Granatelli, Indy 500-winning car owner, dies at 90

[Zorro]

6. And he also sponsored the Parnelli Jones turbine-engined 1967 Indy entry

That powerplant was so dominant during the race (only to fail a few laps from the finish because of a transmission bearing failure) that the powers that be immediately restricted turbine air intakes to eliminate that technology from competitive racing.

They wanted to hear piston whines instead of turbine whooshes at the races.