[AT] Airflow calculations of perforated metal for radiator screens

Fri Jun 18 00:11:39 PDT 2021

The screen talk reminds me of the nice idea Deere had to vertically flute the screens in front of their radiators on the later two-cylinder tractors. They would catch all kinds of fluff in the grooves, and were sized so you could occasionally drag your fingers from top to bottom and remove fistfuls of the stuff easily when mowing or plowing in a field full of weeds. In the first summer with the 520, quickly learned to use a gloved hand, as some of the trapped plant parts would bite your fingers. 
Sure agree with Cecil on the crazy height of pickup trucks. It used to be SO much easier to get in and out and to put in and remove things from the beds. The zillions of folks buying new ones must love looking down on every one else. If they had to put five hundred pounds of stuff in and out of them every day, that fun would melt at the chiropractor's office. And the short beds on the fancy 70K pickups are a joke. If you have noticed, every time a major mfg. (like VW) makes a smaller, lower, pickup for an overseas market, they take extra care to keep them OUT of the US market. Sure miss a pickup and was going to get one again after a young gal ran a red light a while back and wiped out my perfectly good 2010 Camry. Was very lucky the gal did not wipe ME out. But I bought a ‘15 RX350 SUV for some other reasons. Like it, but it's the same dumb story as the new pickups - has TALL tires, a climb into the seat, came with a warning in the owners' manual not to go too fast around turns, and has far less hidden cargo space than the trunk of the car did. If you have not bought a good used vehicle lately they are PRICEY. The insurance company gave me 7,300 for the wrecked car. Dumb me - was expecting 3,500.

> On Jun 17, 2021, at 11:02 PM, deanvp <deanvp at att.net> wrote:
> 
> 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
> 
> 
> 
> Sent from my Galaxy
> 
> 
> -------- Original message --------
> From: Brad Loomis <brad.loomis at gmail.com>
> Date: 6/17/21 5:49 PM (GMT-08:00)
> To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
> Subject: Re: [AT] Airflow calculations of perforated metal for radiator screens
> 
> 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 <mailto: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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