What is back pressure in engine? Why does Engine needs back pressure?
Backpressure refers to pressure opposed to the desired flow of gases in confined places such as a pipe. It is often caused by obstructions or tight bends in a confined space such as an exhaust pipe.Engines do not need backpressure . It is in fact completely inaccurate and a wholly misguided notion.The classic symptoms of too much backpressure include things like a lack of high speed power, poor fuel economy and even overheating. Anything that backs up exhaust pressure into the engine will also back up heat. About a third of the heat produced by combustion goes out the tailpipe as waste heat, so if the heat can't escape it can overload the cooling system and make the engine run hotter than normal, especially at highway speeds.If there is a complete blockage in the exhaust, the engine may start and idle fine for a minute or two, then die as backpressure builds up and strangles the engine. In some instances, backpressure may buildup to such a degree that it blow out a pipe connector or the converter shell.Reducing exhaust backpressure can improve fuel economy and performance. Reducing restrictions in the exhaust system allows the exhaust to flow more easily so the engine can breathe more efficiently. The most common modification is to replace the stock muffler with a low restriction aftermarket performance muffler, or to replace the entire stock exhaust system from the catalytic converter back with a free-flowing aftermarket performance exhaust. So u must focus on keeping your back pressure as low as possible and not try to increase it.
What are the symptoms of a burnt exhaust valve?
The symptom you’re likely to notice the most when you have a burnt exhaust valve is a loss of power from the engine and an increase of fuel consumption as the engine is run harder to do the work expected of it. Other symptoms will be dependent upon how badly burn the valve is. You’ll be looking at a valve job to correct it, or else swap out the cylinder head altogether.When the edges of an exhaust valve burn, the combustion chamber no longer seals and not only do you lose compression in that cylinder, unburnt hydrocarbons will be exiting before they can be ignited.Running an engine low on oil will often burn one or more valves before the main bearings start to pound. Otherwise, a lean fuel mixture can cause this, too.On modern vehicles with a full exhaust system, the sound can be hard to discern. However, a cylinder leakage test will pinpoint it fairly well. Your pressure loss will be fairly high and you’ll hear the pressurized air escaping through the exhaust system, rather than through the intake or the crankcase. If you hook up a vacuum gauge, you may notice a steady loss of vacuum at idle if a valve is burnt or sticking.
Why does dual exhaust sound bad on a V6?
Well, it mainly is the difference between the two cylinders. In a V8, a cylinder fires every time the crankshaft rotates 90 degrees, so it makes that low, throaty rumble. As far as the dual exhaust, well, if you have the same exhaust on a V8 and a V6, you will be able to hear the differences solely from the engines, no matter what type of exhaust they both have. Now, I won't get into specifics with pushrod and overhead cam engines and the like, but basically, several components contribute to what a vehicle will sound like.
Why does my exhaust smell like it is burning?
For the hole. That sounds like the cap. People who race often install exhaust systems with these holes and caps for the holes. They remove the caps before the race so the exhaust bypasses the converter and muffler. The exhaust dumps strait out instead of going through the rest of the system for better exhaust flow and less exhaust restriction allowing the engine to breath easier. Then after racing they can put the cap on again to make it street legal. It could also be for an optional oxygen sensor. Is the hole threaded? Oxygen sensors screw in, so if it does not have threads it is not for an oxygen sensor. If it is threaded, check to see if you have an oxygen sensor that has not been connected. It comes with a cap so it may be optional. It can cause the back pressure to be uneven and then cause a difference in the cylinders exhausting. You should try to get that bolt in. You might just be cross threading it. If that is not it, you may have to chase it with a tap and die to get it correct. As for the Burning. Did you get any oil or any thing on or in the exhaust? Maybe it is the new rubber mounts that hang the exhaust. Could be the new rings wearing in as well. Also check and make sure there is nothing stuck to the exhaust pipe and manifolds that would melt or burn. May just be that new exhaust smell. You could have not taken the plastic coating off (if there was one). Some exhaust systems ship with a plastic coating to protect it from scratches durring shipping. Or if there was any stickers on it. It could be those burning off. Most exhaust systems have a light coat of oil to keep it from rusting while setting in the warehouse. Could be that. A friend had run over a empty plastic bag from a grocery store that melted to the exhaust once. You can check to see if there is any foreign object stuck to the exhaust.
Porsche Carrera Gt Exhaust Sound?
The Carrera GT was designed to be a 'Super Car,' like Ferraris and the like. The sound comes from the exhaust system it has coupled with the fact it's a V10. Other (modern) Porsches are 6 cylinders. Take that, rev it up to 8,400 rpm (redline in that car) and you get that F1 sound you're talking about.
2002 Sportster 1200 Exhaust?
It is a crossover pipe. It lets the exhaust flow through both mufflers instead of just one. It's also supposed to help with cylinder scavenging, but with the uneven firing I don't see how that works. Or maybe it's supplying back pressure, as in the answer I got years ago.....http://answers.yahoo.com/question/index;... Whichever and whatever...I noticed no harm when I removed mine.
Why does the steam turbine exhaust temperature increase in rolling?
A2A. Steam turbines are designed for particular load condition that is rated condition. For example say X mW at X TPH with pressure X kg/cm2.After vacuum pulling, turbine is rolled. It is generally started as per cold start up curve. There is soaking point wherein it is rolled at particular rpm for particular time. This is provided for uniform expansion of rotor as well as casing. Please note, inlet conditions remain same at this point as well. For rated condition, this inlet condition would be same (except flow which varies according to demand). So from this you can make it that enthalpy or say heat energy in steam is fully utilized at rated condition.But unlike at rated condition, during rolling unless turbine is loaded, enthalpy of steam is not fully utilized. So temperature of steam in last stage would be higher (since enthalpy is not utilized). Now at rated speed inlet flow condition is slightly higher compared to soaking period during initial rolling. Also gland sealing is continuously provided at HP and LP glands.So because of this lack of utilization of enthalpy in steam, exhaust temperature goes on rising until turbine is loaded.Once turbine is loaded you will see drastically fall in exhaust temperature.
What is the cause of white smoke from the exhaust and fuel smell?
White smoke and the smell of raw gas out the exhaust. Is a definite sign of running rich.Condensation well mostly disappear. Along with not having the smell of gas vapors. Once the engine reaches operating temp.Are there any check engine lights displaying. From the ECU/PMC throwing a error code. Causing the engine to run limp mode?When was the last time the fuel pressure was checked? Too much will extra gas, pass through the injectors. Much like changing the Injector Pulse Width MAP.A hanging injector will mostly likely cause cylinder(s) to fill with gas. Depending on what intake valves are open, along with intake manifold. The fuel system stays pressurized, even tho fuel pump is shut off. Allowing the pressure to bleed off through the injector(s). By keeping the system under pressure. Allows for quicker starts. Because there is no lag, while the fuel pump rebuilds the lost pressure.Running that rich can/will cause the oil film. On the cylinder walls, getting washed off leading to scuffing.I could see the white smoke, smell the gas. When adjusting fuel pressure on my super charged CRX Sir, may it R.I.P....