32 replies to this topic

[whooshee1380]

Hi all could anyone tell me which way round a 6 blabe fan should fit,and should the fan draw air from then inner wing or should it blow air from the engine to the inner wing .AND WHICH WAY ROUND SHOULD A 11 BLADE FAN BE FITTED THANKS FOR HELP.

[Cooperman]

Whichever way round the fan is fitted it still blows air from inside the engine compartment through the radiator then out through the LH inner wing.
However, the fan must be fitted so that the pitch of the fan blades pushes the max. amount of air through the radiator; so the pitch angle of the blades should increase in angle relative to the running plane of the fan as it rotates clockwise looking from the radiator to the engine.
If fitted incorrectly the loss in airflow is around 20%.

[dklawson]

Look for curvature on the blades. Then install the fan as shown below.

engine ----- ( ------ radiator

[Wil_h]

The 11 blades are simple. They have 'engine side' moulded into them.

[whooshee1380]

Thanks for that guys.Im trying to run my 1380 cooler as soon as i slow down it starts to get hot then starts to bubble.ive got a stage 3 head inch an 3/4 su 286 cam lighten flywheel 3 branch manifold and a blanking sleeve insteasd of a themostat and a bloked off by pass hole,it has a 11 blade fan on it with a bigger pulley i tried fittig a 6 blade fan but it was to close to rad an this thing flys for a mini well i think so.ANY IDEA WOULD REALLY HELP THANKS WHOOSH

[Cooperman]

Thanks for that guys.Im trying to run my 1380 cooler as soon as i slow down it starts to get hot then starts to bubble.ive got a stage 3 head inch an 3/4 su 286 cam lighten flywheel 3 branch manifold and a blanking sleeve insteasd of a themostat and a bloked off by pass hole,it has a 11 blade fan on it with a bigger pulley i tried fittig a 6 blade fan but it was to close to rad an this thing flys for a mini well i think so.ANY IDEA WOULD REALLY HELP THANKS WHOOSH

With that spec you do really need a 6-blade export fan, plus an auxiliary electric fan for low speed, in-traffic situations. That's what I run on my 1310 cc rally 'S' and it is fine, although I do have to switch the elec fan on in traffic on hot days (what's a hot day?). With a 6-blade it won't need a bigger pulley as that reduces the volume of air moved through the rad.

[whooshee1380]

Cheers for that,the smaller pulley wiil it be any problems with it spinning the water faster? as i have heard it can.Im also not sure if the timing is right as iwas just set to get it past mot any idea were the timing marks should be set as ive bought a timig light so set it. THANKS AGAIN WHOOSH.

[Cooperman]

You won't have any problem with a small pulley and a 6-blade fan. I use up to 7000 rpm with the small (standard) water pump pulley and the 6-blade and it's fine.
You want the water to circulate well and with a blanking sleeve it can tend not to.
I suspect that you have the worst set-up you can have with blanking sleeve, large WP pulley and 11-blade fan whilst trying to cool a 1380 which has thin cylinder walls due to its overbore.
it would also be wise to fit an auxiliary manually switched electric fan under the wing outside the engine bay.
Make sure you also have a capilliary-type temp gauge as the electric ones are very inaccurate.

[whooshee1380]

Ok so im best off with a 6 blade fan and use a small pulley.If i take the blankney sleeve out which themostat should i use and would i need to change the water pump to an outlet one.I have had the by pass hole on the head welded up.Any other things which would help??? THANKS AGAIN WHOOSH

[Cooperman]

The blanking sleeve should be good with the small pulley and 6-blade fan. Having no by-pass hose is OK, but if you use a thermostat instead you should drill a series of 4 mm holes, about 6 off, around the edge of the stat. My advice is to stick with the blanking sleeve. Run with the heater valve always open to allow the heater rad to work as an additional heat-sink, but shut it off from air coming into the car or you'll get very warm!
With that done and an electric aux. fan under the wing it should be easy to keep at the right temp.

[whooshee1380]

CHEERS for that helps no end,i forgot to say it also seems to get press in the rad ive bin using a 15 lbs rad cap would this make any difference.Should i use a different pressure rad cap ?? I will be on with it tomorrow as took the rest of the week off to sort it .I have bin running it with the heater on as well to help it cool .THANKS AGAIN WHOOSH!!

[Cooperman]

A 15 psi cap should be ideal.
If you do as advised and it still runs hot the radiator could be suspect. However, a 1380 does tend to get 'a bit warm' because the cylinder walls are much thinner than a 1275 to 1330 cc engine and the heat gets into the coolant more readily. Do fit an electric auxiliary fan as well. By the way, check the ignition timing as a retarded ignition will cause a tendancy to overheat too.

[oltonlad]

i had a 4 blade on our mini when i first fitted the new engine, it lasted for a week as i didnt like the sound of it (too noisy)

here's what it sounded like with the 4 blade fan fitted.

Edited by oltonlad, 18 July 2012 - 08:48 PM.

[whooshee1380]

Hell thats ace as on mine you hear just the suck from the su then your off.I have got myself a timing light so wll try to set this as well any ideas on were the timing marks should be when the timing light is fitted and do i take the vacum pipe off.??? THANKS AGAI WHOOSH!!!!!

[ricekikr]

Oltonlad, all that whining is from the fan?

Sounds like a supercharger lol (or even straight cut gears)

Edit: You do have straight cut gears. You still heard the fan over the gears?

Edited by ricekikr, 19 July 2012 - 01:13 AM.