Practice and Time Trials
The 1968 Indianapolis 500 was the second and eventually the final year of participation by the controversial STP Granatelli Turbine machines. For 1968, the Pratt & Whitney turbine engine was installed in the Lotus 56 chassis, often known affectionately as the "Wedge Turbine." In a veiled effort to curtail the turbine's power output, USAC had imposed revised regulations regarding the maximum annulus inlet (reduced from 23.999 in² to 15.999 in²).
Mike Spence was fatally injured after a crash in turn one on May 7. A tire broke off his Lotus "Wedge" Turbine and struck him in the head. He died of his injuries a few hours after the accident after being taken to the hospital. Spence's death came one month after Jim Clark's at Hockenheim. Clark was scheduled to drive one of the Lotus Wedge Turbines at Indy.
Read more about this topic: 1968 Indianapolis 500
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