efficiency of the Rankine cycle can also be increased by:
Increasing the average temperature of the working fluid at which heat is added to the cycle
. Decreasing the average temperature of the working fluid at which heat is rejected by the cycle.
What are the methods which can lead to increase in thermal efficiency of Rankine cycle?
Increasing the operating pressure of the boiler, automatically raises the temperature at which boiling takes place
. This raises the average temperature at which heat is added to the steam and thus raises the thermal efficiency of the cycle..
What is the relation between compression ratio and the efficiency of Otto cycle?
Explanation: This is the expression for efficiency of Otto cycle and rk
=compression ratio=Vmax/Vmin.
When cut off ratio is the efficiency of diesel cycle approaches the efficiency of Otto cycle?
Consequently, for any given compression ratio, except in the limit when the cutoff ratio is
zero
(i.e., no heat addition to the Diesel cycle), the Otto cycle is theoretically more efficient than the Diesel cycle. The cutoff ratio severely reduces the thermal efficiency of the Diesel cycle as its value increases (Fig.
What is difference between Otto and Diesel cycle?
The Otto cycle has less compression ratio (7:1 to 10:1) but in diesel cycle the compression ratio is high (11:1 to 22:1). In Otto cycle as well as in diesel cycle heat rejection takes place at constant volume. The efficiency of Otto cycle is
less
as compared with the Diesel cycle.
How can the efficiency of Rankine cycle be improved Mcq?
The thermal efficiency of the Rankine cycle can be increased
by the use of a regenerative heat exchanger
. … In this way, the amount of heat added at the low temperatures is reduced and the mean effective temperature of heat addition is increased, thus cycle efficiency is increased.
Which gas will produce the highest efficiency in an ideal Otto cycle for same compression ratio?
So out of given options
Helium
is monoatomic, so efficiency will be highest for Helium for a given compression ratio.
How efficient is a petrol engine?
Sadly, even with regular car maintenance such as a tune-up or an oil change, today’s gasoline engines are only
around 30 to 35 percent efficient
, which means roughly 65 cents out of every dollar you spend on gas goes to waste.
How do you find the thermal efficiency of a Diesel cycle?
The input and output energies and the efficiency can be calculated from the temperatures and specific heats: It is convenient to express this efficiency in terms of the
compression ratio r
C
= V
1
/V
2
and the expansion ratio r
E
= V
1
/V
3
. The efficiency can be expressed in terms of the specific heats and temperatures.
What are two ways to increase torque?
Torque can be increased in two ways: 1) by increasing the moment arm or 2) increasing the perpendicular force applied to the moment arm. The opposite is true for decreasing torque. If an object is at rest the torques on the object are balanced (they cancel out) and sum of those torques is zero.
How do you get more horsepower than torque?
There are several different ways to increase torque and horsepower:
Install a cold-air intake
: A cold-air intake improves turbulence to the combustion chamber, allowing fuel and air to mix more uniformly and detonate much more evenly; this improves compression and leaves less fuel waste.
How can I increase the torque of my truck?
- LARGER-DIAMETER THROTTLE BODY. …
- EXHAUST HEADERS & MANIFOLDS. …
- HIGH-FLOW CATALYTIC CONVERTER. …
- HIGH-FLOW CAT-BACK EXHAUST SYSTEM. …
- PERFORMANCE CHIPS & PROGRAMMERS. …
- FORCED INDUCTION (SUPERCHARGERS & TURBOCHARGERS)
How can I improve the performance of my engine?
- Use Synthetic Lubricants and Additives. …
- Check Your Ignition. …
- Install Larger Throttle Body and Injectors. …
- Ensure Good Compression. …
- Implement a Cold Air Intake (CAI) …
- Replace Your Exhaust Manifold With Real Headers. …
- Use Forced Induction (aka Power Adder) …
- Maintain Your Vehicle.
How can I add more horsepower to my truck?
- Get a tune-up. …
- Get rid of any extra “gear” you’re hauling around. …
- Install a cold-air intake. …
- Install an aftermarket exhaust system. …
- Invest in an engine tuner. …
- Install an STS turbo kit. …
- Install any number of aftermarket superchargers.
Why is Otto cycle more efficient?
Although for a given compression ratio the Otto cycle has higher efficiency, because
the Diesel engine can be operated to higher compression ratio
, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
How can we increase the thermal efficiency of IC engine?
- Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. …
- Higher compression ratio. …
- We need new cycles put into practical use. …
- Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work (air throttle more open).
How efficient is the Otto cycle?
According to Mercedes, their power unit is now achieving
more than 45% and close to 50% thermal efficiency
, i.e., 45 – 50% of the potential energy in the fuel is delivered to wheels. The diesel engine has the highest thermal efficiency of any practical combustion engine.
