04-14-2015, 05:23 PM | #3 |
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Drives: 22 M8C Coupe, 21 X5MC
Join Date: Mar 2012
Location: Atlanta
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From: http://m5carblog.blogspot.com/2013/0...rankshaft.html
The S63 engine, however, uses a cross-bank exhaust manifold that take exhaust pulses from both cylinders banks and feeds them to the turbos, and then out the exhaust for a very smooth exhaust flow. While the crossing over of cylinder banks to exhausts is not unheard of, it requires a complex exhaust manifold, as the exhaust valves are typically on the outside of the V, and crossing them over early is a messy business. Some of the problem can be alleviated with an H or X exhaust that crosses the two exhaust banks over half-way to the tailpipes. This alleviates some of the problem but is still not ideal. In the S63 engine, the exhaust valves are flipped to the inside of the V, and all exhaust directed to the turbos. The exhaust pulses are crossed over right inside the V before they hit the turbos, all in the space of a foot or so, and the smoothed exhaust outputs of the turbos can each go to its own tail pipe. So in the M5 you do not hear the V8 rumble nearly as much as a result of this clever design, and it solves all the efficiency problems associated with the crossplane V8 exhaust.
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