I don't know if this is your trouble, but I had the same situation or similar.It was explained to me that the exhaust manifold on maxima's have a tendency to heat up and warp; separating them from the engine exhaust ports and the bolt breaks. I think you need to replace the exhaust manifold. It is a bit expensive having a professional do the job. Well worth the cash. At least to me.
Buy a exhaust with a larger circumference, the larger the circumference, the louder the noise.
fumes in car,louder then normal engine noise,no power (collapsed muffler or clogged catalytic converter, buzzing noise in exhaust. what did i win? g
When Exhaust brake is on squeak noise comes from the engine?"
If its smells like gas, you are putting too much gas in the engine and some is unburnt and going out the exhaust. Exhaust underneath means there is a leak in the system somewhere. If there is no louder noise or hissing, I would expect the catalytic converter is leaking. Have it checked and get a tune up. http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info answer bad exhaust pipe
the ticking noise is a small exhaust leak close to the exhaust headers or exhaust pipe near the engine.
Diesel trains are louder than electric trains because you the noise that the diesel engine makes, which is louder than the electric engine.
I believe that an engine can create a noise underneath the middle of the hood....
If a scooter engine is louder than normal if could indicate one of several problems. You should check the oil level straight away, especially if it is a two stroke engine, as lack of oil, especially two stroke can cause major damage to the engine, and if the engine is running dry it would definitely be louder than normal, and could seize if you continue to use it.The most likely cause of the noise is the exhaust. If a hole has developed, due to rust then the scooter will be much louder than normal. You should visually check the exhaust for any damage. You should also check that the exhaust has not come loose at the manifold (where it joins the engine). If it loose you will just need to tighten it. If there is a hole it will need replacing.You should also take to a scooter dealer or mechanic as soon as possible, as they will be able to find out what is causing the noise, and they will be able to repair it.
Please don't do it. There's enough noise pollution without your contribution.
The design of the engine intake and exhaust can do a lot to reduce noise levels.
That's where the exhaust pipe and the muffler is, maybe yours is damaged.
fan , combustion, and exhaust
exhaust sytem making contact with underside or engine mount damaged/worn, the sound will resonate inside the car but not outside.
check your engine for a cracked manifold (covering of the engine parts and cylinders. also look for any exhaust leaks. it sounds like the exhaust noise isn't making it to the muffler as it should and instead is coming from the engine directly.
the engine the engine
This would require the modification of the exhaust system. The sound of any vehicle comes from the exhaust and not really the engine. A deep "throaty" sound is achieved by streamlining the exhaust system. This will also increase horse power because the engine won't have to work so hard to push the exhaust out thus more power is available to push the truck. If you have no knowledge of vehicles then exhaust modification should be handled by a pro. Keep in mind that some States have emission laws and there are always noise laws to consider as well.
If you are speaking of exhaust noise, repair your exhaust leaks. If you are speaking of engine noise, and it is loud enough that it bothers you, or sounds unnatural, the engine may be damaged internally. An inspection by a mechanic will tell you if your engine is making more noise than it should. regular maintenance such as a tune up and oil change will make your engine run smoother and will reduce noise.
unlike the 2 cycle engines the 4 stroke has intake and exhaust valves with an overhead camshaft so it will be a little louder than a 2 cycle. if your engine is making a lot of noise such as loud tapping you should get it checked to be sure the rocker arms are set properly.
I would say it is the exhaust system.
No, not really. An engine will run without an exhaust (but you may get arrested). The exhaust simply directs waste gasses and quietens the noise. It plays no part in the running of the engine, but can reduce the performance if it causes on obstruction to the gasses.
That would certainly be one of many likely results. The manifold basically carries the exhuast gas and the exhaust noise from the engine itself to the system that "muffles" it. Any cracks let all these things escape.
A knocking noise can occur from worn engine mounts. When the rubber insert on the engine mounts are old and brittle the chassis is not protected from the weight of the engine. Creating loud vibrations that get louder as the vehicle goes faster.
I doubt it. Most timing chains are located in the front of the engine. You may have a loose heat shield around part of the exhaust system.
Increased driving noise under throttle can be indicative of an exhaust or intake leak. An exhaust leak can also give the symptoms of loss of power under throttle. At worse this could be an internal engine issue, and continued driving on the condition risks further damage.