{TAIL ~ The pistons} are connected to a crankshaft via two connecting rods which are pivotally connected to {HEAD ~ the same crank pin} 
{ TAIL ~ The pistons } are connected to a crankshaft via two connecting rods which are pivotally connected to { HEAD ~ the same crank pin }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD