B7 A4 Engine Loud?
10-26-2008, 12:40 PM
#1
B7 A4 Engine Loud?
I'm looking at a 2005.5 B7 A4. The engine is louder than I expect. Certainly louder than my 2000 S4.
If i stand in front of the car, hood closed, the car sounds almost like a diesel... but not quite that loud. There is a traditional valve tapping sound & N75 valve type sound that I expect from the Audi line. In addition to this, the engine simply sounds louder in general than expected.
Is this difference in volume something I should expect as compared to the sound compared to the 2.7T?
I did notice that the oil was at the min mark. I added some oil to bring the level about 1/2 way up between the marks - but the sound did not change.
Is the B7 A4 a bit noisy from the engine point of view when standing in front of the vehicle? Car has 40K miles.
If i stand in front of the car, hood closed, the car sounds almost like a diesel... but not quite that loud. There is a traditional valve tapping sound & N75 valve type sound that I expect from the Audi line. In addition to this, the engine simply sounds louder in general than expected.
Is this difference in volume something I should expect as compared to the sound compared to the 2.7T?
I did notice that the oil was at the min mark. I added some oil to bring the level about 1/2 way up between the marks - but the sound did not change.
Is the B7 A4 a bit noisy from the engine point of view when standing in front of the vehicle? Car has 40K miles.
10-26-2008, 01:07 PM
#2
It's the FSI (Fuel Stratified Injection)
With FSI technology, fuel is injected directly into the combustion chamber. The injector regulates the amount of fuel with millisecond precision at injection pressures of between 30 and 110 bar. During the injection process, the evaporating fuel has a significant cooling effect on the cylinder charge. This contributes to improved cylinder charging and enhanced engine output. The cooling effect also helps reduce the engine's tendency to knock. This reduction means that the compression ratio of FSI engines can be set considerably higher than for engines with conventional injection systems.
The engines of the FSI family are fitted with a two-stage variable intake manifold. The power mode (short duct length) contributes to the high specific power output of the engines at high engine speeds. At low revs, the long duct length setting is selected increasing the maximum torque by more than 15%.
With the aid of a flap system in the intake duct, the in-cylinder flow can be optimally adjusted. In part-load operation, a strong flow ensures low fuel consumption and low exhaust emissions. At full load, the air is drawn in with minimal losses, meaning that torque and output are increased.
The engines of the FSI family are fitted with a two-stage variable intake manifold. The power mode (short duct length) contributes to the high specific power output of the engines at high engine speeds. At low revs, the long duct length setting is selected increasing the maximum torque by more than 15%.
With the aid of a flap system in the intake duct, the in-cylinder flow can be optimally adjusted. In part-load operation, a strong flow ensures low fuel consumption and low exhaust emissions. At full load, the air is drawn in with minimal losses, meaning that torque and output are increased.
10-26-2008, 08:29 PM
#5
Interesting. I've heard the cam tensioner can make the engine loud.
Today I discussed with a tech, who indicated that the correlation between the engine oil being low and the loud tone of the engine can be a sign that the cam shaft tensioner requires replacement.
IIRC, that's about $700.
Anyone run into this yet?
IIRC, that's about $700.
Anyone run into this yet?
10-26-2008, 08:50 PM
#6
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Re: Interesting. I've heard the cam tensioner can make the engine loud.
If you're looking at this particular car, be aware there are cam lobe wear issues with some of these cars and that Audi has put out an improved, hardened part. There is a TSB out there for dealers to follow to check and replace parts for this issue. It's not a cheap fix if it's not a CPO car and it's your dime. Our B7 2.0T does not make the sounds you're talking about....
