Does increasing compression ratio increase power?
This occurs because internal combustion engines are heat engines, and higher compression ratios permit the same combustion temperature to be reached with less fuel, while giving a longer expansion cycle, creating more mechanical power output and lowering the exhaust temperature.
How does compression ratio affect power?
The generally accepted gauge for adding compression is that one full point of compression can add between 3 to 4 percent power. So, if an engine is making 50 horsepower and we add a full point of compression (from 11 to 12:1 for example), this could potentially push the power to 51.5 horsepower.
How does compression affect engine power?
Even with engines having fixed valve timing (non-VVT), the effective compression ratio changes as the engine speed and load change. In short, if it changes the amount of charge in the combustion chamber from cycle to cycle, it changes the expansion ratio, and therefore its power.
Why do diesels make more power?
Diesel engines are designed with longer strokes in mind, as this produces more torque and more power. Their lean air-to-fuel ratio also helps diesel fuel go longer and add extra torque. Diesel fuel also has more energy per gallon than gasoline, which makes diesel fuel more efficient for combustion and torque.
Why do diesels have so much torque?
The higher turbo boost pressure, high compression ratio, and greater heat content of the fuel all add to the generation of cylinder pressure that is substantially higher than in gasoline engines too, but it is this continued injection of fuel that really makes the big torque numbers for diesels.
Why do diesels rev so low?
However diesels have the advantage of producing most of their power and torque at relatively low revs this because they are thermodynamically more efficient than petrol engines (more efficiently convert the energy in the fuel), and because they run at much higher compression ratios which means more thrust per piston …
Can you over rev a diesel engine?
Diesel engine runaway is a rare condition affecting diesel engines, in which the engine draws extra fuel from an unintended source and overspeeds at higher and higher RPM and producing up to 10 times the engine’s rated output until destroyed by mechanical failure or bearing seizure through lack of lubrication.
What RPM is a diesel engine most efficient?
around 2000 RPM
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.
Is 200k miles alot for a diesel?
High Mileage 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.
What is considered high mileage for a diesel?
Diesel Rule 1: NEVER buy high mileage To be clear – avoid diesel cars with over 100,000 miles on the clock. Just avoid them.
Will a little gas hurt a diesel engine?
Let’s say you accidentally drop a small amount of gasoline into your diesel fuel. This means the diesel fuel will prematurely ignite in the diesel engine, which can lead to engine damage. Gasoline contamination can also damage the fuel pump and mess up diesel injectors. This happens because of a drop in lubrication.
What happens if you put unleaded fuel in a diesel engine?
When petrol is added to diesel, it reduces the lubrication properties, which can damage the fuel pump through metal-to-metal contact, and create metal particles which can cause significant damage to the rest of the fuel system.
What happens if you accidentally put diesel fuel in your car?
When you realize that you have accidentally put diesel fuel into your gas tank, immediate action is necessary. The mechanic will simply open the drain and empty the entire amount of the gasoline/diesel mixture. The tank will then be filled with gasoline and drained again to remove all remaining diesel.
What do I do if I put gas in my diesel truck?
Have your mechanic drain the fuel entirely If you started your vehicle, you will want to let your mechanic know so they can inspect your engine, your diesel injectors, and your fuel pump and determine any damage from the premature ignition or lubricity of the gas.
How long will a diesel engine run on gasoline?
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.
Can you mix gas with diesel?
Diesel is also a lubricant, while gasoline is not. If gasoline makes its way into a diesel engine, it can jam the fuel pumps and the injectors. Mixing in a little amount of gasoline with diesel is a bad idea, but might not be catastrophic. A large amount of gasoline will cause significant damage to a diesel engine.
What fluids will destroy a diesel engine?
Thousands of diesel engines fail prematurely each year aided by the presences of glycol, fuel, soot and water in the engine oil.
Can you pee in your DEF tank?
The question comes up simply because human urine contains 2 to 4 percent urea. But sadly, the answer is “no”. A modern clean diesel car will recognize that your pee is not the right stuff. AdBlue solution has a far higher concentration of urea–32.5%–mixed into deionized water.
What’s the worst thing to put in someone’s gas tank?
If you are just mischievous and does not really want to destroy the engine, use sugar or any other sweet, sticky liquid. Sugar in a gas tank is an urban legend and it will clog up the fuel filter, just like other sticky sweet liquids such as honey, molasses, waffle syrup, pancake syrup, and similar things.
What happens if I put a small amount of AdBlue in my diesel tank?
What happens if I put AdBlue in the diesel tank? Putting it directly into your fuel tank could cause expensive damage to your fuel tank, pump and injection system. If you start the engine it’s likely to be an expensive write-off, so don’t touch the ignition.
What happens if you add too much AdBlue?
5. Do not overfill the AdBlue reservoir. This can create a vacuum inside the tank that prevents the AdBlue from being injected into the exhaust initially and this could cause an engine management light to illuminate.
How expensive is AdBlue?
Prices vary significantly, from around £0.70 per litre to up to £4 per litre, so it pays to shop in advance. A number of online retailers also offer 10 litre AdBlue refills – anything around £10 for 10 litres of AdBlue, including delivery, is a good price.
What does AdBlue do to diesel engines?
AdBlue is a non-toxic diesel exhaust fluid, made up of high purity urea and deionized water used to treat exhausts on diesel engines to reduce harmful emissions. Although it’s odorless and non-toxic, it can corrode metallic surfaces.
Is AdBlue made from pigs urine?
Is AdBlue® made from pigs’ urine? AdBlue® is a synthetic, highly purified solution of urea and demineralized water NOT pigs urine. Whilst the chemical urea is in pigs’ urine, it is found in much lower concentration alongside many other elements.
Is AdBlue only for diesel engines?
AdBlue is only applicable to diesel engines and is an emissions reduction technology that complements existing DPF technology. Diesel cars fitted with a DPF may not necessarily feature an AdBlue tank. However, cars with an AdBlue tank always feature a DPF as part of the overall emission control solution.
Can I use water instead of AdBlue?
What should I know about using AdBlue? Using water instead of AdBlue – In short, you mustn’t use water instead of AdBlue, or water down the AdBlue in anyway. AdBlue is a mixture of urea and 67.5% de-ionized water. If you accidentally add AdBlue to your fuel tank by mistake, it is important not to start the engine.
What happens if you run out of AdBlue?
What happens if I run out of AdBlue? If you run out of AdBlue while you’re driving, then the engine’s power and performance will be reduced to limit its emissions. Once you’ve stopped, you won’t be able to restart the engine if the AdBlue tank’s empty.
Can you disable AdBlue?
AdBlue is a chemical liquid used in Selective Catalytic Reduction (SCR) on diesel vehicles in order to reduce NOx levels. Disabling the AdBlue system is normally completed by reprogramming the engine management system, however some vehicles will require a small electronic unit to be hardwired into the vehicle.
Can I refill AdBlue myself?
Garages should refill AdBlue as part of a diesel car’s routine servicing. However, it’s possible to refill a tank of AdBlue yourself. Some service stations have AdBlue dispensing pumps.