This is something that I’ve been meaning to write about for a while – the exhaust silencer (muffler) fitted to the 360 is quite a piece of engineering. The silencer does a great job of keeping the sound levels down, that is until the exhaust tip valves open and then the full glory of the V8 engine is unleashed.
Firstly I’d like to show some pictures of a silencer with the outer skin removed. The main body of the silencer is wrapped in a solid white heat insulation which is then covered by a thin skin of stainless steel. Over the years the white insulation breaks down and escapes from underneath the outer skin – the dust covers the entire engine bay. Although unsightly, the exhaust silencer will still operate properly.
Here are a couple of pictures showing the outer skin removed and the broken down white insulation:
The silencer is made up of five chambers, here’s a picture of one with the top cut open;
Let’s look at how the silencer works when the valves in the exhaust tips are open. The only chamber in use is the large central one – the gases enter the chamber from each catalytic converter and then exit directly into the outer exhaust tips. Here are two pictures with the under side cut open, I have drawn some arrows to show the flow of gases:
Since the engine is in a V configuration the pulses of exhaust gas fire from one side and then the other. This means that the pulses can cross over each other inside this chamber and escape easily through the other side.
Now when the valves in the tips are closed the gases cannot escape out of the central chamber easily in this way. What happens is that the pressure in the chamber builds up and the gas escapes into the two inner chambers via two pipes. The gas enters these pipe through very small holes and allows the back pressure to build up.
The gases are then passed into the outer chambers via two short pipes:
Finally the gases are sent out to the tail pipes on the opposite side via two long tubes:
This complex arrangement provides good sound level reduction but comes at a significant weight penalty – the box weighs in at around 30kgs!
For reference, here is a gallery of photos that I have of the inside of the silencer:
- Ferrari 360 & F430 Remote Control Exhaust Valve
- Ferrari 360 Phase Variator (aka Variable Valve Timing)
- Ferrari 360 Slow Down
- Converting a Ferrari F430 Exhaust to fit a 360
Other posts in this category: Engine & Drivetrain
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