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  Author    Right - join Part A to Part B etc, etc, etc  (currently 64,149 views)
Graham Bichard
Posted on: March 2nd, 2022, 15:07:37 Quote Report to Moderator
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Okay, so I've got the throttle cable and speedo cable to fit to the car now, but with the clock's going forward later this month and hopefully some lighter (warmer!) evenings looming, I'm thinking about the cooling fan solution I need to improve the cooling system.
Having established that I need a second 7" fan on the radiator, I'm thinking something like this:
https://www.coolexperts.co.uk/product/universal-7-inch-car-radiator-fan/
(I'll try and dig out the receipt I'll have somewhere, and get exactly the same as the one I have)
But I've been thinking about the wiring of this (I've studied the wiring diagram linked to by Neil).
The concern I have is in trying to use the existing loom wiring, will the likely current draw for two fans be too much for the MPi Mini loom wiring?
I think I've mentioned before I don't mind if both fans operate at the same time (I think Neil, you mentioned that you had a second thermostat for the second fan and a separate switch).
So how should I try to wire this thing in - as mentioned many times before, I'm not a fan of electrics.
Cheers.
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Graham Bichard
Posted on: March 5th, 2022, 13:44:11 Quote Report to Moderator
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So the new throttle cable wasn't exactly the correct length, despite numerous measurements and drawings to explain what was required.  This wasn't unexpected and is absolutely no reflection on Speedy Cables work - the cable is too long by design, rather than too short.
To that end I bought a cable kit, used one of the end fixings to create this:

Obviously I haven't cut/splayed the cable end, simply soldering the end piece in place.  This could be a point of weakness - we'll see.
While doing this I fired up the car and allowed it to warm through again (the car hadn't been started for a few weeks).  The last time I did start the car, the alternator wasn't charging - it was the same situation today.  Another electrical issue to deal with :/ .
But first once the engine's cooled I'll trial the throttle cable and if it works, I'll drive the car onto the ramps and look to fit the speedo cable next.
I've fitted the heat wrap to the new speedo cable.  This was also fitted to the old cable but despite this, the cable was routed such that it rested against the manifold and the cable outer was damaged.
The new speedo cable has a longer drive protrusion at the speedo head end which I hope will allow the speedo to work (fingers crossed).

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Graham Bichard
Posted on: March 9th, 2022, 12:55:36 Quote Report to Moderator
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Gone through my list of receipts and found the exact fan so thought I'd record it here so I don't have to search through it again- bought it from Merlin Motorsport:
https://www.merlinmotorsport.c.....fan-65?pn=RAD-FAN-65
Price has gone up a bit - last one cost £48.

I'm also thinking if wiring a second fan in as a separate circuit, controlled by it's own switch might be the easier option.

Last modified March 9th, 2022, 12:56:39 by Graham Bichard
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Roger Garland
Posted on: May 9th, 2022, 13:57:09 Quote Report to Moderator
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Hi Graham
I followed the Merlin link - that's quite a small fan, but if it's what you need, ok
Electric fans can be obtained through the owners club, but they are about 9" in diameter
The club fans are the correct size for the club radiator - and they are rather less expensive
I guess a club fan would be too large for the application you have in mind?
Roger
Club Secretary
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Graham Bichard
Posted on: May 10th, 2022, 13:57:35 Quote Report to Moderator
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Roger - yes, a 9" fan is too large for the Fiat Cinq radiator I'm using.  By chance I already had a 9" fan that I've already offered up.
I've now got another fan of the same size/type to fit to the car, and have had it confirmed that the original MPI loom I'm using can handle the current draw if I wire the two fans in series.
So now all I have to do is get it fitted...
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Craig Smith
Posted on: May 11th, 2022, 08:55:26 Quote Report to Moderator
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Hi Graham,

If you wire the fans in series, they will run at approx half speed.  

I would use the MPI feed to drive a relay and wire the fans in parallel from another 12V feed (probably from the perm live on the solenoid given its proximity).
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Graham Bichard
Posted on: June 25th, 2022, 17:26:52 Quote Report to Moderator
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Craig, sorry for the late reply.  Been busy with work (and a trip to France) recently, but I haven't forgotten about this.
Reading your post reminded me of school, using the peg boards, spring wire connectors and light bulbs - putting two in, they both light but a half brightness.  I wonder if they still do that in schools today?
Anyway - I dug out my of Automotive Electrics (by one John Dickens) which on Pg70 has a cooling fan wiring diagram which is essentially what I need.  So will look at the feed/earth as you describe and look at installing a hidden manual switch rather than a temperature operated switch.  (By hidden I mean not protruding for the purpose of IVA compliance)

Just need to pull my finger out and get on with it.

ETA - how do you 'spec' a suitable relay?

Last modified June 25th, 2022, 17:28:02 by Graham Bichard
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Graham Bichard
Posted on: July 3rd, 2022, 09:29:39 Quote Report to Moderator
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Not wired, just put in place:

ETA - The front of the car is the top of the photo.

Last modified July 3rd, 2022, 09:30:51 by Graham Bichard
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Graham Bichard
Posted on: July 3rd, 2022, 09:47:41 Quote Report to Moderator
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I've copied this circuit from Mr Dickens book (Pg49), replacing the thermostat switch with a two position (on/off) switch that can be controlled manually from inside the car.

Any comments welcome.

How/where would be best to take connect to the ignition?
I'll dig out the spec of the fan, compare this information (expected current draw) with the standard MPi fuse rating. Also chose a suitable relay (I've now got a copy of the AES catalogue to help me find out what is available).
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mike brown
Posted on: July 3rd, 2022, 16:04:22 Quote Report to Moderator
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Why not have a thermostatic switch in parallel to the manual switch at least then it'll work automatically but if you know its likely to get hot you can switch it manually.
Mike
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