[AT] Airflow calculations of perforated metal for radiator screens

[Mogrits]

Cecil

It should be pretty easy to calculate the blockage...Measure square inches
of the screen you'll use, count holes per square inch, and measure the hole
diameter. Those three numbers will give you the answer you want, and if you
post them we'll tell you if you don't have a calculator handy.

Warren

On Thu, Jun 17, 2021 at 8:49 PM Brad Loomis <brad.loomis at gmail.com> wrote:

> The 455 diesel lawn tractor I use at work has a pull out screen ahead of
> the radiator. I'm not there so I can't measure it. But I will try tomorrow
> and report back. It does keep the foxtails, thistle, mustard, and whatever
> else I kick up out of the radiator.
> Brad
>
> On Thu, Jun 17, 2021 at 5:23 PM Cecil Bearden <crbearden at copper.net>
> wrote:
>
>> I had to wash the A/C condensor and radiator out on my 2011 Chevy truck
>> yesterday before I could make a trip to pick up some auction items.   I
>> put the gauges on my a/c system and it showed 35 low and 350 high.
>> before I did anything I went to the water hose and got it down to 150
>> pretty quickly on the high side.  The amount of bugs was crazy.  I will
>> have to remove the radiator and condensor to get them clean as there is
>> no room to get anything in the front or behind the fan.   I have one of
>> those heavy cowcatcher style grill guards in the front.  This truck has
>> about 170K miles and has made 3 trips to Alaska, so it may have more
>> bugs than usual, but the bugs and thi8stle seeds are terrible here and
>> getting worse.  I want to put a piece of perforated metal behind the
>> grill guard to catch the bugs. If it cuts the air down, it can still
>> come in between the screening and the grill.  I don't think it will make
>> a lot of difference in the amount of air entering the radiator, but
>> maybe catch the bugs and fluffy crap in the air...     When we figure
>> airflow into a home, we cut the flow through a window in half when a
>> screen is used.    I am looking at a peforated metal with holes .188in
>> in diameter and offset centers so it gets the most holes per square
>> inch.   Does anyone have any experience with this type of screening or
>> have a formula to determine if it will cut the airflow too much. I think
>> the area behind the grill guard and the grill is wide enough to keep
>> from cutting down the air flow.  Traveling down the road at 60mph it may
>> deflect some air around the grill instead of through..
>>
>> I just don't want to have to remove this radiator again.  I have to use
>> a stepladder to work on the d&%$^d thing it is so tall.  It is stock for
>> that year, but the manufacturers want to see how far the drivers can
>> jump to get into a pickup nowdays.  I remember a 63 and 66 chevy 1/2 ton
>> pickup we worked out of on the farm every day.  Hauled 20 head of cows
>> in a bumper  trailer with no brakes into OKC Stockyards.  Loaded 60
>> bushels of wheat to haul to the elevator when the lines were long and
>> the grain truck had not returned.  Now, I have a 3/4 ton that I have to
>> jump into or pull myself in with the steering wheel and 30 bushels of
>> rye in the bed causes it to squat, with twice as much tire under it than
>> the old ones had..   It doesn't ride all that much better,  just cooler
>> when the A/C works.   OK  rant off.....
>>
>> Cecil
>>
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