At about 0930 Mountain time, the airplane experienced a loss of engine power while maneuvering and subsequently landed on a nearby highway. During the landing rollout, a vehicle collided with its left wing, causing substantial damage. Neither the solo pilot nor the vehicle operator were injured. Visual conditions prevailed. The pilot subsequently reported he spent the previous six months overhauling the engine and adding an inverted oil system. Prior to the accident, he had flown the airplane about 10 hours. On the accident flight, he noted the engine had lost all oil pressure and he was unable to land at an airport. The pilot reported removing an inspection panel on the cowling and observing a connecting rod near the back of the engine protruding from the crankcase.
