a second torque characteristic defined by curve b selective actuation of the valve 22 c between open and closed positions may allow the engine to exhibit a third torque characteristic defined by curve c that takes advantage of the increase in torque output provided by the first operating characteristic during low engine speeds and high engine speeds while also taking advantage of the torque output provided by the second operating characteristic during mid range engine speeds to reduce the effects of the above described reversion phenomena more particularly for the engine to exhibit the third torque characteristic and follow curve c the valve 22 c is selectively controlled according to engine speed to cause the engine to switch or transition between exhibiting the first torque characteristic and exhibiting the second torque characteristic for example the valve 22 c may be actuated from an open position to a closed position in a first crossover region designated r 1 in fig8 the first crossover region r 1 may be centered about a first intersection or crossover point designated p 1 of curve a and curve b crossover point p 1 correlates with the engine speed at which the engine outputs substantially the same amount of torque whether it is exhibiting the first torque characteristic or the second torque characteristic as shown in fig8 crossover point p 1 occurs at about 3800 rpm and the crossover region r 1 may extend between about 3600 rpm and about 4000 rpm however differently configured engines may exhibit different torque characteristics than those defined by curve a and curve b as such crossover point p 1 may occur at a higher or a lower.