Porsche MA 120 Engine 2.9 Horizontal Opposite Cylinder Sequence

The order of horizontally opposed cylinders of Porsche MA 120 engine 2.9 is: 1, 3,5 on the right, 2,4,6 on the left. Ignition sequence is generally: 1-4-5-2-3-6.

Horizontally opposed engine put cylinders on both sides of the engine, two or three on each side. Because the cylinders and pistons of the engine are evenly distributed on both sides of the crankshaft and move in the horizontal direction, the overall height of the engine will be reduced, thus reducing the center of gravity of the car. In this way, the car will be smoother and smoother when driving at high speed.

The advantage of horizontally opposed engine is that it reduces the center of gravity of the front of the car and increases the stability of the car when driving. And because of the symmetrical layout in horizontally opposed engine, the engine runs more smoothly, which improves the comfort of drivers and passengers to some extent.

Advantages of horizontally opposed engine

The center of gravity of the horizontal engine is relatively low, so the stability of the car when driving is higher. Because of the symmetrical layout, the engine runs more smoothly.

Horizontally opposed engine's shortcomings

The manufacturing process in horizontally opposed engine is more complicated and the cost is higher, so the later maintenance cost is also higher. Moreover, due to the location of the exhaust pipe, horizontally opposed engine basically can't be made into a horizontal front layout.