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.
Please don't do it. There's enough noise pollution without your contribution.
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.
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.
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.