High-thrust innovation for ultra-thin pipes.
{{{BMW M}}} GmbH's particular innovative strength in engine construction is also borne out by the production methods used. Indeed, one example dates back all the way to 1992, when BMW M GmbH became the first company to use the inner high-pressure moulding process for the then BMW {{{M3}}} - and since then this process has been consistently refined.
Inner high-pressure moulding serves to shape the seamless stainless-steel exhaust pipes from inside under a pressure of up to 800 bar. The result is pipes with extremely thin walls between 0.65 and 1.0 millimetres (0.0256 and 0.0394). Clearly, this helps to optimise both the weight of the exhaust system and the response of the catalytic converters.
At the same time this sophisticated technology allows moulding and shaping processes previously not conceivable, as well as even better geometric tolerances. And since all primary and secondary pipes are made of one single piece despite their complex shape and dimensions, many of the former connectors and welding seams are no longer required. Similarly, there are no folding points or tight bends changing the cross-section of the pipes. Instead, the pipes retain their maximum cross-section at all points, minimising any flow resistance in the process.
Exceptionally clean and audibly dynamic.
Generally, only racing engines feature a fan-type exhaust manifold leading out of the cylinders. But it almost goes without saying that the new V8 also boasts this technology, the two 4-in-1 fan manifolds made of stainless-steel optimised for consistent length and diameter in elaborate computer processes capitalising on the gas-dynamic configuration of the entire system.
The two catalytic converters - one in each exhaust pipe - are positioned close to the engine. These primary catalysts quickly reach their optimum operating temperature since the thin walls of the exhaust manifolds minimise any thermal inertia of the material while warming up, thus ensuring a very fast response after starting cold.
Two particular features of the catalytic converters are their low pressure loss and the high standard of mechanical strength.
Two additional tri-metal-coated catalytic converters then come further down-stream, integrated in the underfloor of the car. Interacting with one another, the four catalysts clean the exhaust gases very effectively. Hence, BMW M's new V8 power unit fulfils all the requirements of the European EU4 standard and the US LEV 2 classification. Noise emissions are likewise exceptionally low. Apart from the two interim silencers, particularly the single-piece rear muffler in crosswise arrangement with its very large volume of 35 litres serves to reduce the noise level.
The new V8 power unit nevertheless boasts an exceptional sound and audibly sporting character once again typical of BMW M and at the same time offering a unique touch of racing performance for all senses. ...next page >>