<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div style="font-family:Arial;">I agree with measurement. Just remember that truck radiators are designed for going up pikes peak at high speed on the hottest days with the ac in. If you are able to limit loads or go slower on hot days you won't need as much cooling. <br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">I believe one reason trucks are so big is in the past they assumed people would go slower up pikes peak, but some important reviewier decided that was important and now everything gets cooling package that can handle it which requires a big truck. </div><div style="font-family:Arial;"><br></div><div id="sig11221025"><div class="signature">-- <br></div><div class="signature"> Henry Miller<br></div><div class="signature"> <a href="mailto:hank%40millerfarm.com">hank@millerfarm.com</a><br></div><div class="signature"><br></div></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;"><br></div><div>On Fri, Jun 18, 2021, at 04:55, Stephen Offiler wrote:<br></div><blockquote type="cite" id="qt" style=""><div dir="ltr"><div>I haven't done flow calculations in a long, long time, and Fluids was not among my favorite subjects back in school... so with that said, my gut feeling is that Mark's 56% blockage is probably somewhere in the right ballpark but dependent on factors like whether the airflow is laminar or turbulent, maybe Reynold's numbers.... now I'm just spewing stuff I learned 40 years ago. Mostly to say, there might not *be* a good way to calculate this outside of a lab with a flow bench; really, the thing to do is try it, and take measurements. No idea if you can see high-side pressure while on the road but I doubt it. Any readouts for coolant or trans temperatures? <br></div><div><br></div><div>SO<br></div><div><br></div></div><div><br></div><div class="qt-gmail_quote"><div dir="ltr" class="qt-gmail_attr">On Fri, Jun 18, 2021 at 1:03 AM magreer67 <<a href="mailto:magreer67@gmail.com">magreer67@gmail.com</a>> wrote:<br></div><blockquote class="qt-gmail_quote" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204, 204, 204);padding-left:1ex;"><div dir="auto"><div dir="auto">Wouldn't that be 56% blockage and 44% open to flow through?<br></div><div dir="auto">Mark Greer<br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div id="qt-gmail-m_-202123088828031218composer_signature" dir="auto"><div style="font-size:85%;color:rgb(87, 87, 87);" dir="auto">Sent from my Verizon, Samsung Galaxy smartphone<br></div></div><div dir="auto"><br></div><div><br></div><div align="left" dir="auto" style="font-size:100%;color:rgb(0, 0, 0);"><div>-------- Original message --------<br></div><div>From: Cecil Bearden <<a href="mailto:crbearden@copper.net" target="_blank">crbearden@copper.net</a>><br></div><div>Date: 6/17/21 11:34 PM (GMT-05:00)<br></div><div>To: <a href="mailto:at@lists.antique-tractor.com" target="_blank">at@lists.antique-tractor.com</a><br></div><div>Subject: Re: [AT] Airflow calculations of perforated metal for radiator screens<br></div><div><br></div></div><p></p><div>The .188 diameter staggered pattern gives .444 sqin hole area
over a 1 sq in area. So I guess it would result in a 44%
blockage. However it would be tabout 5 inches from the grille and
then the A/C condensor sets about 6 inches back from that. I
think there would be sufficient room to pull air from above and
below. It just may cause some additional drag at high speeds. I
think I will try it and make it easy to remove in case it blocks
too much airflow. I have to do something. Time and ability to
work on this stuff gets more valuable daily...<br></div><div> Cecil<br></div><p></p><div>On 6/17/2021 7:48 PM, Brad Loomis
wrote:<br></div><blockquote type="cite"><div dir="ltr"><div>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. <br></div><div>Brad<br></div></div><div><br></div><div class="qt-gmail_quote"><div class="qt-gmail_attr" dir="ltr">On Thu, Jun 17, 2021 at 5:23
PM Cecil Bearden <<a href="mailto:crbearden@copper.net" target="_blank">crbearden@copper.net</a>> wrote:<br></div><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204, 204, 204);padding-left:1ex;" class="qt-gmail_quote"><div>I
had to wash the A/C condensor and radiator out on my 2011
Chevy truck <br></div><div> yesterday before I could make a trip to pick up some auction
items. I <br></div><div> put the gauges on my a/c system and it showed 35 low and 350
high. <br></div><div> before I did anything I went to the water hose and got it down
to 150 <br></div><div> pretty quickly on the high side. The amount of bugs was
crazy. I will <br></div><div> have to remove the radiator and condensor to get them clean as
there is <br></div><div> no room to get anything in the front or behind the fan. I
have one of <br></div><div> those heavy cowcatcher style grill guards in the front. This
truck has <br></div><div> about 170K miles and has made 3 trips to Alaska, so it may
have more <br></div><div> bugs than usual, but the bugs and thi8stle seeds are terrible
here and <br></div><div> getting worse. I want to put a piece of perforated metal
behind the <br></div><div> grill guard to catch the bugs. If it cuts the air down, it can
still <br></div><div> come in between the screening and the grill. I don't think it
will make <br></div><div> a lot of difference in the amount of air entering the
radiator, but <br></div><div> maybe catch the bugs and fluffy crap in the air... When we
figure <br></div><div> airflow into a home, we cut the flow through a window in half
when a <br></div><div> screen is used. I am looking at a peforated metal with
holes .188in <br></div><div> in diameter and offset centers so it gets the most holes per
square <br></div><div> inch. Does anyone have any experience with this type of
screening or <br></div><div> have a formula to determine if it will cut the airflow too
much. I think <br></div><div> the area behind the grill guard and the grill is wide enough
to keep <br></div><div> from cutting down the air flow. Traveling down the road at
60mph it may <br></div><div> deflect some air around the grill instead of through..<br></div><div> <br></div><div> I just don't want to have to remove this radiator again. I
have to use <br></div><div> a stepladder to work on the d&%$^d thing it is so tall.
It is stock for <br></div><div> that year, but the manufacturers want to see how far the
drivers can <br></div><div> jump to get into a pickup nowdays. I remember a 63 and 66
chevy 1/2 ton <br></div><div> pickup we worked out of on the farm every day. Hauled 20 head
of cows <br></div><div> in a bumper trailer with no brakes into OKC Stockyards.
Loaded 60 <br></div><div> bushels of wheat to haul to the elevator when the lines were
long and <br></div><div> the grain truck had not returned. Now, I have a 3/4 ton that
I have to <br></div><div> jump into or pull myself in with the steering wheel and 30
bushels of <br></div><div> rye in the bed causes it to squat, with twice as much tire
under it than <br></div><div> the old ones had.. It doesn't ride all that much better,
just cooler <br></div><div> when the A/C works. OK rant off.....<br></div><div> <br></div><div> Cecil<br></div><div> <br></div><div> _______________________________________________<br></div><div> AT mailing list<br></div><div> <a href="mailto:AT@lists.antique-tractor.com" target="_blank">AT@lists.antique-tractor.com</a><br></div><div> <a rel="noreferrer" href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com" target="_blank">http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</a><br></div></blockquote></div><div><br></div><pre>_______________________________________________
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