Author Topic: intake/crankcase stuff  (Read 2036 times)

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Offline 1manband

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Re: intake/crankcase stuff
« Reply #40 on: April 14, 2016, 07:49:00 am »
so i worked out the formulas with some different temperatures.

quite a bit of swing when the temperature goes up.

do not know which temp would best represent or mimic real world conditions.

all these formulas use the speed of sound.  but speed of sound goes up as temperature goes up.  this changes things quite a bit.

nagao & shimamoto/engleman did not include a temperature correction.  believe it is important to represent intake tuning as they do.
they used a speed of sound value at 68F (20C).  so will include that.

will also include and use the average runner temp in a separate calc.
lastly will use what blair settled on for thermo calcs and show this.  212F (100C).

somewhere, within those temp ranges is what i believe is happening?

maybe it is like these different exhaust programs, some closer to the mark than others.

will post up what it looks like.
hiatus

 

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