Ok, I understand what a redline is, it's there to make sure the engine doesn't rev past it's safe limit and destroy itself. But, recently I found out that most cars, including my 91 CRX, have a cold redline as well as a hot redline. Or to use more correct terms, a fuel cut-off. My cold fuel cut is at 6,000RPM, where the hot fuel cut is at 7,200 RPM. What I'm wondering is, when the engine is cold, does that 1,200RPM really make that much of a difference? Wouldn't it make more sense to set a cold redline much lower than the hot one? I dunno, I'm curious. Anyone know? Is it for reasons other than mechanical safety? Perhaps it has to do with effective fuel temperature and things like that? thanks