![]() ![]() Until now, taming a 600hp+ BMW meant living with a clutch that was the stereotype "on/off switch" with rough engagement characteristics that made daily-driving a compromise. Developing a class-leading flywheel and clutch technology to even greater heights, the new Twin Disk flywheel/clutch package is designed for BMWs developing the highest levels of power from turbocharging or supercharging. Finally, batteries had to be replaced every other oil change as a result of the car charging its battery only when it coasts, unlike traditional motors that are charged by the turning of belts.Whether your BMW is used for drag racing, drifting, or just embarassing exotic supercars on the street, you need a clutch that can handle the abuse. Fuel injector failure was universal among all engines and deemed a “quirk.” Timing chains stretched easily, causing them to jump a tooth and fail quite often. Excessive oil consumption and leaking valve stems were a result of the turbochargers' location. However, as detailed in the previous section, these engines are not without their share of issues. This led to a dramatic decrease in boost lag since the intake and exhaust path are now much shorter than in a regular “V” engine. By fitting the turbos between the banks, it allows the turbos to be exponentially closer to where the combustion is occurring. Opposite a conventional setup, the ports point toward the center of the engine, which allows the turbochargers to be mounted between the cylinder banks. Simply put, a “Hot Vee” engine has the exhaust ports facing inward. The response however, was less than enthused as a class-action lawsuit was brought about the company shortly after the introduction of the service bulletin.Īlthough the original N63 was plagued with problems, it was a monumental engineering achievement for the fact that it introduced the automotive industry to the “Hot Vee” engine layout, in a production car. Refusing to label the service bulletin a “recall,” BMW allowed customers, in and out of warranty, to have their N63 serviced and replace the necessary parts relating to: the timing chain, fuel injectors, mass air flow sensors, crankcase vent lines, the battery, vacuum pump, and low pressure fuel sensor. It was such a mess, BMW even introduced a “customer care package” to help remedy the situation. ![]() The original N63, classified as N63B44O0 was produced from 2009-2013, and is the lead candidate to be named BMW’s least reliable engine of all time. Other than displacement and the number of cylinders, these engines could not be farther from each other in terms of quality, reliability, and most of all, power output. From 2008 to present day, the only qualities these engines share is the fact that they’re both 4.4-liter Twin-Turbo V8 motors. ![]()
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December 2022
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