Creaver 55 Report post Posted March 5, 2011 Hey guys, I've been googling for a while and havn't come up with a decent answer. I am looking into removing my mechanical fan and replacing with an electric one. However, i'm unsure if I should go for one larger fan or two smaller sized ones, what is your opinion on this? Cheers, Ian Quote Share this post Link to post Share on other sites
Jacko 2158 Report post Posted March 5, 2011 Work it out in terms of area, Find the biggest single fan you can fit, and the biggest twin fans you can fit and compare the areas ( Pi x r(^2) ) Go for max coverage of your radiator and you cant really go wrong. Single fan usually comes out on top. Stuff like blade design and rpm will effect the amount of air moved, but its still apples to apples if your using decent fans. The easiest way to wire em up, depending on amp draw, is a Davis Craig thermoswitch doofa. The switch is rated for 20A, so you can run most fans without a relay and its adjustable from like 40C-100C. Quote Share this post Link to post Share on other sites
BM WORLD 1285 Report post Posted March 5, 2011 rewire the ac fan and use a lower temp sensor on the radiator from a e36 318ti so the fan cuts in earlier . can shwo you how if you like Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted March 6, 2011 One large one I reckon - the bigger fans move more CFM (if you look at specs), probably because one 14" fan has roughly the same total coverage area as two 10" fans but less unutilised area due to the motor. Quote Share this post Link to post Share on other sites
Creaver 55 Report post Posted March 6, 2011 Cheers. I ended up purchasing a 14" fan as this was the largest I could fit. And decided it was cheaper and I don't think another fan would've made that much of a difference (proven right by your comments it seems). Ian Quote Share this post Link to post Share on other sites
