Quick Answer: Which Stroke Diesel Engine Is More Efficient?

What if petrol is used in diesel engine?

Putting petrol in a diesel car can cause serious damage to the fuel injection system and engine.

When petrol is added to diesel it reduces its lubrication properties, which can damage the fuel pump through metal-to-metal contact and create metal particles causing significant damage to the rest of the fuel system..

Why are two stroke engines banned?

Answer: Two-strokes left the market because they could not meet steadily-tightening EPA standards for vehicle exhaust emissions. … A four-stroke engine has a separate piston stroke for each of the four functions necessary to a spark-ignition engine: intake, compression, power, and exhaust.

Why is 55 mph the most efficient speed?

The most efficient speed for electric cars is closer to 15-20 mph versus 55 mph for ordinary cars. This is because the losses at low speeds for ordinary cars has to do with the construction and inefficiency of the gas ICE. Directly to the question at hand – they also give the sources of losses over the range of speeds.

What are the disadvantages of diesel engines?

Cons of diesel carsDiesel cars tend to be more expensive to buy than similar petrol models.Diesel fuel usually costs more.Servicing can be more expensive, although you don’t need to do it as often.Insurance can be 10-15% higher. [ … Diesel cars produce a lot more NO2.More items…•Feb 20, 2018

How many miles do diesels last?

What makes diesel engines work so well and last so long? It’s normal for your car’s gasoline engine to run for around 200,000 miles before it needs a serious overhaul, or you need a new vehicle. But diesel engines can continuously run for an impressive 1,000,000-1,500,000 miles before needing any major work.

Is it wise to buy a diesel vehicle?

Despite the negative headlines, the impressive fuel economy of diesel cars means they still make more sense than petrol and hybrid models if you do a high annual mileage or cover a lot of miles on the motorway. … Just bear in mind that, if your driving is mainly town-based, diesels really are best avoided.

Is a diesel engine worth it?

PRO: Diesels get great mileage. They typically deliver 25 to 30 percent better fuel economy than similarly performing gasoline engines. … Even if the price goes up, diesel fuel would have to be 25 to 30 percent more expensive than gas to erase the cost advantage of a diesel engine’s greater fuel efficiency.

Why are diesel engines so loud?

Diesel Engines Have A High Compression One of the biggest reasons that diesel engines are so loud is that they have such a high compression ratio. … Diesel engines make that iconic sound because there is an almost chaotic compression that causes the diesel fuel to ignite.

Should I buy a diesel with 200k miles?

High Mileage Generally speaking, diesel trucks are sold with higher mileage than the typical used vehicle. It is not uncommon to see a used diesel truck for sale with over 200,000 miles on it. Granted, diesel engines typically have better reliability than a gasoline equivalent, but high mileage remains a concern.

Which diesel engine is the most efficient?

Wärtsilä 31The new Wärtsilä 31 is the most fuel-efficient four-stroke engine currently available on the market. The diesel version of the engine consumes on average 8–10g/kWh less fuel compared with the closest competitor across its entire load range. At its optimum point this number can go as low as 165g/kWh.

Which engine has the most efficiency?

The electric engine is most efficient. Electric motors are very efficient at converting electricity into work. Physicists throw around abstract numbers like 90%, whereas when discussing combustion engines, they use numbers less than 40%.

Why do diesels last longer?

Diesel engines do last longer than petrol ones. Diesel is a light oil and when burned and used as fuel by the vehicle it lubricates the parts of the engine. This prolongs the life of the engine. … This is partly because of the intricate fuel pump which is expensive to repair or replace.

How can we increase the efficiency of a diesel 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).

Is high mileage on a diesel bad?

Diesel Rule 1: NEVER buy high mileage To be clear – avoid diesel cars with over 100,000 miles on the clock. Just avoid them. Really. They will cost you money, time and hassle.

Why is 4 stroke better than 2 stroke?

“Typically, 2-stroke engines rev up to higher speeds than 4-stroke engines, and this accounts for much of the higher power per pound,” Parish says. “Also, small 2-stroke engines use intake and exhaust ports instead of valves, thus saving the weight and cost of a valve train.

Should you drive a diesel hard?

Driving a diesel engine hard will produce less soot per kWh of useful work.

At what RPM should you shift gears diesel?

This means that when you are driving diesel, you can make an easy change at 12–1500rpm for normal driving. When you are driving quickly and want maximum accelleration, it would be given at maybe 4,400rpm and generally max out at around 4,750- 5,000rpm. Diesels give a bigger kick at lower rpm than petrol.

What RPM is a diesel engine most efficient?

Between 1,300 and 1,500 RPMGenerally speaking, the faster the engine speed, the more fuel the engine is using. Between 1,300 and 1,500 RPM is the most fuel-efficient engine speed, or what some would call the “sweet spot.”

Which one is more efficient a four-stroke engine or a two stroke and why?

As far as efficiency goes, the 4-stroke certainly wins. This is due to the fact that fuel is consumed once every 4 strokes. Four-stroke engines are heavier; they weigh upwards of 50% more than a comparable 2stroke engine.

At what RPM is an engine most efficient?

about 1000 rpmIt is likely to be geared for 2500 rpm or so at that speed, yet for maximum efficiency the engine should be running at about 1000 rpm to generate that power as efficiently as possible for that engine (although the actual figures will vary by engine and vehicle).

Is 2 stroke or 4 stroke faster?

A stroke is a motion of a piston, meaning a two-stroke dirt bike has 2 different motions of the piston, while a four-stroke has 4. 2 Strokes are generally more unstable and accelerate faster, while a 4 stroke is more consistent and has a higher top speed.

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