Question

Why do some cars have very distinctive starting sounds, like VW's W16 engine? Does it depend on the starter motor, or are there other factors involved?

Answer 1

The distinctive starting sounds of cars can be influenced by several factors, including the engine design, the ignition system, and the exhaust system. Here are some key factors that contribute to the unique sound of certain engines:

1. Engine Design: The design of the engine, including its configuration, cylinder arrangement, and firing order, can significantly impact the sound it produces. Different engine layouts, such as inline, V-shaped, flat, or W-shaped engines, have unique characteristics that affect the sound during startup. The number and arrangement of cylinders influence the firing sequence, which contributes to the engine's sound signature.

2. Ignition System: The ignition system plays a role in the starting sound of an engine. The timing and intensity of spark plug ignition can affect the combustion process and the resulting sound. Engines with high-performance ignition systems or multiple spark plugs per cylinder may produce a more distinct starting sound.

3. Exhaust System: The design of the exhaust system, including the number of cylinders, the layout of the exhaust manifold, and the presence of mufflers or resonators, can influence the sound emitted by the engine during startup. The exhaust system helps to shape and amplify the engine's sound, giving it a unique character.

4. Intake System: The intake system, including the air filter, intake manifold, and throttle body, can affect the sound produced during startup. The way air enters the engine and mixes with fuel can contribute to the overall sound of the engine.

5. Mechanical Components: The mechanical components of the engine, such as the starter motor, can also influence the sound during startup. The sound produced by the starter motor itself may contribute to the overall starting sound of the vehicle.

In the case of the VW W16 engine, it is a unique and high-performance engine configuration that consists of two narrow-angle V8 engines mated together to form a W-shaped engine. The firing order, combined with the exhaust and intake system design, contributes to its distinctive sound during startup.

Overall, the combination of these factors, including engine design, ignition system, exhaust system, intake system, and mechanical components, contributes to the distinct starting sounds of different car engines.