Expert Backcountry Snowmobiling Riding Tips, iy_2021; im_02; id_06; ih_03; imh_36; i_epoch:1612611400794, py_2021; pm_01; pd_11; ph_10; pmh_31; p_epoch:1610389915778, link-block-publisher; link-block-publisher_link-block-publisher; bodystr, pn_tstr:Mon Jan 11 10:31:55 PST 2021; pn_epoch:1610389915778, https://blog.amsoil.com/why-does-my-engine-knock-3-possible-explanations/. I often wish … I owe my thanks for years of on the job training to DuPont (back in the days of lead in gasoline) and Lubrizol (in support of multifunctional gasoline additives and oil additives which are required today). You clearly know your stuff. Wouldn't this make a lot of sense considering everyone's focus on saving energy and being green? True I pushed the envelope for maximum performance at my skill level but then most of your readers will know the risk and rewards. If there is smoke coming from the exhaust it could indicate a more serious problem with the engine. The process is compression driven, and the higher the compression ratio within the cylinder, the greater the power output of the engine. Some knocks should not be ignored they can indicate failure whether oil-related or not. Fuel with too low an octane rating for your engine can sporadically ignite prior to the piston reaching TDC. Inspect the operation of the EGR valve and check for a buildup of carbon deposits. Engine Rattling When Accelerating. This engineering term, you might have experienced in your motorbike. ... of course the compression ignition and not in how the fuel is injected although it is done so somewhat differently in diesel engines. What's New? Peak performance is obtained at 2-3 degrees below the ignition setting for trace knock. Knocking … AcceleratingEngine Knocking Noise When Accelerat ing|freeserifi font size 13 format Thank you very much for reading engine knocking noise when Page 1/24. In a diesel engine, it can be a single fuel injector that is injecting droplets rather than atomizing the fuel. I guess it must have been diesel knock. Knock is seen by many as a tolerable side-effect of better fuel economy. There are guides for engines with a timing chain. A diesel engine is difficult to start in cold weather due to its lack of an electronic ignition system. Bad injectors can cause knock as well as grey smoke and a stinking exhaust. The sudden appearance of white smoke and a smoky waxy smell may indicate this. Let me explain; most of the typical knocking and pinging in a diesel engine comes from injector “nailing” and ignition knock. A diesel engine is difficult to start in cold weather due to its lack of an electronic ignition system. When you hear that sound, you know you're about to drive a rig. The causes of engine knocking sound may range from bad fuel, faulty spark plugs, or even dirty combustion chamber. Often an injector "pop-pressure" of 1800 psi will be most unsatisfactory as the droplets will be too big but a pop pressure between 2200 and 2400 psi will give a dramatic improvement. The “rule of thumb” calculation should equal 16.5 to 22 degrees. It can indicate overheating or that you are in too high a gear for the engine to cope with comfortably. I have a 2000 mustang and recently the engine has started knocking while the car is accelerating. In a diesel engine, only the air is compressed. Gasoline is cheaper in USA and Diesel is cheaper in Europe. Originally published: June 2, 2017. Also there can be differences in CNG octane quality, in the sound insulation of the engine compartment and also the hearing ability all of which can affect the observed octane rating. This is most likely to occur with a low-quality conventional oil that thins at high temperatures, preventing the engine from developing good oil pressure. The spontaneous ignition of air/fuel inside the cylinders is a common source of engine knock. Both vehicles with a timing belt or a chain have a tensioning system to keep it snug and … When you mash the accelerator out of the parking lot, that’s when you hear an engine knocking sound. It doesn't do it when I first start driving, it waits until a little over 5 minutes after I start. Doing so can help keep your vehicle running properly and quietly for years. But instead I bought a timing advance electronic unit on ebay. Diesel engines have roughly twice the compression ratio of gasoline engines, and so are built to withstand compression ignition. The timing of the fuel being injected into the diesel engine is critical to prevent parts breakage, which can result from severe knock. The noise is also not there when I'm not pressing the gas. If this over-fueling operation is not operating properly, it can cause white smoke and damage to the engine. When a vehicle is brand new there are no combustion chamber deposits requiring only 82-84 R+M/2. First ,you guys know your stuff ,second ,all I can say is that I’ve been using amsoil in my harleys for years ,the shovelheads ran great ,and so far I’m on my 5th Silverado 2009 ,and from day one that’s all I’ve ever ran , I’m no sales man’s, I think it’s great stuff , retired ibew member from Philadelphia pa. Quality synthetic oil will go a long way in preserving the life of any engine and regular oil changes will protect your engine even better. I didn't think diesel engine's would do this, is there anyone come across this before and has an idea what it could be? This noise is caused by the compression of air in the cylinders and the ignition of the fuel as it is injected into the cylinder. Rod knock is the worst of the three. This is much the same as a gasoline engine suffering from pre-ignition or spark knocking. I have driven 40K miles with this setting. Some old industrial diesel engines often sound as if the pistons are being hit with sledge-hammers but allegedly on those types this is normal! I have a 12 year old diesel car which I have owned for 9 months now. Under certain conditions, the fuel/air can spontaneously ignite too early in the combustion cycle. It’s especially noticeable in the morning before the oil has had a chance to circulate throughout the upper end of the engine. Updated. Most likely because the extra load has increased the compression in the cylinder and pre-ignition is occurring. In a gasoline engine, fuel is mixed with air and then compressed before an electric spark ignites the mixture. It's not normal knock - it's pretty damn loud. The telltale sound of an operating diesel engine is due in part to the fuel injection process. If you hear a light knocking or pounding sound, the noise can usually be traced back to your connecting rods. Timing the ignition in a gasoline engine is a precision event and too early or too late can cause damage. Once the clearances between the crank journals and connecting rods have widened due to wear, it’s just a matter of time before catastrophic damage. How can a Diesel Engine be Converted to Biodiesel. Modern diesel engines are designed to deliberately over-fuel the engine (or just one cylinder) for brief periods to create heat to burn carbon off of the Diesel Particulate Filter or DPF. It should be smooth and bearable, like a cat purring. My octane rating and drivability training stems from the my days with DuPont (in support of lead in gasoline) and Lubrizol (in support of multifunction gasoline additives). Say your engine is ticking like a time bomb, especially in the morning when it’s cold. In a new diesel engine the rings need time to seat properly and develop an air-tight seal. The moral of the story is simply to pay a little more now to maintain your vehicle rather than spend a lot later to fix it. My mechanic always told me not to worry about it, but I never knew what was making the sound. Two possibilities here, big end bearings or pre ignition. Is your engine making an annoying knocking, pinging or rattling sound when you accelerate. It could be coming from the accessory belt. Forum for Engine, Exhaust, Drivetrain, ECU. By injecting raw fuel into extremely hot compressed air, the fuel ignites as the piston is still traveling up in the cylinder, causing a detonation and subsequent rattling sound to be heard. When I use CNG with factory (gasoline) ignition timing, the drivability had 300 demerits with very poor hesitation, acceleration and fuel economy. Now, metal is riding on metal, wearing the surfaces and widening the clearances. As the cost of fuel rises, diesel engines are being fitted into an increasing amount of passenger vehicles due to superior fuel efficiency. This all sounds dire. The rule of thumb calculation to set the increased spark advance over OEM for CNG is 120-87=33/(1.5–2)=22–33 degrees. When sudden and violent knock are experienced in a petrol engine, these knocks are termed as “Detonation”. The timing advance unit has a maximum of 33 degrees advance over OEM. In certain conditions, they can clash with the upward-moving piston. Belt Tensioner Replacement. Also when I told the timing advance manufacturer he advised to use a lower timing advance setting to be more conservative. The stress on your car while you accelerate can draw out noises you wouldn’t otherwise hear. As you may know, people have look numerous times for their chosen books like this engine knocking noise when accelerating, but end up in harmful downloads. 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