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Message: <blockquote data-quote="Acoustic" data-source="post: 1064525934" data-attributes="member: 728">Did anyone tried the Pipe Sizing Calculator? I found most parameters from Bill Sherwood's website and entered and substitute some numbers that I guessed. Shortest is pipe is some 23cm, longest is 47cm. 6 results in all, due to various conditions / requirements. mostly around 30cm minus minusOur 4 throttle is already 24.6cm. Long, hence adding a velocity stack of 10cm will be mostly enough. For that rev lah.---------- Post added at 05:19 PM ---------- 6 hour anti-bump limit - Previous post was at 05:06 PM ----------I redo the Pipe Sizing Calculator website using 3k rpm and one of the 6 conditions, i.e. shortest length is still 24cm, good lah. But one of the 6 conditions, i.e. longest is 117cm, with 4 others around 60cm +/-20cm. Fuuuu Woorrrr. Surprised!!!!! yet not surprised!!!!!So what rpm we normally use? 4k right!!!</blockquote>

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