![]() ![]() On either end of the inner shaft is a fan-shaped axial impeller. Rather than a single shaft running between the exhaust impeller and the intake compressor, there are two shafts seated concentrically, meaning one is hollow and rotates independently around the other. What is it and how does it work? For that, we turn once again to Jason Fenske of Engineering Explained.Ī two-shaft turbocharger essentially combines a small and large compressor into one physical unit. One of the more obscure solutions is the two-shaft turbocharger. Over the years, engineers have found ways to realize the benefits of this sort of system without using multiple turbines. The "right" amount depends on the size of the engine, the diameter of the exhaust piping, and the target amount of boost you want to build.Įnthusiasts should be familiar with sequential turbocharger systems, in which a compact turbocharger operates at smaller throttle openings and builds initial boost before "handing off" to a larger turbocharger downstream which only operates efficiently at larger throttle openings, but builds way more boost. The ability of a turbocharger to compress air is dependent on several things, but the key is having the right amount of exhaust flow to spin up the intake compressor. The more air you can get into an engine, the more fuel you can burn with each ignition cycle. Air flowing through the exhaust tube spins its impeller, rotating the shaft and in turn spinning the impeller in the intake tube, which compresses the incoming air. ![]() In a very fundamental sense, a turbocharger is just two tubes with impellers in them connected by a common shaft. More and more, automakers are looking for ways to package turbochargers more efficiently, encouraging engineers to provide the benefits of larger, more complex systems in smaller packages. As turbocharged engines became prevalent in mainstream cars and trucks over the past two decades, the technology has advanced substantially. ![]()
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