Ventile/Injektorenrasseln CAAC 2,0 CRDI 103 KW | Posts 32+

Counter-example, please? My 1.4 HDI, a 1.4-liter four-cylinder engine with eight-valve technology and common rail injection, sounds harsher and more clattery in the 206 body without the cover above the engine. I agree with the statement made above that this thing dampens high-frequency noises. I have rarely driven without the lower engine compartment cover - at most, short distances. The idling noise is consistently much louder without it; when the vehicle is moving, the noise somehow disappears. However, sound reflections in tunnels, under bridges, or in areas with dense buildings next to the road (glazed bus stops, billboards, etc.) are considerably louder than without the cover. Overall, the noise from passing vehicles is likely to be significantly louder - even if you don't necessarily perceive it as disturbing from inside the vehicle. For me, these components, which also dampen noise, are definitely significant details in the overall concept of noise reduction.

I'm familiar with the "Dense Development" scenario.
Sure, in the summer, with the windows down.

Then I can hear my turbocharger more clearly than the sounds of combustion.

I can try a test.
Idle speed with and without the baffle on the digital camera - although it sounds different to a human ear.

m;

I've only noticed the running noise of the turbine in the sound profile for about 10,000 km. The cause is the removal of the intake noise silencer and the relocation of the intake to a cooler area. It's more than just a slight hissing sound when revving up, and occasionally you can hear the engine idling, for example, when parking. However, it's not excessive, which is why I considered the modification acceptable.

"...is surely more than just 'pedestrian protection when hitting the hood'." Our old T5 also doesn't have a cover, because the engine only starts 25cm below the hood...

Aurally, I don't notice any difference in my Golf, not even subjectively when the hood is open.

Hello!

For the T5 GP, there are no covers on the cylinder head. There is plenty of space between the hood and the engine; a hood would likely not cause any problems here. Only the air hose runs diagonally across the cylinder head. However, only the developer can probably assess the aerodynamics in the engine compartment. The turbo is located very low, between the engine block and the injection nozzle, followed immediately by the particulate filter. But there is so much space that you could comfortably step through with both legs on either side . Therefore, there is enough airflow.

The lower engine protection plate is the same for all T5 GPs. The hood is already factory-fitted with a cover. There is a piece of molded foam between the valve cover and the fuel injection lines, so a little bit has been done . However, the ticking sound of the injectors is quite audible.

As I mentioned before, I have a valve cover from another 2.0 CR engine. While it also has the opening for the oil filler cap on the right side, the position of that opening probably won't fit either. The ball mounts for the rubber buffers of the valve cover bracket are present on the cylinder head cover, but on the transmission side, this ball mount has already been "repurposed" for the bracket of a hose. The other two mounting balls can be installed later, but the valve cover will need to be modified/cut to fit. I've decided to go with a valve cover that has air vents.

Let's see what's possible. If the acoustics don't improve, this thing will be immediately removed .

Greetings,

Peter.