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Let me point out that combustion stability perception is kind of relative. When you see a V8 camming, it's having poor combustion stability at idle and low load. It still sounds cool though, even if it's burning poorly.
Likewise when you drive down the road in a modern engine you will have higher instability at part throttle due to dilution with AVCS induced overlap. However it's not unstable enough to notice usually, and you are getting better fuel economy.
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