I was looking at the specs on my audi a4 and it said 30 valves and I was looking at a few other cars and they said 24 valves. What do the valves determine? Whats the difference if the car has more valves than another?
I'm pretty sure more valves allow a bigger gas to oxygen ratio which in turn creates a bigger combustion in your engine. Basically more valves = bigger combustion= faster. Although, generally cars with less valves (at least European cars) are 4 cylinders with some kind of forced induction (turbo or supercharger) which can make the car faster than a 6 or 8 cylinder car if a decent amount of aftermarket parts are applied to the forced induced car. Sorry for rambling, but aftermarket parts usually have a greater affect on a forced inducted car than just a naturally aspirated car (standard car lacking a turbo or supercharger such as your 6 cylinder a4).