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AN-20 are plenty for the radiator hoses, I use AN-16 and
Tracy used two 5/8" dia hoses (parallel). So that should not adversely
affect your cooling.
Be aware that HVAC ducting is generally not dealing with
air flows that they have to slow down from 160 + MPH. While I do not
pretend to be HVAC knowledgeable - the environment and conditions are different
- that is not to say there may not be good ideas there - just a different
environment.
You may find that taking the engine air inlet out of the
cooling plenum area (at least for the moment) and concentrating on getting
the airflow moving into your radiator might be worthwhile. You have more
than enough cubic inches like somewhere around 700 cubic inches. My two GM
cores have 9x10x3.5 @ 2 = 630 cubic inches, so I don't think its the
capacity of your radiator, its big enough so that even if your lose an effective
70 cubic inches due to exit air being impeded, It should still be big
enough.
As mentioned by others, improving the air exiting will pay
benefits as well. However, I found that in the real world when I
tried to put an exit duct to aid in air leaving the radiator, it has
so many crooks and turns that it actually ended up hurting cooling and was
removed.
Sometimes, there seems to be no recourse but to try
several different things. I got incremental improvement with the first 4
changes I made, but it was not until the 5th change that I got a significant
improvement in cooling. It probably won't take you that many - but, it
could.
Ed
----- Original Message -----
Sent: Monday, May 28, 2007 11:58 AM
Subject: [FlyRotary] Cooling
Recommendations
Rotary Group,
Thanks for the suggestions - questions etc.
Questions and--- maybe answers
Oil pan clearance.
The
oil pan is a flat bottom Renesis stock pan . In the first picture sent
5/27 it is about level with the white motor mount tube under the engine.
At the front it is about 2 inches from the radiator surface. At the back
it is about 8 inches above the radiator. The pan only covers some of the
water rad. and none of the oil rad. I get better cooling on the water
side so I don't believe it is a problem.
Duct shape.
My James
cowl inlet ended about 3/4 inch inside the opening. I added foam and
glass to make a smooth transition to the bottom and sides of the cowl.
Air entering near the top of the inlet either turns up about 90
deg.within 2 inches of the inlet to the air filter or goes straight back to
the radiator. I don't like this arrangement but don't know how much the
turbulance contributes to poor cooling. My first attempt to improve the
top inlet flow made cooling worse so I am looking at other areas
now.
Water hose may be restrictive.
The hoses in the first 5/27
picture are oil lines to the oil cooler. An-10 to the cooler and AN-8
back to the engine.
The water coolant hoses are AN-20 not shown because
they are behind and on the other side of the engine.
Turnning Vane
construction.
I can easily construct a support that bolts to the bottom of
the cowl. This may be able to be installed through the inlet without
taking the bottom cowl off.
I have not found much information on flow
turning vanes in either the K&W Chapter 12 or Hoerner's Fluid -Dynamic
Drag. Probably need to look at HVAC duct design
information.
Dennis H.
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