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Dennis,
Sometimes a picture is worth a thousand words (and other
times not {:>)), but here are some of my thoughts on your cooling
situation.
Here is what I think may be the problem
areas:
1. Top part of radiator appears to have its exit
area impeded by motor/oil pan. There air flow through this part of your
radiator is probably less than idea.
2. I can not tell from your photos but I suspect the
duct may not be optimized for minimizing separation or turning the air flow for
better entry into the cores.
3. Diverter at the lip of you inlet will almost
certainly cause perturbed airflow in the upper part of the duct and may affect
the lower duct as well particularly at climb attitudes.
So here are some suggestions - only you can decide what
seems worthwhile to you.
Here is a rough sketch DHDUCT.jpg of what I believe may be
a suitable duct profile for you installation. The outermost green lines on
top and bottom is the outside wall profile of the proposed duct. The inner
green line represent my idea of what you divider should approximate. Note
that the lip of the divider does NOT go all the way to the mouth of your
inlet.
Here are some of my thoughts behind it.
First, due to the relatively poor air flow you are
probably getting at the upper end of your radiator (due to blockage by
engine/oil pan/ mount etc, you do not want to "waste" much of your airflow
trying to push it through there. Some - yes, but I think focusing on
getting the majority of your air to flow through the "good" part of your
radiator is crucial.
I would divert no more than 1/4-1/3 (at most) of the air
flow to the upper part where I have the smaller of the diversion channel
drawn. Lets use the bulk of the air through the part of your radiator that
has a better exit path. That is why the lower diversion chamber is
the larger of the two.
The curves of the duct/divider before the core is
important. It will tend to help curve your airflow so that it enters the
core/holes in a straighter line - at least some of it.
This is fairly important - the divider is not started at
the entrance but should start approx 1/3 of the distance from you inlet (in a
straight line) to your core. The reason for this is if you put the lip of
the divider in the mouth of the inlet, you will surely get disturbed airflow in
the duct - particularly in a climb attitude.
I sketched in "Diverter Air flow.jpg" what is likely
happening to you air flow with the diverter. Figure 1 is straight and
level and assuming your air diverter is parallel to the air flow. Figure 2
shows what you would like to have happen - the air nicely curves around and into
your duct at any attitude Figure 3 shows what is likely to be happening if
the entering air and your diverter are not parallel (particularly like in
a climb). The sharp edge of the diverter in the mouth of the inlet is
creating vortices which is adversely affecting the flow in the upper part for
sure and may be also affecting the flow in the lower part of your
diverter.
That is probably the primary reason (in my opinion)
your cooling got worst after putting the divider in.
By putting the lip of the diverter back in the inlet
further,your are letting the airflow into your duct stabilize for a distance,
the divider will then see the air (or vice versa) at nearly a straight on angle
(in other words the divider will stay parallel to you duct airflow) more or less
independent of the angle of your inlet to the air flow (at least in
theory). Also, if possible put some rounding on the lip of the diverter -
sharp edges are very likely to cause vortices.
These thoughts are just that - SWAGS as to what might be
the problem and what you might try to do about it.
Hope it helps
Ed
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