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But, since they are not
interconnected, can not use the DIE equation. However, Here is what the
calculations come out to using just a pipe from intake port out to your throttle
body. I assume from your comment that you don't have a lot of length to
deal with. I further assumed you do want to get some help from Intake
"tuning".
I either have about 28 inches over
to the right cheek, or something much shorter in the left
cheek. If I can work with either of these, and get some intake
tuning out of it, then I'll give it a
shot.
So based on that - it looks like your
length from port to butterfly inlet of TB ranges from 13.1" for 6500 RPM to 11.5
RPM for 7500 RPM. This provides time for the pulse to be generated by the
closing of the port and to arrive after that port opens again after bouncing
back from the throttle body once. So from that Length you would need to
subtract your block to port distance of 2.5" and the length of your throttle
body.
Excellent! This is just
the sort of info I was hoping for, but there's one thing I still don't
understand. When you say the pulse bounces back from the
TB, what is it bouncing off of? I believe the throat of the TB
is straight, with no venturi effect at all, and we'll assume that the intake
runner matches the TB size perfectly. That just leaves
the open butterfly, which has a pretty small
profile. Is it really getting a strong bounce from the open
butterfly? What if you had a slide type opening, like the Ellison TB,
where there is nothing left in the path of the air? Would there just be no
bounce?
Thanks a bunch,
Rusty (special needs
student)
PS- Somewhere, I know I've seen a short intake, that
points straight out to the side, and uses a side draft carb. I've
been looking for that all morning, and can't find it now. Can anyone
point me to one of these? I'm thinking it might make a good starting point
for a left cheek intake. Thanks.
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