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displaying posts 1 to 19 of 19
| Author | Subject: 1 or 2 fans..? |
 devere
Senior User  Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #1
So as I'm having a tidy up and re do of my front end im debating what to put on my new radiator.On my direnza short rad I've had two 10 inch fans on the back of the rad. They take up the whole of the rad. My new rad is considerably bigger. So is it worth keeping the 2 smaller fans from the old rad, or would 1 larger fan on its own be as good/better? I'm thinking about 12 or 13 inch. Would it help to have one half of the rad free flowing with no fan behind it? |
 Posted 30th Apr 2018 at 18:49
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eddy_gti6
Seasoned Pro  Location: Durham Registered: 20 Oct 2008 Posts: 8,716 Status: Offline |
Post #2
I run 1 12 inch fan on a standard rad. Never had any issues on the road or track.________________________________________ Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url & = |
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Posted 30th Apr 2018 at 19:36
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barrym
Senior User  Location: Westcliff-on-sea Registered: 26 Jun 2014 Posts: 502 Status: Offline |
Post #3
1 fan is enough for me.________________________________________ China D Turbo HDi daily chargerBlack Rallye occassional toy |
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Posted 30th Apr 2018 at 19:58
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RetroPug
Seasoned Pro  Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #4
As an alternative, you could have one fairly large fan which runs on the std. wiring, plus a little one running off of a relay & manual switch.________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 30th Apr 2018 at 20:20
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prism7guy
Seasoned Pro  Location: DoncastAAAAARGH Registered: 13 Jan 2008 Posts: 4,640 Status: Offline |
Post #5
Do you know what brand the fans are?Mine are from carbuildersolutions, pretty sure they're the 10" ones so that would be 650cfm each. Their 14" fan is 1500cfm so should in theory move more air through the radiator and therefore get rid of more heat quicker. 10" fan clicky 14" fan clicky Mine are more than capable of managing the coolant temperature when the car is stationary, but had issues with overheating with ambient air 30+c when making the car work hard, but i'm pretty sure the fans do very little once the car is above a certain speed anyway and my issue is i need a bigger radiator. ________________________________________ Goldie the track car. |
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Posted 30th Apr 2018 at 20:31
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blandy
Seasoned Pro  Location: Bucks Registered: 25 Feb 2007 Posts: 2,437 Status: Offline |
Post #6
One fan is ample - best thing I ever did cooling wise was to make a fibreglass surround for the rad. On my 205 this alone dropped temps by 10deg. I’ve done same on my 306 with 205 rad and sits at 85ish even after 25-30mins round track |
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Posted 30th Apr 2018 at 20:40
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #7
quote: [quote="blandy"]One fan is ample - best thing I ever did cooling wise was to make a fibreglass surround for the rad. On my 205 this alone dropped temps by 10deg. I’ve done same on my 306 with 205 rad and sits at 85ish even after 25-30mins round track You mean the fibreglass shroud/scoop on the front to make sure the air doesn't go around the rad? I intend to make similar. Although not sure what my fibreglass moulding skills are like! 😂 |
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Posted 30th Apr 2018 at 20:50
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #8
My engine bay is very enclosed. Sump guard underneath along with side guards from inner arch to sump guard. Not much way of heat escaping.My problem has mainly been on the hot days like mentioned above. I'm going to a couple of bonnet vents to get some heat out too. Give it somewhere to actually go. I can probably only go 12 inch fan. Maybe 13 at a squeeze.. I have a feeling the 10s mat be CBS fans. Might look at a spal fan with a high volume of air moved? |
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Posted 30th Apr 2018 at 20:56
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blandy
Seasoned Pro Location: Bucks Registered: 25 Feb 2007 Posts: 2,437 Status: Offline |
Post #9
quote: [quote="devere"] quote: [quote="blandy"]One fan is ample - best thing I ever did cooling wise was to make a fibreglass surround for the rad. On my 205 this alone dropped temps by 10deg. I’ve done same on my 306 with 205 rad and sits at 85ish even after 25-30mins round track You mean the fibreglass shroud/scoop on the front to make sure the air doesn't go around the rad? I intend to make similar. Although not sure what my fibreglass moulding skills are like! 😂 Yeah exactly that first time I’ve done fibreglass so not the prettiest but does the job well enough just made a template out of plastic and then fibreglassed over the top blandy has attached the following image: |
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Posted 30th Apr 2018 at 20:57
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #10
quote: [quote="blandy"] Yeah exactly that first time I’ve done fibreglass so not the prettiest but does the job well enough just made a template out of plastic and then fibreglassed over the top Looks like I will have to get to work and make similar. That was just to fit behind an unmodified standard bumper? Il have to get the new bumper on and try and make a template from something.. You instantly noticed the difference it made then? |
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Posted 30th Apr 2018 at 21:07
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blandy
Seasoned Pro Location: Bucks Registered: 25 Feb 2007 Posts: 2,437 Status: Offline |
Post #11
I did on the 205 previously but as it made such a difference I made one for this strait away before driving it, fits behind standard bumper as didn’t fancy cutting away the crash bar. Also keeps Hot air from the bodies as well |
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Posted 30th Apr 2018 at 21:11
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Day666
Seasoned Pro  Location: Bristol Registered: 20 Apr 2013 Posts: 5,214 Status: Offline |
Post #12
I only run one 11inch fan now but also made a radiator cowling to direct / scoop as much air as possible....my Engines always ran cool even on hot days ...Martin another neat thing to do which Sandy does and Mei / Welshpug mentioned a few times is to drill a few tiny holes around the very outside of the thermostat itself ...just inside of the rubber seal .....that allows water to pass and flow /not pressure to much when semi / or closed ....and even helps a little when open so say ???? He does that on all his race engines  |
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Posted 1st May 2018 at 07:43
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cully
Seasoned Pro  Location: Cullompton Registered: 12 Jun 2013 Posts: 1,093 Status: Offline |
Post #13
quote: [quote="Day666"]... Martin another neat thing to do which Sandy does and Mei / Welshpug mentioned a few times is to drill a few tiny holes around the very outside of the thermostat itself ...just inside of the rubber seal .....that allows water to pass and flow /not pressure to much when semi / or closed ....and even helps a little when open so say ???? He does that on all his race engines I believe that is mainly done to aid bleeding the system, stops buildup of air against the stat plate ive done this and it works really well |
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Posted 1st May 2018 at 08:01
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #14
I did drill a hole in the thermostat a while back. Is one enough or is a few better?Always managed to get the system held and working fine as it is tho. |
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Posted 1st May 2018 at 13:35
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Day666
Seasoned Pro Location: Bristol Registered: 20 Apr 2013 Posts: 5,214 Status: Offline |
Post #15
quote: [quote="devere"]I did drill a hole in the thermostat a while back. Is one enough or is a few better? Always managed to get the system held and working fine as it is tho. About 3 is enough |
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Posted 2nd May 2018 at 19:38
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Day666
Seasoned Pro Location: Bristol Registered: 20 Apr 2013 Posts: 5,214 Status: Offline |
Post #16
quote: [quote="cully"] quote: [quote="Day666"]... Martin another neat thing to do which Sandy does and Mei / Welshpug mentioned a few times is to drill a few tiny holes around the very outside of the thermostat itself ...just inside of the rubber seal .....that allows water to pass and flow /not pressure to much when semi / or closed ....and even helps a little when open so say ???? He does that on all his race engines I believe that is mainly done to aid bleeding the system, stops buildup of air against the stat plate ive done this and it works really well Your correct Paul but also helps other issues to ... |
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Posted 2nd May 2018 at 19:39
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jimbok_b16
Newbie  Location: Norwich Registered: 30 May 2016 Posts: 48 Status: Offline |
Post #17
i fitted a fan on each side of the rad and just staggered them. ones on a manual switch so I can cool the engine after a few laps |
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Posted 25th May 2018 at 17:29
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #18
quote: [quote="jimbok_b16"]i fitted a fan on each side of the rad and just staggered them. ones on a manual switch so I can cool the engine after a few laps I did that originally a while back. I found that the fan on the front blocked the air flow cooling the rad somewhat, so moved them both to the back. I believe a pulling fan is more efficient also? I have ended up going to my original 2 fans on the back of the new rad now. And going down the fibreglass front scoop to direct air through the rad. |
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Posted 25th May 2018 at 18:23
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orta
Senior User  Location: East Mids Registered: 02 Sep 2006 Posts: 860 Status: Offline |
Post #19
I was having this exact conundrum after my euro trip where we were driving hard in the hotter climates of southern France. Obviously the Rallye only has 1 fan, whilst the lads in the GTIs has two. I was recommended 1 12” Spal fan combined with the Nissens Rad I already have. ________________________________________ CLUB BLACK RALLYE||B8s||60-70mm drop||Black Partner Steels||P1 VTS Rack||Refurbed Beam||Hybrid ARB||VTS Torsion Bar|| |
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Posted 3rd Jun 2018 at 09:37
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