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>> I'm going to try to solve the scoop question once and for all over the
>> next few days. I've begun rigging up a pitot tube in the rear portion of
>> the scoop to measure the velocity pressure at varying speeds.
>I assume that's one of those "L" shaped tubes that fluids guys love
>that'll tell you which direction the flow is, too. ;-) I don't
>suppose we could get a graph of airspeed (positive AND negative)
>in the scoop versus vehicle velocity...
I found myself musing about the scoop flow/heating problem in general.
Would there be any value in solving both at once by venting the bottom of
the IC to underneath the car?
/ \ existing scoop
/| |\ existing gasket
| | existing I/C
\| | | |/
/ | | / hypothetical I/C lower manifold
--- --| |--
/ / -------
| / | |
I/C vent exit | | | |
tube | | turbo and outlet
It's not like there's much area in the scoop inlet, or through the
I/C -- a flattened duct might have a chance to route through by the
exhaust downpipe if the A/C hoses were gone. By routing the duct to
below/behind the firewall, you might get out of the negative pressure
area and encourage airflow through the I/C the right direction.
If the I/C lower manifold were insulated, then you might also avoid some of
heat soak from the exhaust side as well. Eh, probably not; by the time the
whole compartment warms, up, anything on the top is going to be cooking,
insulated or not.