Kyle Busch's engine failures at Darlington and Bristol were related.
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Busch had engine problems in two of the first three races of the playoffs and ended up getting eliminated before the second round because of them. Busch missed out on the second round by two points after he had to retire early at Bristol because of that engine problem.that Busch missed a shift at Darlington and that NASCAR's gear ratios were partially to blame at Bristol.
"We have some sort of an instability in our valve train and it seems to be triggered by us running into NASCAR's mandated rev limiter, interestingly enough," Wilson said. "At Bristol, NASCAR miscalculated the gear ratio. It was too short. When Kyle, particularly when he was running that upper groove in fifth gear, he was hitting the rev limiter, almost every lap. The fact is that right now we just don't have enough durability margin in our valve train. That's on us."
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