Lotus Elan

Which cooling fan

PostPost by: s28ven » Sat May 04, 2019 5:17 pm

Hi, I have a s3 se with a big valve engine and I am looking for recommendations on which cooling fan to fit prior to the car going back on the road.

It has a large full width radiator and while being re-wired I would like to fit an electric cool fan.

Thanks,

Steven
s28ven
First Gear
First Gear
 
Posts: 15
Joined: 30 Sep 2014
Location: Glasgow

PostPost by: Foxie » Sat May 04, 2019 5:57 pm

https://www.demon-tweeks.com/eu/revotec ... ns-538118/

I fitted one of these a long time ago, with a top hose mounted thermostat Never a problem. The 255mm version is a nice fit in front of the radiator. :)
68 Elan +2, 70 Elan +2s
User avatar
Foxie
Fourth Gear
Fourth Gear
 
Posts: 829
Joined: 20 Sep 2003
Location: Wexford, Ireland

PostPost by: nmauduit » Sat May 04, 2019 6:52 pm

I have a Coolex equivalent on my big valve S4 (now endowed with Q420 cams) and it was initially set with one 9" push through Kenlowe ( I understand they don't sell to the public anymore, Revotec being the alternative) : push through is more efficient in my opinion, and leaves appreciable room when one wants to fiddle with the engine. I later fitted a second one after an intense track day in summer and having had to stop without cooling lap which resulted in some spill (I have since added a overflow tank), but in Scotland and on the road two fans should not be necessary.
S4SE 36/8198
User avatar
nmauduit
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1162
Joined: 02 Sep 2013
Location: France

PostPost by: Chris » Sat May 04, 2019 9:22 pm

Not being one to throw money away needlessly, or to be blinded by after market goodie claims, I calculated that my original Lotus pusher fan was more than adequate, all it required was more speed. So, a trip to the local scrapple and for two pounds I purchased a Toyota fan motor who which gave me 50% more revs. That was in 1991and it has performed faultlessly ever since.
Chris
Chris
Second Gear
Second Gear
 
Posts: 86
Joined: 06 Aug 2013
Location: England

PostPost by: s28ven » Sun May 05, 2019 3:31 pm

Chris, did you just run the fan through a relay/switch rather than have it on/off automatically?

Thanks,

Steven
s28ven
First Gear
First Gear
 
Posts: 15
Joined: 30 Sep 2014
Location: Glasgow

PostPost by: Chris » Sun May 05, 2019 8:54 pm

Hi Steven
I just made an adaptor plate drill to suit the original Lotus tubular mount, with another set of holes to suit the Toyota fan motor. Then connected the existing wires from the otter switch no relay was needed.
It is a long time ago, but I think the fan spindle hole had to be eased a thou or two. I can't be sure but it was no problem, and has performed well since 1991
Good luck
Chris
If this reply appears twice it is because of an internet glitch.
,
Chris
Second Gear
Second Gear
 
Posts: 86
Joined: 06 Aug 2013
Location: England

PostPost by: Bigbaldybloke » Mon May 06, 2019 12:01 am

I made a simple frame from aluminium angle and mounted two after market pusher fans on my Plus 2.
Attachments
3833a812-2c84-432b-86c1-ec836e698fb1.jpeg and
Change is inevitable, except from a vending machine!
Bigbaldybloke
Fourth Gear
Fourth Gear
 
Posts: 592
Joined: 16 May 2017
Location: Lincolnshire

PostPost by: 69S4 » Mon May 06, 2019 5:59 am

I bought a cheap pusher fan (10” iirc) from eBay about 10yrs ago to replace the original Lotus fan which, while it worked perfectly well, didn’t move enough air through the radiator. I welded up a lightweight frame to mount it using the original holes. The eBay fan moves a lot more air and does a much better job of temp control. It’s controlled, via a relay, by both an illuminated switch on the dash and a top hose mounted thermostat. Mostly I switch it on manually when the gauge needle gets too high but the thermostat is there if I forget.

If I was doing it again I’d probably go with two smaller fans rather than one big one. The reason is the air that comes off the fan blades does so in an annular form - a circle of air - as the bits of blade further from the hub are moving faster. The result is that much of the radiator doesn’t get any ‘benefit’. Two smaller fans would push air through more of the radiator.
Stuart Holding
Thame UK / Alpe D'Huez France
69 S4 FHC
Honda GoldWing 1800
Honda CBX1000
Kawasaki H1 500
Yamaha XS2
69S4
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1075
Joined: 23 Sep 2004
Location: nr Oxford UK

PostPost by: MarkDa » Mon May 06, 2019 8:55 am

No need to spend megabucks on a fancy fan.
There's a good selection on eBay add in a relay and thermostat and you're good to go.
My rad has a tapping for a thermostat so that's where it went..
I also reckon that fitting an old triumph spitfire mechanical fan that sits down over the pulley is a good move.
That way the electric fan is only really needed in hot weather/heavy traffic or after a fast run.

dsc_0025_16.jpg and
Sptfire fan
Last edited by MarkDa on Mon May 06, 2019 6:52 pm, edited 1 time in total.
MarkDa
Fourth Gear
Fourth Gear
 
Posts: 836
Joined: 15 Apr 2017
Location: Stroud

PostPost by: Davidb » Mon May 06, 2019 5:18 pm

I agree but forget the mechanical fan! I bought a fan on ebay for 20 dollars and it is fine.
https://www.ebay.com/itm/UNIVERSAL-SLIM ... 2a163eb121
Last edited by Davidb on Mon May 06, 2019 8:34 pm, edited 1 time in total.
'65 S2 4844
Davidb
Fourth Gear
Fourth Gear
 
Posts: 780
Joined: 02 Jul 2009
Location: Vancouver, Canada

PostPost by: Europatc » Mon May 06, 2019 7:27 pm

I fitted the coolex radiator and fan and they have been excellent
ImageImage
User avatar
Europatc
Third Gear
Third Gear
 
Posts: 391
Joined: 19 Aug 2010
Location: Hessle East Yorkshire

PostPost by: jeff jackson » Mon May 06, 2019 7:59 pm

Mine is from a Citroen ZX including the wiring harness and relay (built into the harness) from the local scrappy for a few quid.
Runs very fast, plastic, shrouded and absolutely no torque whatsoever, so if you do stick your fingers in it - it will stop and not cut them off like the origianl Lotus one. Weighs nothing as well. (well, next to nothing).
Jeff 72 +2
User avatar
jeff jackson
Third Gear
Third Gear
 
Posts: 360
Joined: 31 May 2004
Location: South of England

PostPost by: groucho » Mon May 06, 2019 8:49 pm

I bought this one, 10" FFD Dynamics Cyclone Ultra:
https://www.ebay.com/itm/10-INCH-FF-DYN ... 0732239953
...and this Derale 16759 adjustable fan controller:
https://www.amazon.com/gp/product/B000CN4XZI/

The fan fits my S2 radiator perfectly and I was very happy with the couple years I had it on before pulling the engine, and I expect to be very happy with it when the engine goes back in in a month or two!
Jeff Kyle
1965 Elan S2
2005 Elise
groucho
Second Gear
Second Gear
 
Posts: 92
Joined: 12 Nov 2009
Location: Rochester, NY, USA

Total Online:

Users browsing this forum: andrewk, LotusEngineeringBuff and 8 guests