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Chevrolet addresses engine changes for IndyCar teams ahead of Detroit GP

2 sources • 1 min read • Latest: May 31, 2026, 3:03 PM

Last updated May 31, 2026

Chevrolet addresses engine changes for IndyCar teams ahead of Detroit GP

Summary

Ahead of the Detroit Grand Prix, at least seven Chevrolet teams have replaced their engines due to a supplier issue. Chevrolet General Motors president Mark Reuss explained that the problem involved a coating issue with the valve and valve guide, which affected engine performance. The announcement came during the IndyCar warm-up session on Sunday. Teams will now look to compete effectively after making these changes.

Source Links

Yahoo Sports Motorsport.com

Key Details

•At least seven Chevrolet teams changed engines before the Detroit GP.
•Mark Reuss cited a coating issue with valve components.
•The announcement was made during the IndyCar warm-up session on Sunday.
•Teams aim to adapt quickly after these significant engine changes.

Latest Updates

3:03 PMYahoo Sports — Chevrolet reveals cause behind flurry of IndyCar engine changes in Detroit
3:03 PMMotorsport.com — Chevrolet reveals cause behind flurry of IndyCar engine changes in Detroit

What they're saying

"
During IndyCar warm-up on Sunday in Detroit, Chevrolet General Motors president Mark Reuss confirmed the root cause of the issue behind a rash of engine changes in the IndyCar garage. "We had a supplier issue with the valve and the valve guide, and it's a coating issue," Reuss told IndyCar on FOX. "And so if you can imagine the valve sitting in the guide with the wrong coating, over time ...Keep reading
— Motorsport.com