Oh no! This length had a very pronounced purpose.
At 9000 rpm you need about 40cm on hot valve timing, so I guess those 2' were about right for 4500 rpm and street timing.
4-bangers follow different sets of rules. My 2-stroke piston ported racer had about 10" induction tract length for 10,000 to 15,000 rpm power range. I won't reveal induction angle, but it shows how long these tubes need to be to be beneficial. (hey, I like the (to be)^2 !!
ORIGINAL: Tony Hallo
Wonder how many out there remember the old VW intakes? Those were maybe 2 foot long from the carb to the head, I don't think tuning was considered back in those days, just made things fit where they may.
There was an article on IMAA web site from the early 80's that suggested 7" was the best length, they changed the site however and I can find it. Heck, I don't even know if was accurate. Good conversation anyway.
Pe,
I would expect the rotary disc would exhibit similar characteristics as the port timed engines, only differenting in that the timing can be assymetric.