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Message: <blockquote data-quote="lilvee" data-source="post: 1794934" data-attributes="member: 9652">Here's a nice summary of resonance tuning using ram theory for an IM :Originally posted by Jim McFarland" Every physical system has one or more "natural vibration" frequencies that are characteristic of that system . An organ pipe is a common example of how a resonant condition is displayed. Based upon the physical dimensions of an organ pipe, a flow of inlet air may produce a resonant tone or pitch.Changing the pipe's dimension, given the same amount of input air, could produce another resonant point or tone. With regard to an engine's intake {or exhaust} system, it is possible to dimension a passage to accommodate specific cylinder displacements and engine speed so that a "resonant" condition helps produce an increase in total air flow {intake or exhaust}. In it's simplest form, this amounts to "tuning" an inlet {or exhaust} passage. Physical dimensions of the passage are constructed to provide a resonant tuning point {particularly relative to rpm and valve timing} at which a "boost" in flow is produced. This results in an increase in cylinder filling {volumetric efficiency} and potential gains in torque ".Notice that with invididual throttle bodies (ITB's) you lose this resonance effect because the reflected wave escapes out into the engine bay (or the atmosphere) and is not stored and returned by a plenum/acoustic chamber. ITB's do NOT use ram theory to get that extra kick at peak torque because they usually in race form do not have a plenum. In some street ITB's, a plenum is attached for practical reasons (sound deadening and filtering). They rely on very very large amounts of passive cylinder filling based on the piston's effects and use tuned air horn height and tapered diameter (with an S-shaped velocity stack opening) to get the N/A pressure boost effect that I'm talking about.Now many All Motor drag scene in US start to banned this ITB.... ermmmmSorry... for the long post.</blockquote>

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