Swirl flaps are mechanical parts. We hold large quantities of diesel engine spares, many of which are available for same-day dispatch, and which are tailored to a range of car manufacturers, including Mercedes, Volvo, DAF and all other major diesel manufacturers. A single-mass flywheel should last the lifetime of the vehicle. An EGR valve that doesn’t fully close will reduce power and increase fuel consumption. Hard To Start Diesel Engine. The main problem with dual-mass flywheels is that the improvement in comfort and noise is often so small that it doesn’t justify the cost of the DMF and the reduction in reliability as compared to using a single-mass (solid) flywheel. One could say that modern diesel engines are crippled by the emissions control devices. In some cars, the EGR valves are a recurring problem due to poor design and may need replacing every 50,000 miles. The particulate matter needs to be burned off before the DPF becomes full. This is why second-hand, modern diesel cars only make sense for people who drive a lot. If you always drive a petrol car with the pedal to the metal, you are doing it right! The 14.7:1 ratio of air to fuel is the stoichiometric ratio. If left unattended, oil leaks can cause serious diesel problems, as they pose both an environmental threat and serious fire risk and can result in complete engine failure. It still does not include any swirl flap maintenance. Problems with the EGR valve, injectors or driving with a faulty thermostat will reduce the DPF lifespan. I will get to this topic a bit later. In these cases, they become a restriction. At partial loads (partially depressed gas pedal), the throttle plate is only half open to reduce the amount of air entering the engine. You can think of the DPF as soot trap. Air-fuel ratios are not that important in diesel cars. Swirl flaps are also used in petrol cars. With our expert knowledge of diesel systems, we offer highly effective reconditioning and rebuilding solutions at our engine machining centre for worn-out engines requiring professional care. Starter motor or related wiring fault. This is why diesel cars are getting banned from entering city centres around the world. The most common diesel problems can be split into two categories which mostly overlap; issue-specific and part-specific. It’s a different story in diesel cars. The compression ratio indicates how much the gas inside the engine cylinders gets compressed. In other words, diesel engines can do more miles before needing a rebuild or landing at the scrap yard. Pretty much all modern diesel cars are turbocharged, so don’t let a low compression ratio (16:1) deceive you – their effective compression ratio can be pretty high. Nevertheless, particulate filters are actually quite effective, and cars with DPFs emit even 90% less particulate matter. You also have the option to opt-out of these cookies. Too much air won’t hurt (to a certain point at which the engine blows up). Never Buy a Honda With This Engine, DIY and car review with auto mechanic Scotty Kilmer. You may find some information about dodgy swirl flaps in particular car models. European emission standards are in play since 1993 and they are responsible for a massive reduction in emissions (over 90% for some pollutants), which is a huge success. It’s no longer just a piece of pipe with a muffler. The DPF itself is fairly reliable. Petrol engines need to maintain a correct air-fuel ratio. When the car detects that the diesel particle filter is becoming clogged (around 50% full) it will try to initiate an active regeneration cycle. Black Smoke. We have plenty of diesel engine parts and years of experience under our belt. They are not set in stone. You don’t get the benefit of reducing throttling losses, and the EGR valve leads a much more difficult and shorter life. However, it is also illegal in the UK and probably in most other countries. Even without all these things, the last of the indirectly injected diesel engines were already reasonably powerful and well-mannered while still being very reliable. If you rarely leave the city for a longer trip, you are likely to dramatically reduce the lifespan of the DPF in your diesel car. The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to the mechanical compression (adiabatic compression); thus, the diesel engine is a so-called compression-ignition engine (CI engine).This contrasts with engines using spark plug-ignition of the air-fuel mixture, … However, I don’t recommend doing a solid flywheel conversion without doing some research beforehand. If this sounds great, wait until you get the bill for replacing the DMF in your car. If you take all of this into account, a modern diesel engine is about 20-25% more fuel efficient as compared to a direct injection petrol engine and closer to 30% more efficient when compared to a port-injected petrol engine. Other causes of bearing damage include an improper selection of bearing material for the engine type at hand. It is called active regeneration. These include: • The piston becoming burnt (usually by dirty fuel injectors). Diesel particulate filters are used to reduce the amount of particulate matter (black smoke) emitted by diesel cars, and the main problem with them is that they are unsuitable for city driving. Here’s what it looks like: The problem with the throttle plate is that it restricts airflow. When a department’s annual preventive maintenance program includes proper maintenance of a diesel-engine generator, troubleshooting repairs will be fewer and less frequent, and standby equipment will be much more reliable. This is also the reason why manufacturers keep increasing the fuel injection pressures to ridiculous levels in order to make the fuel mix better with the air. The most common problems with diesel engines will incorporate a mixture of the above issues and affected diesel engine parts. Increasing the exhaust temperature is done by injecting extra fuel into the exhaust, where it burns. Engine may be seized Engine may be hydraulically locked due to … Joking aside, if you buy a modern diesel car in poor condition or you’re simply unlucky, you may have to pay through the nose to keep the car going. On a final note about compression, forced induction (turbocharging and supercharging) increases the effective compression ratio. Oil supply problems predominantly stem from either incorrect oil use or a lack of oil. The compression ratio is directly linked to engine efficiency. Also, turning the engine off during a regeneration cycle is a bad thing. Feeding a solvent into the combustion chamber works against the oil film that prevents pistons and cylinders from wearing. The first thing that starts to fail on this engine is the crankcase ventilation system. • The piston becoming cracked (caused by frequent use of poor quality fuel). On a positive note, diesel engines are pretty good when it comes to carbon dioxide (CO2) emissions. But near a mileage of 100-150k miles, auxiliary engine systems start to fail. A basic diesel engine needs only a constant supply of clean fuel, plus air to provide oxygen for combustion. Improvements in injection technology are what made diesel cars what they are today – quiet, powerful and efficient. The mechanism that adjusts the swirl flaps may fail. This is including, but not limited to: • Pistons expanding and scraping against cylinder walls (crushing the head gasket in the process). Also, diesel engines can operate at higher boost pressures than petrol engines because too much boost (or too high compression ratio) makes petrol engines susceptible to destructive knocking (detonation). As is often the case, this comes at a price because engineering design at this level of technological maturity is almost always a compromise. It also makes the engine reach operating temperature quicker (hot exhaust fumes returning to the engine). The original diesel particulate filter is there too, but if you’re not interested in cars, you probably didn’t even know about it (you will after reading this article!). The catalytic converter turns the hydrocarbons and CO into CO2 and water. Modern diesel engines still operate on the same principle as 40 years ago. Bearings face a lot of stress due to the daily friction they experience- insufficient lubrication can therefore lead to bearing (and consequently engine) failure. }(document, 'script', 'facebook-jssdk')); This article will help you decide if a modern diesel car is a right choice for you. Removing the DPF permanently is possible (it’s called a DPF delete). However, keep in mind that not all modern piezoelectric injectors can be reconditioned. Cars fitted with diesel particulate filters burn more fuel than cars without. If there is reasonable access to the EGR valve in your car, I recommend taking it out and cleaning out the soot every 50,000 miles. Buying a Honda. The first major change that Euro emission standards introduced was mandating the use of catalytic converters in petrol cars since 1993. The amount of CO2 emitted by a combustion engine is linked to its efficiency. For the sake of example, let’s say that you bought one with 150,000 miles on the clock, and you are planning to keep it for three or four years. The extra CO2 emitted by cars with particulate filters is the lesser evil when compared to the particulate matter that gets burned away. But opting out of some of these cookies may have an effect on your browsing experience. However, not knowing the car’s history increases the risk substantially. The first-generation directly injected diesel engines were quite good too, albeit a lot more complex and more expensive to maintain. Well atomized fuel mixes better with the air. Fault Code Symptoms Possible Cause; Engine will not Crank: Low starter battery voltage. Please note that solid flywheels also dampen torsional vibrations. Also, many small droplets have a larger combined surface area than fewer large droplets (more efficient burn). This, coupled with a diesel engine’s better economy over distance, means that diesel cars are best suited to long-distance drivers. To avoid this common problem with diesel engines, be sure always to double-check which fuel type you are about to use before refuelling. Imagine trying to breathe through a straw. For diesel engines to conform to the Euro 6 emission standards that came into force in 2015, all diesel cars need to be fitted with Diesel Particulate Filters (DPF) and many cars will require Selective Catalytic Reduction (SCR) systems that spray ammonia or urea into an SCR catalytic converter mounted to the exhaust system. There are very few people that use their cars only on the motorway. When you step on the gas, the EGR valve should close, as long as it’s not stuck. If the active regeneration cycle gets interrupted too many times or it never has a chance to even start, the DPF will continue to accumulate particulate matter. Its disadvantage is the need for additive refills every 80,000 miles or so, and the system is even more complex. The ONS type gas distribution mechanism with an overhead camshaft and a direct drive of 8 valves (2 valves per cylinder) is assembled in the cylinder head. … Mercedes V6 OM 500 Euro 2/3 Piston Kit |40448601. These emission standards became so stringent that getting diesel engines to pass has become very difficult and requires many engineering workarounds. The diesel fuel injectors are the key parts that define the performance of a diesel engine as they directly affect the combustion efficiency and emissions. The problem with this is that a lean mixture is difficult to ignite, and it may increase combustion temperatures to dangerous levels, high enough to melt engine pistons in severe cases. These cookies do not store any personal information. Petrol engines need to operate close to this value. Diesel fuel filters should last a thousand hours … Euro 6 marks the widespread appearance of SCR systems. If the torsional vibrations are not dampened, they can manifest as transmission gear rattle at standstill or vibrations/noise when driving at low engine speeds (below 2000 RPM). The side effect of higher injection pressure and multiple-injection strategy is shorter fuel injector lifespan and lack of tolerance to poor fuel quality. They close at idle and low engine speeds to create a swirl in the air going into the cylinders. The extra vibrations may damage the transmission in some cars because the gearbox may not have been designed to work with a solid flywheel to begin with. Some of the components in these systems are not very reliable. The diesel particulate filter traps soot and burns it off when it gets full. At low engine speeds, one port is closed while the other remains unrestricted. Another reason for better diesel efficiency is the lack of throttling losses. Keep in mind that this option is illegal because it increases emissions. This is when comparing engines that are equivalent in terms of power output. This website uses cookies to improve your experience. The price to pay is the high maintenance cost of modern diesel cars once they reach a certain mileage. Diesel tractor engines have several advantages over their gasoline-powered counterparts. The original simplicity of diesel engines has been lost. Also, some cars were already fitted with SCR systems, which were used as an alternative to NOx traps. The improvements in fuel injection technology and the use of dual-mass flywheels managed to turn a frog into a prince. Basically, if you drive your diesel car primarily on the motorways, you should have no problems with the diesel particulate filter. This variant of the DPF is used by the French PSA Group (car brands: Peugeot, Citroën and Vauxhall/Opel since 2017). Technicians can easily correct most problems with diesel … The flaps are operated by an actuator (vacuum actuator or electric motor). There are three types of DPF regeneration cycles: This type of regeneration happens when the exhaust temperature is high enough, i.e. The total pollution is higher. Engine overheating is caused when an engine is pushed too hard and can give rise to a whole host of negative side-effects. Some of these components have relatively short lifespans, which is the source of the high maintenance cost of diesel engines. At full throttle, the EGR valve closes and no exhaust fumes are returned to the engine. That’s why some modern diesel cars are not much louder than petrol cars. js.src = 'https://stillrunningstrong.com/wp-content/cache/busting/facebook-tracking/fbsdk-en_GB.js#xfbml=1&version=v3.2'; Have you heard of waterjet cutting? Petrol engines need to maintain a correct air-fuel ratio. Active regeneration is typically required every 300-700 miles in typical driving (urban + motorway). Low fuel pressure in a diesel engine. This may result in having to get the whole unit replaced by a reconditioned or used engine. This leads to a more complete combustion, more power, better efficiency and less smoke. Active regeneration usually takes 5-15 minutes of continuous driving, ideally at a constant speed. The soot remains trapped in the filter while the exhaust gases get released into the atmosphere. At this point, the car needs to be taken to a specialist to perform a forced regeneration (also called service regeneration). Swirl flaps live in the air intake manifold. However, when they are designed well, they aren’t as problematic. This happens only during low and medium engine loads. The price above is what independent car repair shop will charge you. A traditional single-mass flywheel is a solid piece of metal that relies on its inertia to smooth out engine’s power delivery. The flaps fail because of increased friction in the mechanism caused by carbon build-up. While emissions from petrol engines can be dramatically reduced by catalytic converters, diesel engines require a lot more exhaust after-treatment. The dual-mass flywheel is yet another reason to avoid buying a diesel car for driving in the city. Also, reconditioned fuel injectors won’t last as long as new ones. The EGR system in petrol cars is usually reliable because the exhaust gases contain a fraction of the particulate matter as compared to diesel engines. Typical carbon build-up on the swirl flaps, Dual-mass flywheels dampen torsional vibrations entering the gearbox (green line), The springs in the centre of the clutch plate dampen shocks and torsional vibrations. The other major improvement in diesel injector technology is the ability of piezoelectric and solenoid injectors to deliver multiple injections per combustion cycle. I find it funny that the DMF makes it possible to drive at such low revs comfortably, but it’s exactly what makes it wear out quicker. In other words, the combustion moves closer to “burning” and further away from “exploding”, which makes the engine sound smoother and quieter. It is called “Filtre à Particules” in French or simply FAP. Your email address will not be published. The soot storage capacity is limited. Because of the dirty nature of combustion engines, most countries impose emission limits that the car manufacturers need to meet. fjs.parentNode.insertBefore(js, fjs); It also protects the drivetrain from torsional vibrations. Carbon build-up is a side-effect of feeding exhaust gases back into the engine (EGR valve). If you take the car to the dealership, you can add 50% or double those figures. Here’s how to control a diesel engine: That’s pretty much it. The typical lifespan of a diesel particulate filter is somewhere between 150,000 and 200,000 miles when the car is used and maintained correctly. Its job is to smooth out the jerky nature of the engine’s power delivery. Also, nitrogen oxides are linked to acid rain, while soot is linked to smog. Everything is governed by computers more powerful than what was necessary to put people on the moon. Improvements in fuel injection technology are what made modern diesel cars less diesely (for a lack of a better word). You would be surprised how much sludge and carbon gets deposited in the air intake manifold due to EGR action. An alternative option is to remove the swirl flaps altogether. My back-of-a-cigarette-packet calculations tell me that you should be doing at least 12,000 miles every year for the fuel savings to offset the potential cost of maintenance. High RPM torque and power output are not affected unless the swirl flaps don’t work properly or carbon build-up becomes severe. It is one of the reasons why diesel engines are more efficient than petrol engines. If the car model you are looking to buy is fitted with “high risk” swirl flaps, you should take some precautions, like replacing the intake manifold with a new one. Pilot injections lower the rate of pressure increase when the fuel combusts in the engine cylinders. Comment document.getElementById("comment").setAttribute( "id", "ac462ca7af48e80095bac581d60e7283" );document.getElementById("hbef678ffc").setAttribute( "id", "comment" ); Necessary cookies are absolutely essential for the website to function properly.