tad70 Posted October 5, 2022 Report Share Posted October 5, 2022 (edited) I installed a volvo dual speed fan today along with the relays and BMW temp sensor. had no room to install on the inside so i installed it as a puller. its super loud. Had my truck idling for about 25 min. and both speeds kicked in. .. just need to clean it up. with the fan running high my battery was at 13.94. the bracket around the fan i took from a volvo as well. url=https://postimages.org/][/url] Edited October 5, 2022 by tad70 update 2 Quote Link to comment
datzenmike Posted October 5, 2022 Report Share Posted October 5, 2022 Looks like on the outside of the radiator so wouldn't that push air through it. Hopefully we are meaning the same thing but we have had electric fans blowing air forward into the direction of travel before. You have it fused and 'on' all the time? Mine will sometimes come on after I get out and start walking away and this reduces any heat spike and makes restarts easier. 1 Quote Link to comment
tad70 Posted October 5, 2022 Author Report Share Posted October 5, 2022 yes, its on a fuse. yeah mine works the same way 1 Quote Link to comment
EDM620 Posted November 7, 2022 Report Share Posted November 7, 2022 Factory electric fans are engineered as pullers and are mounted behind the rad. The shrouding around the fan helps control air flow. The fan blades then are shaped or "scalloped" to maximize pulling efficiency while reducing noise, so simply reversing the fan motor direction won't create the same amount of CFM. The "reversible" aftermarket electric fans are far more basic shape to the fan blades, the trade-off to run in either direction. Here's how I did my puller-to-pusher conversion: 1st step was to confirm operation and noise of my salvage yard fan. I bought a few candidates to choose from. Had a winner so time to make it blow! Note the rotation direction of the blades. The fan was disassembled and then I very carefully cut the hub off from the ring the blades projected from. You want to be sure that cut is parallel all the way around. A few test fits and I was able to use the moulding ribs to help "lock" the inner hub to the outer ring. I made up a support to help keep the parts parallel and aligned while the epoxy set. Overall balance is important too. I balanced the modified blade assembly and confirmed there was no run-out or wobble as it turned. Next test was to spin it by the motor and again check for wobble or run-out, and that the assembly wouldn't grenade. Final reassembly. Note the arrow on the fan blade showing the rotational direction the fan needs to turn is retained. Since a pusher fan by default blocks some of the air flow into the rad, I chose to keep as much of the cooling fins unobstructed as possible. I can add shrouding later if needed. 1 Quote Link to comment
datzenmike Posted November 7, 2022 Report Share Posted November 7, 2022 This was inside the radiator, puling air through the radiator??? If it was turning the direction of the arrow it would be pushing air into the radiator not pulling it through. 1 Quote Link to comment
Charlie69 Posted November 7, 2022 Report Share Posted November 7, 2022 Tad70 be sure the fan to frame mounts have rubber isolators as the frame and body of the truck move independently. https://www.mcmaster.com/rubber-isolators/ These will help to not break you shroud on your fan. Quote Link to comment
Stoffregen Motorsports Posted November 7, 2022 Report Share Posted November 7, 2022 Here's another tip - when installing an aluminum radiator, make sure it's grounded to the body or electrolysis will kill it. If it's mounted in rubber isolators, run a ground wire from the aluminum core to the body. 1 Quote Link to comment
jagman Posted November 7, 2022 Report Share Posted November 7, 2022 iNTERESTING, When we built our race cars and had an aluminum radiator fitted we completely isolated the radiator with non-conductive washers and sheathed the bolts holding it in place to prevent any electrolysis. It seemed to occur only if the aluminum was in contact with steel. The aluminum degrades as the sacrificial metal. Quote Link to comment
Stoffregen Motorsports Posted November 7, 2022 Report Share Posted November 7, 2022 I just looked into the two opposing theories and about two thirds of the results lean towards grounding the radiator, which led to one question. I found the same question on the Bob's the oil guy website. I'll paste it below. Quote Link to comment
datzenmike Posted November 7, 2022 Report Share Posted November 7, 2022 Water isn't a good conductor but anti freeze might be. 2 Quote Link to comment
EDM620 Posted November 10, 2022 Report Share Posted November 10, 2022 On 11/6/2022 at 11:07 PM, datzenmike said: If it was turning the direction of the arrow it would be pushing air into the radiator not pulling it If you look again, the direction of the arrow would be pulling air... from the engine side of the radiator 1 Quote Link to comment
datzenmike Posted November 10, 2022 Report Share Posted November 10, 2022 If this was on the engine side of the radiator and the fan turning as indicated, it would be pushing air into the rad. (beginning to think we may be looking at it differently and are both right. Carry on. . Quote Link to comment
thisismatt Posted November 11, 2022 Report Share Posted November 11, 2022 (edited) 8 hours ago, datzenmike said: If this was on the engine side of the radiator and the fan turning as indicated, it would be pushing air into the rad. (beginning to think we may be looking at it differently and are both right. Carry on. . In this pic the rad would be between the pic and your face, so the fan would be pulling air through the rad away from your face Edited November 11, 2022 by thisismatt Quote Link to comment
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