Terry Schrimscher IRONDALE, Ala. — Seventy years ago this month, Art Ingels bolted a lawnmower engine into a steel frame and the first go-kart roared to life in California. To celebrate the invention that sparked generations of recreation and racing fun, K1 Speed in Irondale is joining K1 tracks around the world Friday, Aug. 28, to host an event billed as the “World’s Largest K1 Go-Kart Race.” Art Ingels (seated) and Lou Borelli with the first g…