Tilted angled engine? I am not familiar with CRJ's but I can tell you that tilted engines on aircraft are common. They are tilted to offset the torque. Like a helicopter has the rotor blades to combat the torque effect, a jet engine has tilted engines to offset the effects of torque. This is why on the right engine on a B757 the engine oil sight glass is pretty accurate, whereas on the left engine, due to its tilt compensation, the readings for the engine oil are going to be full before the oil makes it to the full index mark.