As an automotive expert with years of experience in the field, I can provide a comprehensive answer to what happens to a car when you redline it.

Redlining a car refers to the act of revving the engine to its maximum RPM limit, which is indicated by a redline on the tachometer. This is typically the point at which the engine is operating at its peak performance, but it also comes with certain risks and potential consequences.

Firstly, it's important to understand that engines are designed to operate within certain RPM ranges. Pushing the engine to its redline repeatedly can lead to excessive wear and tear on various components. The high RPM can cause increased friction between the moving parts, which can lead to premature wear of the piston rings, bearings, and other internal components.

One of the main concerns when redlining an engine is the risk of damaging the valve train. The valve train consists of the components that open and close the engine's valves, including the camshaft, lifters, pushrods, and rocker arms. At high RPMs, these components are subjected to significant stress and can suffer from accelerated wear. This can lead to issues such as valve guide wear, lifter failure, or even bent pushrods.

Another potential issue when redlining is the strain placed on the transmission. The high RPM can cause additional stress on the transmission's gears and components, which can lead to premature wear or even failure. This is particularly true for manual transmissions, where the clutch can also be subjected to increased wear due to the high RPM.

In extreme cases, redlining an engine can even result in catastrophic failure. This can occur if the engine is pushed beyond its design limits, leading to components such as the pistons, connecting rods, or crankshaft failing. Such a failure can cause significant damage to the engine and may require a complete rebuild or replacement.

It's also worth noting that redlining can have an impact on the engine's longevity. Repeatedly operating an engine at its redline can lead to a shorter lifespan due to the increased wear and stress on the components. This can result in the need for more frequent repairs and maintenance, as well as a reduced overall lifespan of the engine.

However, it's not all doom and gloom. Modern engines are designed to be quite robust and can handle occasional redline operation without issue. Many engines are equipped with rev limiters that prevent the engine from exceeding a certain RPM to protect it from damage. Additionally, some high-performance engines are specifically designed to handle high RPM operation and can do so safely within their designed limits.

In summary, while redlining a car can be an exhilarating experience, it's important to be aware of the potential risks and consequences. Occasional redline operation is generally safe for modern engines, but it's crucial to avoid doing so repeatedly or under conditions that could cause damage. Regular maintenance and adhering to the manufacturer's recommended operating guidelines can help ensure the longevity and performance of your engine.

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Effects on an Engine When You Redline. ... Sometimes you'll be saved by the rev limiter, but it is possible to cause unnecessary wear to the engine, at the very least. You may also risk doing damage to other components like the valve train and transmission, or blowing your engine.Aug 12, 2016read more >>