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Old 10-23-2010, 04:17 PM   #30 (permalink)
aerohead
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straighteners/sealing

Quote:
Originally Posted by max_frontal_area View Post
10-4 on the hood, for me that would be a pita, sompin is always being tweaked under there...

cab/aeroshell gap, yes the flex was ovious, but with your clever sourcing of materials i recon you could have come up with something there as well!?

the grille-block inlet valve is manually adjustable from the driver seat?
you might find that at just the right setting it will cool your intake air
like a carburetors venturi.

on my turbo... it seems most streamliner designers haphazardly place engine air inlets figuring at over 200 mph there will be plenty of air for the engine
only to find they are starving it. some of the brighter teams look into tuning their scoops to work like venturies, effectively cooling their intake charge
and packing more air in the engine.

and that is what i am hoping to achieve but with a vehicle that is not quite as sexy.
yes, i intend to mildly dimple (golf ball) the compressor involute of my turbo
with a small ball nose end mill to introduce xtra mass, and fit it with a housing and duct which will supply cool air from the stagnation point.
i have read that pre turbo water injection is supposed to be quite effective,
however too much water won't flow well through intercoolers!!
yes ppl spray their intercoolers with water although i doubt they are using distilled h2o.
the hip way for racers is to blast it with bottled co2 - much more effective.
but no chance of gettin into green heaven with that method.
traditionally, the additional cooling of the IC is only needed during continued
boost.
i have a slightly different twist in mind, the idea is to supply a the max cool air to the turbo and keep it cooled along the way to the combustion chamber thus maxing out volumetric efficiency (on a 30some yo engine design) so that the turbo is always producing boost. secretly hopin for 5 psi.
the idea is to significantly lower rpm's therefore increase mpg by buring fuel more completely as well as reducing recipocating and parasitc losses - all the while extending engine life. best of all i can go to work without having to fool
computers or sensors

forgot to ask, on your grille-block inlet are you using airflow straightners
between the inlet and the radiator or is the air wild? takes lots of energy
forcing dirty air through lil fins. main reason why i dislike pusher fans.
also is your radiator sealed on its outer periphery, lots of cooling air is wasted
flowing around it, if you adress that you could effectively close your "valve" a bit more.
never cared for the looks of the t-100. i do now!
The original grille is still inside there for turbulence and distribution to the heat exchangers.
The inlet is sealed to ensure that the air is delivered only to the heat exchangers.
The valve is fixed at 'wide-open.' After the pick and shovel work is done,and if the truck survives that long,I'll get around to some of the 'fun' stuff,doing the 'active' aerodynamics.
I recall carburetor icing issues with my 1st VW after deleting the heat-riser on the intake manifold,so the venturi effect is certainly real.
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