barneybrendan Posted January 6, 2011 Share Posted January 6, 2011 Is there any reason why everybody fits puller fans when fitting twin electric fans.Would it make any difference fitting pushers between the rad and fmic.There is a fair bit of room between them with the aircon removed. Quote Link to comment Share on other sites More sharing options...
hodge Posted January 6, 2011 Share Posted January 6, 2011 Very interesting. Awaiting some constructive replies. Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 6, 2011 Share Posted January 6, 2011 I got no room between the FMIC & rad Quote Link to comment Share on other sites More sharing options...
hodge Posted January 6, 2011 Share Posted January 6, 2011 I've got a canny bit of room Jay if I move the coolers. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 mine has the aircon rad removed.Ive searched loads and cant find anything with this question mentioned.just be another way of getting things out the way Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 6, 2011 Share Posted January 6, 2011 mine has the aircon rad removed.Ive searched loads and cant find anything with this question mentioned. Mine has too, I put an oil cooler inbewteen the FMIC & Rad & now there is no room for any fans. Quote Link to comment Share on other sites More sharing options...
hodge Posted January 6, 2011 Share Posted January 6, 2011 mine has the aircon rad removed.Ive searched loads and cant find anything with this question mentioned.just be another way of getting things out the way I'm a big fan of getting things out the way but my twin fan setup cost a fortune and I wouldn't want to mess with the cooling on a 2JZ engine if it wasn't proved to out perform the normal setup. Quote Link to comment Share on other sites More sharing options...
JamieP Posted January 6, 2011 Share Posted January 6, 2011 Cant see there being room on mine, 5" ic, aircon rad and PAS cooler. I have SRD fans and they have been brilliant. Electric fans are great imo, i know people say there is no benefit as electric ones still draw power, but mine hardly ever come on, you get enough air flow when moving to keep it cool, they only come on in traffic. Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 6, 2011 Share Posted January 6, 2011 Most of the twin kits are pullers too, so any pusher setup would need to be custom made My car used to run hot in the summer, since I ducted the FMIC & sealed the fan shround against the rad I've had no probs Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 most of the descent electric fans come in either pullers or pushers.Can anybody see a reason why you couldnt fit pushers.I have some pushers that flow a lot of air,whereas the cheap twin kit i bought are pullers and too be honest are crap flow. Quote Link to comment Share on other sites More sharing options...
hodge Posted January 6, 2011 Share Posted January 6, 2011 most of the descent electric fans come in either pullers or pushers.Can anybody see a reason why you couldnt fit pushers.I have some pushers that flow a lot of air,whereas the cheap twin kit i bought are pullers and too be honest are crap flow. Well I love innovation. Give it a go mate, what's the worst that can happen. Make sure you've got a good aftermaket water temp gauge and you can't go wrong really. Quote Link to comment Share on other sites More sharing options...
SimonB Posted January 6, 2011 Share Posted January 6, 2011 I'm pretty sure pull fans are more efficient, but I can't find the link I came across saying why now! Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 6, 2011 Share Posted January 6, 2011 Well I love innovation. Give it a go mate, what's the worst that can happen. Make sure you've got a good aftermaket water temp gauge and you can't go wrong really. Good pushers have to be better than crap pullers Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 I think i will unless somebody comes up with a good reason why not. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 I'm pretty sure pull fans are more efficient, but I can't find the link I came across saying why now! Why would they be more efficient if they flow the same amount of air. Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 6, 2011 Share Posted January 6, 2011 Why would they be more efficient if they flow the same amount of air. It won't be to do with what the fan is rated at, prolly to do with fluid dynamics of how a fan operates as it pushes or pulls through a restriction Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 This is the sort of thing i was wondering ,thats why it would be nice for somebody in the know to post up a detailed explanation. Quote Link to comment Share on other sites More sharing options...
hodge Posted January 6, 2011 Share Posted January 6, 2011 If you have a set just fit them n have a go. If the temp rises stop, wait til it cools down take the car home n take them off. "You'll never know unless you give it a go". Lol. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 I have to get my car running first anyway.might get the pushers in there and wires ready to swap over from the pullers and leave them there aswell.That way it can be swapped over easily enough when its mapped. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 just found out pusher fans are 80% as efficient as puller fans.so if the flow rate is higher than what is required on the pusher it should work out the same or is my thinking away with the clouds.What does a 6 cylinder engine require in flow rate ,in the write up ive just seen it says 2,000cfm.If thats about right then 2 pushers flowing 1,600 each should do fine. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted January 6, 2011 Share Posted January 6, 2011 Maybe they're more efficient at cooling because pulling the air flow through is smoother and less turbulent than pushing it? Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted January 6, 2011 Author Share Posted January 6, 2011 Maybe they're more efficient at cooling because pulling the air flow through is smoother and less turbulent than pushing it? apparently its because pullers are pulling hot air out of the rad whereas pushers are just pushing cold air in. Quote Link to comment Share on other sites More sharing options...
Ark Posted January 7, 2011 Share Posted January 7, 2011 Surely an time you're driving over about 30mph you'll be shoving more air through there than any fan can shift anyway... At that point, the fan housing becomes an obstruction to the airflow. Quote Link to comment Share on other sites More sharing options...
jagman Posted January 7, 2011 Share Posted January 7, 2011 Surely an time you're driving over about 30mph you'll be shoving more air through there than any fan can shift anyway... At that point, the fan housing becomes an obstruction to the airflow. This ^^^^^^^ Years ago radiators were huge and sumps were huge ( water and oil temps are linked) This presented a problem the frontal area was also huge and an aerodynamic disaster Constant temperatures are required, but at high rpms and high power there are more combustion explosions per second and bigger heat generated and vice versa at idle so you can overcool at idle or undercool at max the result was to use a smaller, thinner radiator and duct air to it ,great at speed ,but the overcooling at idle was still a problem ,the fan was engine driven So someone thought of using an electric fan , no cooling air at all unless it was needed and switch it on with a temperature switch ,,, so you have both a waterstat and a fanstat to regulate The rad is sized and the waterpump rated flow is done to undercool at low rpms and low car speed and the elect fan used to control the temp this also allows faster engine warm up to constant temp So as long as the fan moves enough air to cut out its stat after a few mins fine , but it must also not impede the normal airflow during driving , no electric fan can cool the higher power levels heat generated Quote Link to comment Share on other sites More sharing options...
2soops Posted January 8, 2011 Share Posted January 8, 2011 On my MkIII with the small block chevy, push fans in front of the rad never cooled enough, when i changed to the same cfm pull fans on the engine side all was fine. I think it was down to the pull fans blowing air out of the engine bay as much as pulling air through the rad. When they were running you could feel the warm air blowing out from underneath lowering engine bay temperature as well as cooling the rad. The push type fans would also be in the airflow prior to the rad and would presumably obstruct airflow. Dont rely on this as im no expert, but this is what i found from past experience Quote Link to comment Share on other sites More sharing options...
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