<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body dir="auto"><div dir="auto">Brad, I think the removable screen on a 425 or 445 is the same as your 455. As I recall they are woven wire type. If you need dimensions I can measure mine</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div id="composer_signature" dir="auto"><div style="font-size:85%;color:#575757" dir="auto">Sent from my Galaxy</div></div><div dir="auto"><br></div><div><br></div><div align="left" dir="auto" style="font-size:100%;color:#000000"><div>-------- Original message --------</div><div>From: Brad Loomis <brad.loomis@gmail.com> </div><div>Date: 6/17/21 5:49 PM (GMT-08:00) </div><div>To: Antique Tractor Email Discussion Group <at@lists.antique-tractor.com> </div><div>Subject: Re: [AT] Airflow calculations of perforated metal for radiator screens </div><div><br></div></div><div dir="ltr">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.<div>Brad</div></div><br><div class="gmail_quote"><div class="gmail_attr" dir="ltr">On Thu, Jun 17, 2021 at 5:23 PM Cecil Bearden <<a href="mailto:crbearden@copper.net">crbearden@copper.net</a>> wrote:<br></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">I had to wash the A/C condensor and radiator out on my 2011 Chevy truck <br>
yesterday before I could make a trip to pick up some auction items. I <br>
put the gauges on my a/c system and it showed 35 low and 350 high. <br>
before I did anything I went to the water hose and got it down to 150 <br>
pretty quickly on the high side. The amount of bugs was crazy. I will <br>
have to remove the radiator and condensor to get them clean as there is <br>
no room to get anything in the front or behind the fan. I have one of <br>
those heavy cowcatcher style grill guards in the front. This truck has <br>
about 170K miles and has made 3 trips to Alaska, so it may have more <br>
bugs than usual, but the bugs and thi8stle seeds are terrible here and <br>
getting worse. I want to put a piece of perforated metal behind the <br>
grill guard to catch the bugs. If it cuts the air down, it can still <br>
come in between the screening and the grill. I don't think it will make <br>
a lot of difference in the amount of air entering the radiator, but <br>
maybe catch the bugs and fluffy crap in the air... When we figure <br>
airflow into a home, we cut the flow through a window in half when a <br>
screen is used. I am looking at a peforated metal with holes .188in <br>
in diameter and offset centers so it gets the most holes per square <br>
inch. Does anyone have any experience with this type of screening or <br>
have a formula to determine if it will cut the airflow too much. I think <br>
the area behind the grill guard and the grill is wide enough to keep <br>
from cutting down the air flow. Traveling down the road at 60mph it may <br>
deflect some air around the grill instead of through..<br>
<br>
I just don't want to have to remove this radiator again. I have to use <br>
a stepladder to work on the d&%$^d thing it is so tall. It is stock for <br>
that year, but the manufacturers want to see how far the drivers can <br>
jump to get into a pickup nowdays. I remember a 63 and 66 chevy 1/2 ton <br>
pickup we worked out of on the farm every day. Hauled 20 head of cows <br>
in a bumper trailer with no brakes into OKC Stockyards. Loaded 60 <br>
bushels of wheat to haul to the elevator when the lines were long and <br>
the grain truck had not returned. Now, I have a 3/4 ton that I have to <br>
jump into or pull myself in with the steering wheel and 30 bushels of <br>
rye in the bed causes it to squat, with twice as much tire under it than <br>
the old ones had.. It doesn't ride all that much better, just cooler <br>
when the A/C works. OK rant off.....<br>
<br>
Cecil<br>
<br>
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