Quote:
Originally Posted by Jumbosock
My guess (and it is a guess) is that you would have a slight power gain but decreased MPG for normal driving.
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In a "normal" normally aspirated engine, without Variable Valve opening technology, as the rpms increase, the time that the inlet and exhaust valves remain open gets progressively reduced, as such the engine performance is not "optimised" at all rpms and will produce a torque curve with a definite peak. The purpose of the Vanos is to variably adjust the valve opening times to compensate for the increase in rpm so that the torque/power of the engine is optimised over a much wider range of rpms, producing a torque curve which tends to plateau over a few thousand revs and with reduced loss of torque output at peak revs. Therefore, deleting the Vanos alone will not produce any power gains and will actually produce a performance loss at higher rpms