[Shotimes] about the intake

[Eric Keller]

All this talk about porting intakes has me bothered
about one detail.  When I took off the crossover tube
on the DIS side for the first time, it bothered me a
lot to see that the long runners were extended into
the center of the intake.  Do all Gen 1/2 have these
extensions?

Now, when I was but an undergrad, the mechanical
engineering department had this experiment involving a
2 cycle gas engine with rubber hoses for an intake. 
You were supposed to find out which rubber hose made
the engine run best.  None of them made any
difference, because they never tuned the motor.  But
in class they explained that the intake length
determines its resonant frequency, and you want to
match that to the speed you are interested in.  

So when I looked into the intake and saw those pieces
of tubing sticking into the middle, I assumed that
they couldn't figure out how to make the long runners
long enough to work at low rpm's and lengthened them
with the tube inside the plenum.  But, it seems like
they would really make a mess out of the airflow,
dwarfing the effect of any mismatch between the heads
and the intake.

Any thoughts?  Barring that, any comments?
Eric 



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