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swindon_alan

Coolant radiators, fans and cowlings

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As per other recent posts, I bent my V8 a few months back and I am sorting out spares for the damaged parts. The front end took quite a whack and the air con and coolant radiators and the fan assemblies are really unwell:

 

post-18669-0-54189500-1428681341.jpg

 

Fortunately I was contacted by a kind chap who had a whole rad assembly from a Lotus V8 development car, which I then purchased:

 

post-18669-0-54065800-1428681397.jpg

 

I'm going with a new ally coolant radiator from Radtec:

 

post-18669-0-46203700-1428681453.jpg

 

http://radtec.co.uk/products/536/Lotus-V8-Esprit.htm

 

I had a look at prices, SJ can supply the cowling for £90, the fans and motors for £60 each and the fan mounts in stainless for £30 each. They also do an ally radiator for £445 (sourced from Radtec?) That's all a bit more than I want to pay so I'm going to refurbish what I have and build up a new assembly from the best bits from both cars.

 

That leaves me with a spare original radiator and I was wondering which Esprits it would fit when I advertise it. Here we go again..! I decided to go through the model parts lists yet again and find commonality.

 

S1/S2:

 

post-18669-0-80495100-1428682248.jpg

 

Later S2

 

post-18669-0-40754700-1428682282.jpg

 

Turbo up to '87

 

post-18669-0-46887500-1428682306.jpg

 

'87 Turbo

 

post-18669-0-62843900-1428682327.jpg

 

'88 to '92

 

post-18669-0-18991900-1428682368.jpg

 

'93 on

 

post-18669-0-43034900-1428682391.jpg

 

V8

 

post-18669-0-30132400-1428682414.jpg

 

To sum all of this up:

 

post-18669-0-90991500-1428682437.jpg

 

...which means that my spare rad, an A082K4237F will fit most Esprits after the S2 which is good news :D

 

I've seen a lot of posts about upgrading the fans to Spals or Kenlowes but I want to try and keep mine fairly original. So on to the fan motors, just in case I need one:

 

post-18669-0-17612600-1428682591.jpg

 

A Ford part and I've read before on the forum that these are used on the Ford Fiesta Mk I  and indeed when looking up the part number (93FB-8K620-AA) Fordopedia lists them:

 

post-18669-0-20898600-1428682728.jpg

 

And digging a bit deeper Yoyopart lists a shedload of info on them:

 

http://www.yoyopart.com/oem/168356/ford-93fb8k620aa.html

 

You get the 5 blade fan and the motor, obviously the cowling would be redundant:

 

post-18669-0-01067200-1428682919.jpg

 

And interestingly used on nearly every Ford in the '80s/early '90s (cut down list):

 

post-18669-0-01308100-1428683005.jpg

 

Which in summary is roughly:

 

Fiesta Mk I 83-86
Fiesta Mk II 86-89
Fiesta Mk III 89-92
Escort Mk III 80-85
Escort Mk IV 85-90
Escort Mk V 90-92
Orion 83-86
Orion Mk III 90-92
Sierra 82-86
Sierra 87-93

 

Readily available from a large number of manufacturers too:

 

post-18669-0-28733500-1428683077.jpg

 

Looking back at the part numbers I think this should be good for most plastic fanned Esprits from the Turbo onwards.

 

Cool!

 

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Nice One Alan,

 

    That's another very useful piece of info that your endeavors have turned up. Thanks for sharing this with us all.

 

Robbie

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You have the patience of a saint and the tenacity of a hungry fox.

I threw mine on the floor in a pile of busted parts when replacing the rad. Three new highflows tech bolted onto the frame rinsed me for £47 off eBay delivered - much cheaper than the original. But it's not original....... So hats off to you fella

Hope the patient is recovering well.

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Nice work Alan, maybe one of the mods can move this info to the parts cross ref section ?

Last summer I renewed my radiator and upgraded the radiator mounting cage and fan mounts to stainless steel. I bought the parts from Geoff @ esprit engineering, they weren't a huge amount of money

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The new replacement fan units are slightly larger and heavier than the original (well the one I got). I also managed to get some new old stock original Ford units from Ebay (they pop up now and again) rather cheaper.  

 

Also I found that some of the replacement units have a different current rating (lower if I remember correctly) than the Ford original units so will possibly be not quite so effective.

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Thanks very much gents, I enjoy doing this sort of "forensic" work. It gets things sorted for me and hopefully saves others some time.

 

Nice work Alan, maybe one of the mods can move this info to the parts cross ref section ?

 

I was thinking about that when I posted this, but the parts cross reference sections are model specific in the individual forums and I like to cover all of Esprit models if I can.

 

Oh just realised I haven't done my heater blower motor yet, will post that up in the next few days... ;)

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Have you thought about the Alunox rad pack, Alan?

 

Hello Ian, yes I did consider it, but there are several factors against me joining in:

 

- the oil coolers on my car are nearly brand new

- the price of £1,700 is outside of my budget

- I don't need a Chargecooler rad!

- it is very nice but moves quite a long way away from originality

- the lead time is a couple of months and I want the car back on the road by Mayday!

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im going spal on mine do you now what the flow rate is suppose to be on these stock fans alan 

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@Alex Carter- those cheapies I fitted on my old car were bloody great - once they cut in the temp dropped like a stone!! They were never on for very long at all - the flow was measured in the lots.....

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I can't take a risk on cooling it's like brakes and tyres . The difference between a 20 quid fan and a 70 quid fan could cost 10 k on an engine .I get ya point but I'll stick with the named brand 

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Understand that completely  - my country boy logic was I was taking two pants ones off a Ford Fiesta off and sticking three on....... Like all my classic cars I've owned - my eyes always never far from the gauges or the road !!! 

It was very noticeable the difference it made - the fiesta ones stayed on for what seemed like ages....... The three new ones for about 30 seconds at best..... It really did cool it down rapid.

tis always best to air on the side of caution though - I really get that

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While I am all in for some good weather proofed SPAL fans, I am thinking this: on some engines, there is a thermostat regulating the amount of cooling area and coolant. If this is regulated too fast, it may cause a warped head. I suspect it will not be the case on our cars, using the fast cooling down fans, but never the less, I'd give it some thought.

I am using original fans on my 1990 SE for the moment. Thinking about the SPAL ones mentioned, and suspend them in rubber mountings in the original fan cowling to avoit contact and vibration, plus get the directed airflow from the cowling. And save some weight ;)

Any sense it this?

Cheers,

Jacques.

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Given the restricted path that air has to take in order to cool the engine (past the charge-cooler rad and air-con condensers), I've been surprised that the Esprit manages to keep cool at all, yet it seems to do so in my case, at least. When I bought my car, only one fan was working, although I didn't know it at the time, but it still didn't overheat.

I'm not a lover of the ABS fan shroud, though. While I'm having the original coolant radiator rebuilt, it will be fitted with three Spal fans without the shroud. Just my personal preference.

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The shroud is to draw the air through the radiator fins instead of sucking it in from any old where. You'll lose a lot of the fans' efficiency if you leave it off.

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7 hours ago, Jacques said:

If this is regulated too fast, it may cause a warped head. I suspect it will not be the case on our cars, using the fast cooling down fans, but never the less, I'd give it some thought.

One of the engine tests required by Lotus was to run at max RPM for a sustained period of time then immediately dump the coolant then replace it with ice water. To pass it had to suffer no ill effects, and of course it passed. Honestly, don't worry about fans cooling it too quickly... :) 

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Thanks for the reassurance. Tough test. I seem to remember a certain Lotus Elise with a early type Rover engine, which cools suddenly and too quickly, therefore warping it's cylinderhead. At least there are some talks of this in the Danish Lotus Club. Anyway, I also believe the fanshroud is there for the purpose to max the efficiency in directed airflow. I also think there is too much parasitic drag in the original fans. In relation to this I was told by a parts dealer from the UK, that I should keep the 1990 fan type, rather than changing them to the later V8 spec. type, as I was told they are actually weaker made and not as weatherproof as the early type. SPAL it is then.

Kind regards,

Jacques.

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The well documented Elise cooling issue is to do with the first time the thermostat opens from a cold start.

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1 hour ago, Advantage said:

The shroud is to draw the air through the radiator fins instead of sucking it in from any old where. You'll lose a lot of the fans' efficiency if you leave it off.

I'll let you know how it works out.

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All of that assorted clutter trash got discarded on mine - most of it broke when it had to be encouraged free.......

fans clamped directly to the rad - worked very well with three hi flow units rather than 2 low rate ford things

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15 hours ago, Barrykearley said:

All of that assorted clutter trash got discarded on mine - most of it broke when it had to be encouraged free.......

fans clamped directly to the rad - worked very well with three hi flow units rather than 2 low rate ford things

 

My thinking is that when the fans are off (generally once the car is moving along at a reasonable speed), the air has to negotiate the radiator pack, and I feel it's better to allow if to pass as freely as possible, and the S4s has three separate coolers for it to get through.

The ABS shroud supports the fan mountings, but it's not really deep (or aerodynamic enough) to be of any real use at speed, and I feel it blocks the flow apart from where there are openings in it. It works well at lower speeds around town, where the fans are dragging air through the pack, but with improved capacity fans (like the Spals), you get the best of both worlds, unrestricted at speed, but still with enough airflow at lower speeds.

Or I hope that's the case, anyway. It could all go wrong, but that's to be proved in a few week's time.

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Did I read somewhere that the fans come on in stages-1/2/3? This thread was the best I could find to have that info but its not here.

Standing at the front of my v8 looking back, there are three fans. How do they come one? Is one at "low" high temps, tow at "medium" high temps and three at "high" high temps? Which ones?

What about the aircon-which fans come on with it on please? all three? I don't know as my aircon doesn't work, and I cant get underneath it when the engine is running and the fans are on-but it sure pushes out a lot of heat from under the car!

I need to know this as it will affect where I place the shorter condensor I end up using-it needs to be in front of the fans that work with the aircon, if there is only two?!

Thanks all...nearly there..

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