A while back I posted a fan shroud I made and a realized I had made few mistakes so here I am again....hopefully this one works as it should....this is sized for a Walker 4 row radiator on my Roadster, which has always had an elec fan but was not comfortable with the plastic gidjies that push thru the radiator fins. Just lookin' for a better way. I will post a pic. when installed and tested
why the outside small holes? won't that defeat the purpose of all air going through large fan opening
looked all over the internet and most all shrouds now come with vent holes in them in just about the same locations as these....not sure why but seems to be the practice now days
Not sure, but i think its a pressure relief thing..Years ago I bought a Walker plastic shroud w/ electric fan installed and it had a rubber flap at the bottom, about 3" x 2". With fan at high speed it opened a little, small flow.
Install some flexible rubber over the holes using only the top side. When at speed, the air will blow through the holes. At low speed, the fan won't be able to pull air from the holes due to the rubber blocking the holes. Rubber on the out side. ONE WAY VALVES !
I am looking into doing that...in fact there are some suppliers that sell these flaps with the correct "tension"......thanks
For the stock cars, we made them out of chimney flashing and they worked. In a crash, the shroud would crumple and not hurt anything else. Sometimes the radiator would survive. We had a pizza box template tacked to the garage wall so we could whip up a new one quickly.
Leave it as is. You did good. I built a shallow shroud for my 41 Plymouth and after having overheating issues, I removed it. Problem solved. There was no air being pulled through the corners and that was a lot of surface area. Deeper shrouds are more forgiving.
Yea...I'm gonna mount it as is and try it for a while before I make any more changes.....may even remove it as the car doesn't overheat at all without one, but I wanted to get the plastic "thru the core straps" off which is why I built this, so, I'll see what happens.
I agree, those plastic through the rad things always made me nervous. I removed mine and made a shroud as well. I had a single 16" pusher woth those and now have two 12" pullers with a shroud. I stole one of my wife's pampered chef silicone baking sheets for the flaps! Can't see the ugly bottom ones in the car. Only had one to steal....or else she'd notice.....
@Ron Brown Yes, I made it last spring. Cools better than the single pusher I was using. The pusher was a Derale 2 speed and has the same CFM as the 2 Spals I used in this shroud. But the pullers cool better. The pusher was always on high speed. The pullers stay on low to satisfy a cooling call most of the time. Flaps to actually suck closed when the fans come on. There is only 1/2" between the radiator and the aluminum plate. Very tight in there. The gap between the fans is for the water pump pully. I wired the 2 fans with 3 relays making them 2 speeds, series/parallel. Very quiet on the low (series) speed.
Does anyone know about how much room there is between the radiators side plates and the core… is there here room to get screws in without hitting the core?
Not a lot of space before you hit the radiator tubes. Measure and place a tubing spacer over your drill bit to limit how far your drill goes.
Got it mounted today and put about 50 miles on in 88 degree day. Never got over 185 deg. 100 deg days comin so I will know more then, but is working great right now.
Heard at a hockey game broadcast........ "He shoots! He scores!" A shroud comes into play at low speed, bumper to bumper traffic. If your fan is keeping up in those conditions, you don't need to further 'engineer" your shroud. It's a win! The holes, etc., make it look less like a cake pan so I guess that's a good thing. It looks great...... in the moonlight....... with one eye shut....... on horseback........ at 40 mph.
Never give up on kitchen supply houses. That shroud is really neat. Places like McMaster Carr can supply rubber trim for edging; you can fit it tight and super glue the ends. A little primer and semi gloss will hide them under a hood.
Yep, that's where I got my rubber edging for my shroud. And on the older style radiators with the steel supports on each side, I welded a strip of sheetmetal to each side support to both give a sealing surface and a place to attach the shroud. I just used some heavy spot welds, then sealed the sheetmetal to the radiator fully with some silicon. Worked slick!
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