i have a hilux that im building up and im putting the radiator in the rear which is out of a 100s landcruiser should i run twin or a big single thermo to keep it cool any advise would be great
cheers justin
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1 thermo or 2
Moderators: toaddog, TWISTY, V8Patrol, Moderators
IMHO the rule of thumb is, you should use the biggest fan you can physically fit. And then if there is still room for a second, fit a second.
Basically one 16-inch fan will move about the same amount of air as two 14-inch fans. The only thing is that in your case, with the rad in the rear, you are completely stuck if your fan dies, because you can't rely on air flow from driving at highway speeds to keep your engine cool.
Here's some info to compare air flow from different sizes: http://www.daviescraig.com.au/documents ... _specs.pdf
But then some fans are claiming heaps more; this one is a high-rpm 16" claiming 3600cfm, nearly double what Davies-Craig claim for their 16" model. It would have to be very noisy but at least there are options for better cooling if the fan you choose turns out to be a bit too weak.
I think with a rear-mounted one you'd want a well designed shroud and to space the fan(s) away from the radiator a bit, not have them mounted hard against it.
Basically one 16-inch fan will move about the same amount of air as two 14-inch fans. The only thing is that in your case, with the rad in the rear, you are completely stuck if your fan dies, because you can't rely on air flow from driving at highway speeds to keep your engine cool.
Here's some info to compare air flow from different sizes: http://www.daviescraig.com.au/documents ... _specs.pdf
But then some fans are claiming heaps more; this one is a high-rpm 16" claiming 3600cfm, nearly double what Davies-Craig claim for their 16" model. It would have to be very noisy but at least there are options for better cooling if the fan you choose turns out to be a bit too weak.
I think with a rear-mounted one you'd want a well designed shroud and to space the fan(s) away from the radiator a bit, not have them mounted hard against it.
This is not legal advice.
You can't go past the AU-BA-BF twin thermo setup..
Available new for as little as $100 if you look around.
Here's a set on Ebay for $165.
http://cgi.ebay.com.au/Ford-AU-Falcon-F ... 240%3A1318
Jas.
Available new for as little as $100 if you look around.
Here's a set on Ebay for $165.
http://cgi.ebay.com.au/Ford-AU-Falcon-F ... 240%3A1318
Jas.
yeah not 100% sure they are 16's
but think they are
could be 14's
but yeah i have no probs at all
i used to live in the hills etcand drove it hard and never gothot
i havenever had it go past the half way mark really
even hot day stuck in traffic
but think they are
could be 14's
but yeah i have no probs at all
i used to live in the hills etcand drove it hard and never gothot
i havenever had it go past the half way mark really
even hot day stuck in traffic
What I like to say to the buy a GQ thing....
my MQ is a convertable, hows about your GQ! The Finger
my MQ is a convertable, hows about your GQ! The Finger
Be very careful of the way the fans you are proposing are rated and how your shroud is constructed.
Factories do lots and lots of engineering work, and masses of testing both on the dyno and in the outback/death valley etc to ensure there is adequate performance from a cooling system.
I've seen lots of cars with thermo fans fail to deliver under challenging circumstances, including hiluxes with commodore conversions.
Having seen the way that davies craig rate some of their products, I am suspsicious that they aren't always going to deliver what it looks like they can. (see note below) SPAL, I m aware, offer very good data on their fans' performance.
Personally, I wouldn't use davies craig unless I had a massively overengineered cooling system and could get away with poor fan performance.
That's not going to be the case with a V6 in a hilux though - that engine bay gets full and they have a small frontal area.
You need to shroud the fan so the whole radiator is being utilised, and bear in mind that trying to match the flow of a mechanical fan at high engine speed with an electric fan is very hard.
You may need to look at 2 stage fan control - stage one from 85-90 deg maybe, and second stage from 90deg up - with a 16" puller for normal use and a 16" pusher for "boost" Running both all the time might make for unsustainable current draw and mind-numbing noise - I've certainly heard a SPAL 16" inch puller in operation and it was LOUD.
That AU setup is the business - but on an AU radiator, where it fits the way ford intended and pulls the whole radiator. Also, sure, the ebay item will work for a while or help someone fix up their $1500 junker ex taxi, but will it perform after being full of mud, or after a hit with the pressure washer? I dunno...
Note re davies craig - (did you know their electric water pumps have a quite short rated life - 1500hrs from memory - that's only a couple of years for the average car... now bear in mind the consequences of electric water pump failure - tha's not a leak, that's a total loss of flow without warning. Odds are that's going to result in engine destruction - electric water pumps are cool - I'm running them in my 660 cc engined suzuki, but I'm not running Davies Craig.... I'm just not sure they are up to Original Equipment quality.)
Just some thoughts to bear in mind.
Steve.
Factories do lots and lots of engineering work, and masses of testing both on the dyno and in the outback/death valley etc to ensure there is adequate performance from a cooling system.
I've seen lots of cars with thermo fans fail to deliver under challenging circumstances, including hiluxes with commodore conversions.
Having seen the way that davies craig rate some of their products, I am suspsicious that they aren't always going to deliver what it looks like they can. (see note below) SPAL, I m aware, offer very good data on their fans' performance.
Personally, I wouldn't use davies craig unless I had a massively overengineered cooling system and could get away with poor fan performance.
That's not going to be the case with a V6 in a hilux though - that engine bay gets full and they have a small frontal area.
You need to shroud the fan so the whole radiator is being utilised, and bear in mind that trying to match the flow of a mechanical fan at high engine speed with an electric fan is very hard.
You may need to look at 2 stage fan control - stage one from 85-90 deg maybe, and second stage from 90deg up - with a 16" puller for normal use and a 16" pusher for "boost" Running both all the time might make for unsustainable current draw and mind-numbing noise - I've certainly heard a SPAL 16" inch puller in operation and it was LOUD.
That AU setup is the business - but on an AU radiator, where it fits the way ford intended and pulls the whole radiator. Also, sure, the ebay item will work for a while or help someone fix up their $1500 junker ex taxi, but will it perform after being full of mud, or after a hit with the pressure washer? I dunno...
Note re davies craig - (did you know their electric water pumps have a quite short rated life - 1500hrs from memory - that's only a couple of years for the average car... now bear in mind the consequences of electric water pump failure - tha's not a leak, that's a total loss of flow without warning. Odds are that's going to result in engine destruction - electric water pumps are cool - I'm running them in my 660 cc engined suzuki, but I'm not running Davies Craig.... I'm just not sure they are up to Original Equipment quality.)
Just some thoughts to bear in mind.
Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
I like these too. I would be tempted to grab the matching radiator as well, because it would have to be easier to mount them to it.want33s wrote:You can't go past the AU-BA-BF twin thermo setup..
Available new for as little as $100 if you look around.
Here's a set on Ebay for $165.
http://cgi.ebay.com.au/Ford-AU-Falcon-F ... 240%3A1318
Jas.
But going back to what I was saying before, remember that for any given manufacturer, their 16" fan is going to be approximately as effective as two of their 14" fans.
Do you happen to know the dimensions of the AU fans... I mean the whole shroud etc?
This is not legal advice.
I had a set of these and a matching radiator in an EB2 XR8. Definately worth grabbing a matching rad as it has the mounting points cast into the plastic and the fans and shroud slid into place on it.
EL-AU were single speed fans, EF were dual speed. 3 wires per fan instead of 2. Have long sold the car so don't have any dimensions sorry Chimpy. Were reasonably shallow though and made the car much easier to work on. Do have some pics at home of the fans out of the car.
EL-AU were single speed fans, EF were dual speed. 3 wires per fan instead of 2. Have long sold the car so don't have any dimensions sorry Chimpy. Were reasonably shallow though and made the car much easier to work on. Do have some pics at home of the fans out of the car.
-Mal
Zook 1, 2, 3 gone
Patrol - Wheels, engine and stuff
Zook 1, 2, 3 gone
Patrol - Wheels, engine and stuff
Side issue, as I posted in the Auto Elec section, it isn't hard to make the one-speed fans into two-speed fans if you need to, it just involves a very cheap and easy trip to a local Pick-a-Part sort of wrecker.
Funny the earlier falcons had dual speed fans when later ones didn't...
Funny the earlier falcons had dual speed fans when later ones didn't...
This is not legal advice.
How thick are these? Will they fit between the rad and a 4.2 petrol?chimpboy wrote:I like these too. I would be tempted to grab the matching radiator as well, because it would have to be easier to mount them to it.want33s wrote:You can't go past the AU-BA-BF twin thermo setup..
Available new for as little as $100 if you look around.
Here's a set on Ebay for $165.
http://cgi.ebay.com.au/Ford-AU-Falcon-F ... 240%3A1318
Jas.
But going back to what I was saying before, remember that for any given manufacturer, their 16" fan is going to be approximately as effective as two of their 14" fans.
Do you happen to know the dimensions of the AU fans... I mean the whole shroud etc?
Dave
I'll give it a go!!!!!
approx (ignoring brackets) 680w x 450h x 95 thickCruiserPatrol wrote:How thick are these? Will they fit between the rad and a 4.2 petrol?chimpboy wrote:I like these too. I would be tempted to grab the matching radiator as well, because it would have to be easier to mount them to it.want33s wrote:You can't go past the AU-BA-BF twin thermo setup..
Available new for as little as $100 if you look around.
Here's a set on Ebay for $165.
http://cgi.ebay.com.au/Ford-AU-Falcon-F ... 240%3A1318
Jas.
But going back to what I was saying before, remember that for any given manufacturer, their 16" fan is going to be approximately as effective as two of their 14" fans.
Do you happen to know the dimensions of the AU fans... I mean the whole shroud etc?
Dave
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