Quote:
Originally Posted by Quadcam24
Is there a general rule of thumb for runner lengths, is it shorter or longer for power band higher or lower in the rev range ?
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Not really its based on the duration of the inlet stroke and the speed of the crank. Fairly easy with ITB like this rather than the plenum type as you only have to consider a single cylinder for each runner and not take into account resonant frequencies of other cylinders.
It will be mostly determined by space but even so if you can match them to a desired frequency it will help. Drew seems good with the numbers so just wondered out of intrest as its something Im modelling at the moment.