What is the most efficient internal combustion engine?
Wärtsilä 31SG
Which cycle is mostly used in high compression engines?
Otto cycle
Which is more efficient Otto or Diesel cycle?
Comparing efficiency to Otto cycle Comparing the two formulae it can be seen that for a given compression ratio (r), the ideal Otto cycle will be more efficient. However, a real diesel engine will be more efficient overall since it will have the ability to operate at higher compression ratios.
Which fuels can an Otto engine run on?
The Otto Cycle engine was eventually adopted to run on Ligroin and eventually gasoline, and many gases. During WWII Otto engines were run on more than 62 different fuels, such as wood gas, coal gas, propane, hydrogen, benzene, and many more. The engine is limited to light fuels.
Why does thermal efficiency increase with compression ratio?
As the compression ratio increases, the fuel mixture is sufficiently compressed thereby increasing the thermal efficiency, so that less fuel is required to produce the same amount of energy. Fuel consumption is reduced at higher compression ratios between 8 and 9.
What is the best engine compression ratio?
Compression ratios usually range from 8:1 to 10:1. A higher compression ratio — say, from 12:1 to 14:1 — means higher combustion efficiency.
Does Turbo increase thermal efficiency?
Turbocharger is used to increase intake air pressure prior to putting it into the cylinders to increase thermal efficiency of the engine. The product from the turbine will be transmitted via its shaft to the compressor to increase intake air pressure, which then will increase temperature of the intake air as well.
Do turbos use more fuel?
If anything, adding a turbocharger could produce worse gas mileage, not better. Instead of adding a turbo to get more power out of the same engine, they are adding a turbo to get the same amount of power out of a smaller engine. The turbo itself doesn’t save gas, but using the smaller engine does.
At what RPM is Turbo activated?
From 1-2,400 rpm, the primary turbocharger is activated; at 2,400-2,800 rpm, the second turbocharger is activated; and beyond 2,800 rpm, both turbochargers function. This system is recommended for diesel engines with displacements of 2.0 liters and above, and V engines.
How do you increase the efficiency of a turbocharger?
The basic principle is that by cooling combustion temperatures and reducing the tendency of the fuel-air mixture to fire erratically, water injection allows engineers to increase an engine’s compression ratio, or reduce engine size, that way increasing its efficiency.
Does a turbo affect engine life?
2. Turbos Reduce the Lifespan of an Engine. One of the most common turbo myths is that running boost will damage your engine over time. However, a properly implemented turbo pushing enough PSI through a motor to produce respectable levels of power won’t strain a motor any more than idling in traffic will.
Why small turbo engines are not efficient?
To combat fuel efficiency, downsized turbocharged engines have become the new norm. Smaller engines use less fuel, but being turbocharged adds pressure, which can lead to higher temps and engine knock, damaging the engine. To avoid this, you have to have a lower compression ratio.
Why do turbos use more fuel?
In addition to increasing power, turbos make use of the exhaust gases that otherwise would spew from the tailpipe as wasted energy. Turbos and superchargers both reduce the amount of work the engine has to do to breathe in the fresh air, increasing its efficiency.
What is the disadvantage of turbo engine?
Disadvantages of a Turbo Engine Well, more power means more energy output per second. This means that you have to put more energy when you use it. So you must burn more fuel. In theory, that means an engine with a turbocharger is no more fuel efficient than one without.
Why are turbo engines bad?
The engine oil deteriorates faster under extreme heat. A turbocharged engine will not forgive low oil level, poor-quality oil or extended intervals between oil changes. Most turbocharged cars need high-quality synthetic oil and have shorter maintenance intervals. Some require premium gasoline.
Do Turbos need premium gas?
Engines with high compression ratios or turbochargers often require high octane fuel found in premium gas for optimal performance and fuel efficiency. However, the majority of cars on the road today are optimized to run on regular gas.
What happens if you use regular gas in a turbo engine?
Using regular gas in an engine that requires premium could void your warranty. That is most likely to happen if using regular causes severe engine knock or pinging (premature ignition of the fuel, also known as detonation) that damages the pistons or other engine parts.
Who has the best premium gasoline?
Of America’s largest nationwide chains, Chevron scores the highest points in overall customer satisfaction. Its reach spans over 7,800 stores, and while some gas stations offer convenient food marts, one location in North Hollywood goes above and beyond gasoline.
Does premium gas last longer?
Sadly, there’s nothing in premium gasoline that would make it last longer than other fuels from the pump. Since the distinguishing feature is the higher-octane levels, the only real benefit you gain is lowering the chance of engine knocking, which isn’t much of a threat on most modern fuel systems.
Is premium gas better for small engines?
For those wondering “Is premium gas better for small engines?” the answer is most likely no. That’s because small engines are not built with high compression ratios. If you perform regular maintenance on your equipment, (keep fresh fuel, clean the carburetor, etc.), then Regular octane gas will work just fine.
Why premium gas is a waste of money?
But what is commonly called “premium gasoline” is a waste of money for countless drivers. That’s because they don’t know what kind of fuel their car is meant to take or because they think they will somehow get better performance or better long-term reliability by using a higher grade of gas.
What happens if you put 87 octane in a 93 octane car?
If you usually fill your tank up with 87-octane gasoline and you accidentally put in a higher octane blend (say, 91, 92, or 93), don’t worry. You’re actually filling your car or truck with a different blend of gas, which means it will burn differently in your engine.
