I always used distilled water as it’s supposed to be easier on electronic components in the event of a leak – it doesn’t contain all the minerals of tap water. I took several measurements from the heater core as well as the 120mm fan. I'm surprised that your existing fan shroud isn't enough to keep your slow speed cooling chores up to snuff. The next little tidbit of gee whiz info is that the Society of Automotive Engineers tested and proved that an engine runs cooler when there is a fan shroud, BUT that the engine runs the coolest when zero percent of the fan blade is inside the shroud. Secrets to the fan shroud. ... One issue that happens is a broken wire, a common thing that happens since there is a lot of movement that can easily bend the wire. Following are the results: As you can see, adding a fan shroud increases the cooling ability of the Radiator by a 40.9%. And for good reason; even electric-fan manufacturers will begrudgingly tell you that all things being equal a belt-driven fan with a shroud around … Today we might want to call them non-PWM fans. We have more than 30 fans and settings that we will be looking at today. The cutout is sized to be about 1 inch narrower (20") as shown in the drawing so the strip is mounted about 0.5" past the edge of the cutout. Drill a hole in the rad core template that corresponds to the location of the fan's center. I have no idea if this is the case or not, and hope I never have to find out, but at 89 cents a gallon from the local grocery store, it’s cheap insurance. Another issue is that it may be plugged into the wrong jack on the motherboard. I used size 8 screws with lock nuts. I dont know what the earlier gen shouds look like, but ive never had to take the radiator out to take the shoud out on my 77, but thats because the previous owner cut a few notches in a few well planned out places, it takes about 10 mins or so of maneuvering and its in/out. I also put Erythromycin in my water. I had been running a BECOOLING copper water block and the small 5×5 BECOOLING radiator for quite some time. Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. A shroud makes these much more effective but most of the shrouds have moved the fan back from the core too far. Imagine that! I know on my '75, I had to remove the radiator. Step three: remove shroud. I found several fan shroud designs on the net, but most required a specific heater core be purchased with the shroud. One is never enough. To hold the fan shroud together, I used some double sided foam tape in the corners where the two pieces of metal came together. I decided the best compromise for maximum air flow that would leave some room in the computer chassis would be a 1.5″ distance between the heater core and the fan. For a better experience, please enable JavaScript in your browser before proceeding. With a mallet, Alexander started the initial 90-degree bend to the bottom of the shroud. I decided with a little time I could design my own fan shroud to custom fit the Chevy Chevette Heater core. The spacers arn't expensive. Usually ships within 1 to 2 months. 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Objects in the mirror have received punishment. :lookinup: Step one: remove fan. Most of these cars didn't use a shroud at all when new. To hold the fan shroud together, I used some double sided foam tape in the corners where the two pieces of metal came together. I purchase the Erythromycin from a local aquarium shop for $0.69 cents a tablet. If you have the length of the sides correct, when all sides are bent they’ll touch together at just the right points. We manufacture every part we sell and ensure every item meets our strict quality control standards. I recommend covering the backside of the radiator with a piece of cardboard to avoid bending the fins before removing the fan … Except that some of you insist on using fan controllers to vary the speeds of your fans. Bending the sides together in this fashion made the shroud very strong, and using the double sided tape provided an air tight seal at the bends. The shroud was removed and it was determined that the shroud was made out of polypropylene. There are 4 angles to make at each corner. I had the radiator out and tried everything, never got it out either. This will cause leaks. If you’re unsure of the specific melting points of the solder, check with a local heating and air shop and they’ll get you what you need for cheap. The geometry would be used to determine the angle at which the bends would have to be made in the shroud to give me the proper distance between the fan and the heater core. Then I had to rummage around in the old brain and remember some of that geometry I thought I’d never need. In my research, I came across some new radiators that had hit the market since my original BECOOLING purchase, such as the Black Ice Xtreme. At about the midway point you can pull the fan out before lifting the shroud the rest of the way. The shroud should only extend rearward up to the front edge of the fan blade. I thought about using 3/8″ silicone tubing stretched over the barbs, but later decided to cut the barbs on the heater core off and sweat on a pair of 3/8″ barbs so that I could use vinyl tubing, which I prefer. For ideal cooling performance the fan blade needs to sit 1/3 to 1/2 way inside the shroud. Make sure it sits high all the time. This was fairly easy but care had to be taken not to over cut into the angles. The first is simply a 45 degree angle cutting through the corner. Your email address will not be published. Horsepower is like potato chips. They focus airflow through the entire radiator as compared to just the area that is covered by the traditional fan, creating a vacuum that pulls air across the entire surface area of the radiator, thus increasing cooling. Check here for special coupons and promotions. Don’t laugh – they were cheap, readily available, and I had a lifetime supply at my desk. This allows room to pull the shroud straight up along with the fan. It is not created or sold by the OE car company) 4.7 out of 5 stars 9. Need tips on tuning your carburetor, converting your vehicle to propane fuel, or just need help installing your cold air kit? Doing more research and perusing the Overclockers.com Forums, I found that a 1986 Chevy Chevette Heater Core was basically the same design – only a tad larger and MUCH cheaper. As use in this review, a case fan is a fixed-voltage fan. I used a Dremel tool to cut the heatercore’s barbs off and a small propane torch to sweat the 3/8″ barbs on. There is also a quarter sized hole that i need to fill in. Then remove the fan shroud being careful not to scrape the radiator as you lift it out. These mounting holes corresponded to the mounting holes in the 120mm fan and I used the fan as a template to know where to punch the holes. These fans are “set ‘em and forget ‘em” fans. Once bent into shape, I turned it upside down and used a nail to punch the four mounting holes in the shroud. Best of all, it would be VERY inexpensive. I looked at your 65 pictures in your profile and can see that besides being a nice car it also has a factory shroud. If you find a way, let me know. Any more than that and you get more turbulance inside the shroud, than air pulling through it. How To Design & Build A Fan Shroud Browse Two Minute Tech Categories. with the engine in the car, I have to take all the bolts out of the core support and either remove it or roll it forward at the top.. Is not fun at any rate. ... that sits on top of the rad (from the exp tank) does not need to come off. A video about how to fabricate a custom Aluminum fan shroud for the dual 11 inch SPAL fans for use in a C3 Corvette. You might put one on to space the fan correctly without the shroud to test if a shroud in even needed. Reply. The only "problem" that needed correcting in my case was that the plastic fan shroud had a slight bend which I could not straighten. Finally I took a 4″ hole saw and cut a hold in the center of the sheet metal. The fan shroud was damaged when the fan made contact with the shroud. There were two kinds of sheeting, both the same size. Assembly the three pieces together: Bolt the three pieces together using the long bolt - this aligns the three pieces If you have 300, you want 500. It's a Biatch to get out.. This core would fit a 120mm fan nearly perfectly and will work well with my plans of adding a fan shroud. The 1.5" strip doesn't need to go all the way to the bottom half of the shroud. I filled the system with Distilled Water. Spending less than $10.00 on the shroud and gaining 40.9% in cooling ability with just a little work was a worthwhile endeavor, not to mention fun. ... and insert the small end of the tool into the hole from the back and cradle the bend in the notch. Save my name, email, and website in this browser for the next time I comment. I say “more than twenty’’ because I can’t count. Every Rhino Fabrication custom bucket seat shield, console box liner, dash pad, fan shroud, and kick panel is manufactured in the Bend, Oregon USA and made with precision and quality by unrivaled craftsmen you will not find anywhere else. I fixed it by removing the shroud and using a small die grinder, I made the holes in the shroud a little more elongated giving a 1/4 inch more up and down adjustment on the shroud. It has a mechanical fan, and without a shroud, the fan doesn't really pull much air at all through the densely packed fins of that chopped radiator. Using geometry, I determined that the fan shroud’s sides would need to be 1.625″ long and bent at an angle of 67 degrees in relation to the fan. Very detailed instructions – a great How-To – Darcy Viohl FREE Shipping by Amazon. I used some #8×32 5.5″ bolts to mount the fan/shroud/radiator assembly to the case. To seal around where the fan would mount to the shroud and where the shroud would mount to the heater core, I used some 3/8″ weather stripping – also purchased from Home Depot for about $3.00. With this all complete, I started putting the system together in my case. The solder they use putting these heater cores together melts at a relatively low temperature. The heater core measures right at 6.25″ wide by 7.25″ tall. Got a question for people who took apart the fan shroud in order to do vanos and valve cover gasket. If you have 500, you want 800. I am trying to remove the fan shroud on my 71. The full product line now includes the patented Flex-a-fit aluminum radiators, electric fans, belt-driven fans, oil coolers, Mojave heaters and Flexite windows. I applied this weather stripping to the edges of the fan where it would mate with the fan and heater core. Chris . Good Luck!!! I do not have access to my car now :down: (at tranny shop) i can take pics in about a week if anyone wants, sorry for the wait. They make a fan spacer in different lengths that you put between the fan and pully. Drill a hole through the center of the block of wood corresponding to the fan shroud depth. Order Cooling Fan Shroud for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. With the angles all mapped out, I used a pair of tin snips to begin cutting. Gently bend the strip in the curved shape of the fan; about 21" diameter. im thinking abotu changing my shroud,keeps overheating and there are no problems,only in traffic so its a airflow problem.currently it has just a 'guard' type of shroud over the fan thats open on the bottom to work on the car, if you hold a paper in front of … I am NOT a fan of using bailing wire and duct tape just to make something functional. Electric fans have advantages, but so do engine-driven fans. If you are interested in counting actual fans, be my guest. With the temp stabilized, I began running Prime 95 in torture test mode. Just offering a solution that may work in this situation. This got into more money than I felt these parts were worth, as well as limiting what heater core I could use. 86. The one time I didn’t use this, I had to change out the tubing and clean the pump and reservoir after about 90 days due to all the funk that had grown in the system. Using the edge of my work bench as well as a vice for the tighter bends, I bent the shroud into shape. This heater core has one ½ inch barb and one 3/8 inch barb. Automotive $45.86 $ 45. I can't do it on my '77 with the radiator in and even with it out I have to bend the plastic at the bottom to get it around the engine pulleys and the frame. A forum community dedicated to Corvette C Series owners and enthusiasts. With that part of the project complete, I began looking for a fan shroud. With that piece cut out, I used a protractor to mark the angles where bends would occur and I drew a grid on the sheet metal to keep my bends straight. A buddy of mine that works in heating and air helped me with mine and had a stick of what I needed in his work van. Drill the holes through the tabs of the strip to the shroud plate and mount screws. The fan shroud will need to be heavy enough material to not flex or deform when exposed to the wind and pressure put on it by driving and the fan rotation. I began by making several templates using Post It Notes. Re-install your fan shroud using the radiator relocation brackets supplied with this kit to effectively lower it by 1". Step 2 We used a hot air welder to apply polypropylene strips to span and cover the hole. Sweating the new barbs on is fairly straight forward. I decided to try one out and picked one up from Auto Zone for $16.99. It is a two piece shroud, and I would like to fill in the seam with something. The only thing you have to watch is the solder around the edges of the heater core. Weigh out which cooling fan type is best for you. Just be sure to clean the mating surfaces with a wire brush or sandpaper before sweating. For a $16.99 upgrade and about 20 minutes worth of work, it was well worth it. corner, and at the bottom in the middle-ish about 3x4 inch U to clear the water pump. And we proudly make our products in the U.S. If I were to do it over again, I would try going without one. Make sure the solder you use on the replacement barbs also has a low melting point or you’ll end up heating the core up enough to melt the solder in the joints before your new solder melts. This became more evident as summer came into full swing. Posted: Thu Nov 05, 2020 10:00 am Post subject: Re: 9N fan shroud: I don't remember where I got the one I put on my 2N. You may think that a shroud is a useless piece of plastic or metal, but they really do serve a purpose. Air & Fuel. I bought the piece with the lip on it and just cut it off at home. Once I had the final design made out of a Post It Note, I began making an actual full size prototype out of paper. Save Share. When you upgrade to a proper fan shroud or duct, your fans get a better angle for airflow. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I had to stiffen it in order to acheive the necessary clearance. Happy with the prototype, I made a trip to the trusty Home Depot where I picked up a 2′ x 3′ piece of sheet metal. my question is... do I have to remove the coolant hose ? I ran the same test before the fan shroud was added to the system to see just how much difference the shroud would make. This gave me the total size the sheet metal should be cut to which is an 8″ square. Read More, Case fans are supposed to cool your case. The only difference was one had a ½” lip on it so two pieces could be joined and the other piece was completely flat. I can't do it on my '77 with the radiator in and even with it out I have to bend the plastic at the bottom to get it around the engine pulleys and the frame. I break open the tablet and pour the entire tablet into the water, discarding the plastic shell. Today 70% of project vehicles. Well, in any case (in any case – get it?) we’re going to look at more than twenty case fans. Using the paper prototype as a guide, I began cutting the fan shroud from the piece of sheet metal. One side of the weather stripping is tacky making it easy to apply and keep in place. The piece that was completely flat was $2.00 more. id love to take pics for people if interested, the only notches are in the (right?) With the system filled and protected from bacteria and other nasties, I fired it up and let it run for about 24 hours to stabilize temperatures. I started looking into ways at increasing the efficiency of the water cooling unit I had designed. This looked like a nice heater core design but was quite pricey at nearly $80.00. This keeps any creepy crawlies from setting up camp in my water cooled system, clogging my pump and hoses. Where the fan sits in relationship to a shroud is as important as the fans distance to the radiator without a shroud. I easily pushed the bolts through the heater core, which bent the fins out of the way and allowed the bolts to pass through. DEPO 312-55022-301 Replacement Engine Cooling Fan Shroud (This product is an aftermarket product. Read More. These slim fans fit in tight areas. Amazing how much difference a shroud makes – James Orrand. After going through several iterations, I finally had one that appeared to be strong as well as easy to make. Following with a body hammer, the graceful curve to the bottom of … Performance cooling products for the automotive market. I think a shroud should make a big difference. The cost for this piece of 2′ x 3′ sheet metal was about $3.50. Any less than that and you start pulling air from all over the place. After the core cooled down, I hooked some tubing up to it and put it under water to do the bubble test. Large washers were used to secure the assembly to the computer case. Corvette Forum : DigitalCorvettes.com Corvette Forums. As I'm replacing the water pump in My Monte Carlo, I think now would be a good time to work on my fan shroud. The other three are ½ of the 45 at 22.5 degrees each. The radiator upgrade made a small difference in my max load temps, lowering them by about 4 degrees Celsius. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! JavaScript is disabled. from auxilary pump ? This may require you to choose a low-profile fan option. SKYLINE R34 GTT RB25 air conditioning condenser fan shroud 92123-5L703 + motor AU $249.00 Fan Shroud For Toyota Landcruiser 80 Series 4.2L Inline 6 1HZ/1HDT (1992-1998) The angle isn’t that big of a deal. This was adequate for my Duron 650 running at 1000 MHz that the water cooling system was originally designed for, but it was being taxed by the current 1.4 GHz T-bird running at 1.6 GHz and 2.01 Volts. See the last two Images on the right to get a better understanding of how this is done. I took the size of the fan at 120mm, which is about 4.75″ and added 3.25 inches (1.625×2 for each side). But I do remember doing some cutting and bending to get it to fit and clear the fan blades. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. That SHOULD be more than adequate. The factory shroud didn't have any lip past that and the reason is because the radiator mount and fan are tilted such that the blades are already partially in the flat part of the shroud at the bottom half. Whatever your choice, the right fan and shroud will do the job! Check out these great tips in the Air & Fuel Category. The bends in the corners would allow the shroud to attach to itself, making it stronger and easier to assemble. I still had clearance problems with the fan. Step two: remove radiator. Jump to Latest Follow 1 - 9 of 9 Posts. This is very important to do if you do not want to trash your fan. To see the original specs of the water cooling system check out my previous article Detailed Water Cooling (and other tricks). Bending the sides together in this fashion made the shroud very strong, and using the double sided tape provided an air tight seal at the bends. First remove the fan shroud ring and leave it in place over the fan. I had the same problem on my car and tried to bend the shroud also. Fan manufacturers have continued to reduce the thickness of the fans and now there is a shroud from Cool Craft that when combined with the fan only measures 2-5/8-inches thick. No bubbles, no leaks. 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