reelrazor wrote:Genesis wrote:Right it works similar in a car tbi, but thats computer controled injection. The YZF carbs are carbs not computer controled injection... right? So what if the TPS was eliminated? What would it hurt.... could you use the YZF carbs w/o? Just curios. Because the head is better.... right? Would the carbs have to be so detuned would it even make it worth it?
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I don't think there is any real difference in the head, definately not in teh combustion chamber itself. But, the YZF intake ports are oval-ish, at least at the upstream end..which makes them larger, which in my opinion is detrimental to intake velocity.
from about when the first gen YZFs came out until about 2004, 600 intake ports got smaller and smaller(volume) and yet power went up. This tells me the manu's got seriously interested in charge velocity vs. raw flow....they haven't gone back to the large volume paradigm...tells me velocity is more important than huge static flow rates.
Would a port and polish bring the fzr up to the yzf head? Or does the ovalish shapes out do the fzr no matter what? Continuing that line of thinking, would a port and polished yzf head be too much static flow and not enough volocity?