The engine problems that hit Will Power’s Penske-Chevrolet at the start of the Road America race and on Wednesday in the Iowa Speedway test were unrelated, according to Rob Buckner, Chevrolet’s racing program manager for IndyCar. Power, starting from the front row for last weekend’s Road America round, felt his engine running rough on the pace laps and fell back as soon as the race started, needing to pit for several laps before retiring.  Buckner told Motorsport.com on Tuesday that the problem “appears to be an ignition system issue. Unburned fuel in the exhaust system was lit off abruptly by adjacent cylinders, leading to a header failure.” In response to the #12 Penske’s...
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