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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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thermo fans - which way to go?
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Wed, 16 July 2003 07:53
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I'm in the market for some thermos for the supra, and I'm wondering whether it's better to grab two mid-sized ones, or just a single huge one.
also, I assume brands dont matter for thermos.. would this be correct?
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Location:
Canberra
Registered:
May 2002
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Re: thermo fans - which way to go?
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Wed, 16 July 2003 08:07
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Yeah i dont really think its better to have either one or two, depends where u live i suppose and how much slow driving and sitting at lights u are gonna do. Just remember with 2 you gotta have a few anchor points for em, im not a big 'fan' of those things you are sposed to jam thru ur radiator fins and clamp. My mate stuffed his very expensive readiator because over time those bolts thru the radiator holding the fan had worn thru the tubes inside it.
I reckon new thermo's are way overpriced too, specially the brand named ones. I used 2 smallish thermos on my 1GGTE and ended up gettin them from a wrecker. They are a panasonic fan, and are very thin and push serious air! ($20) for both, i'll take the chance of having them 2nd hand) there barely on anyway!
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Location:
Brisbane
Registered:
July 2003
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Re: thermo fans - which way to go?
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Wed, 16 July 2003 08:49
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are you looking for an auxillary cooler or a fan completely devoted to the radiator?
davies, craig sell on (product id DC31) which is big enough to cool most engine independantly
but if your just after something to keep your car cooler than it is still using the original fan you can pick up an auxillary fan from most places like supercheap
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Location:
Brisbane
Registered:
May 2002
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Re: thermo fans - which way to go?
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Wed, 16 July 2003 08:50
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OEM fans are the way to go - cheap, robust and available in a huge range of sizes at your local wrecker. I'm using 2 MA70 aircon fans (the big ones that go inside the front bar) and they move a shiteload of air, plus they're a good fit in an MA61.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: thermo fans - which way to go?
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Wed, 16 July 2003 09:00
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what's their weight like norbie? they looked pretty hefty (tho I only had a casual glance)
I'm looking for a replacement for the stocker fan
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Location:
Brisbane
Registered:
May 2002
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Re: thermo fans - which way to go?
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Wed, 16 July 2003 13:39
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Weight? Pfft, who cares! As long as it keeps the engine cool, I'm happy.  They seem to weigh about as much as any other thermo fan.
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: thermo fans - which way to go?
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Wed, 16 July 2003 15:26
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i have 2 12" no name fans from supercheap weigh crap all and costed the same $50 each i think
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Registered:
June 2002
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Re: thermo fans - which way to go?
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Wed, 16 July 2003 20:48
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Norbie,
How are you switching the thermo's on the 2JZ??
What temp are you switching them on at??
I was thinking of using a VDO switch (95-90) on my 1JZ but not sure if that is getting too hot!?!?!?
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Location:
Cabramatta, NSW
Registered:
May 2002
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 Re: thermo fans - which way to go?
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Wed, 16 July 2003 23:10
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Very vague memory tells me that mine were set to 80 degrees...
My memory can be very untrustworthy though... Especially when remembering details from 5 years ago...
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Location:
Brisbane
Registered:
May 2002
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Re: thermo fans - which way to go?
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Thu, 17 July 2003 01:37
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I'm using a generic thermostat switch I bought at Supercheap. I dunno what temp it's set at, I just twiddled the knob until it seemed right.
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Location:
Brisbane, QLD
Registered:
February 2003
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Re: thermo fans - which way to go?
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Thu, 17 July 2003 03:15
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| Norbie wrote on Thu, 17 July 2003 09:37 |
I'm using a generic thermostat switch I bought at Supercheap. I dunno what temp it's set at, I just twiddled the knob until it seemed right.
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Oh so much inuendo
must....restrain......self 
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Registered:
June 2002
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Re: thermo fans - which way to go?
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Thu, 17 July 2003 04:38
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Is it one of those Davies-Craig ones that slips under the radiator hoses clamps??
I was thinking of getting a VDO switch, 90-85c (on-off).
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Location:
c'town, NSW
Registered:
May 2002
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Re: thermo fans - which way to go?
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Thu, 17 July 2003 04:48
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most toyota petrol engines run at around 82deg, my 1G thermoswitch is on90 off85 range.
its best to try and find out what temp the engine runs at (i think thermostat info might be a good source) and then choose a thermoswitch temp range to suite. rule of thumb is usually 'off' a coupla degrees higher than engine operating temp, and 'on' not being over 10 degrees more than operating temp
ohh and be sure not to get a thermo swith that has a 'off' temp lower than engine operating temp as the fans will never turn off... damn peps getting me wrong stinking switch[/mumble]
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Location:
Brisbane
Registered:
May 2002
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Re: thermo fans - which way to go?
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Thu, 17 July 2003 06:05
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| E30-323ti wrote on Thu, 17 July 2003 14:38 |
Is it one of those Davies-Craig ones that slips under the radiator hoses clamps??
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Yep, that's the one.
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I was thinking of getting a VDO switch, 90-85c (on-off).
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You mean you can't adjust it?
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Location:
Hobart, Tas
Registered:
May 2002
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Re: thermo fans - which way to go?
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Thu, 17 July 2003 11:16
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One thing I have been told with e-fans is that aftermarket ones tend to have higher (or is it lower) pitched blades than OEM, which means they move a lot of air at idle but actually restrict flow at high speeds. Also, the stock fan shroud helps the fan suck air through but you most liley have to ditch it to fit e-fans.
Wreckers here sell small (ie tiny) thermo fans for $40 and bigger ones for $65. Couldn't find somehting to suit though - the pair out of a 3sge (12 + 10 I think) early fwd camry looked the best bet in terms of depth etc, but the car had been front ended. Lots of old hondas have efans but they look tiny.
I have a single davies-craig 10" here I bought on EBay, and a thermostat kit from Repco that I havent mounted yet. I doubt a single 10" will do the job so I'm looking out for an OEM 10" or 12" to pair it with. Not too keen on punching bolts through the raditaor, so I guess I'll have to fab up some brackets somehow.
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Registered:
June 2002
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Re: thermo fans - which way to go?
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Thu, 17 July 2003 20:40
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The 1JZ thermostat has 82 on it, empirical tests showed it was fully open by 90 (started to open just above 82).
I've changed my thinking to a 95-90 switch in the top hose since the water will be the hottest when it comes out of the engine.
But you don't want the water to be too cool when it goes back in or the thermostat will start closing.
No they are not adjustable, the VDO switches is they all have the same fitting so if it isn't right then get another one and bolt it in. A bit tidier than having one of those probes sticking out of the radiator hose with the switch etc... hanging off it.
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Registered:
August 2002
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Re: thermo fans - which way to go?
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Fri, 18 July 2003 02:05
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Most people have ditched the clutch fan in order to get their conversion to fit. Thus thermo fans are required.
I think the idea is to have them on especially when idling and creating a heatsoak from no forward movement. But once the car gains forward momentum the air will flow through the radiator and cool the car to the point where the thermos can switch off, so the high speed flow of the thermos isnt all that important.
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Location:
Brisbane
Registered:
May 2002
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Re: thermo fans - which way to go?
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Fri, 18 July 2003 02:31
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Thermo fans are great for eliminating heat soak, especially after switching off the engine. My 2JZ used to get real hot after switching off, sometimes to boiling point, but now I have the thermos wired up to run all the time (via the thermostat of course). Temperature never climbs above the "normal" mark now.
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Registered:
May 2002
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Re: thermo fans - which way to go?
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Fri, 18 July 2003 04:51
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| BlackSupra wrote on Fri, 18 July 2003 12:05 |
I think the idea is to have them on especially when idling and creating a heatsoak from no forward movement. But once the car gains forward momentum the air will flow through the radiator and cool the car to the point where the thermos can switch off, so the high speed flow of the thermos isnt all that important.
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Exactly as mine is setup to do. I run a pair of twin-thermos from (of all things) a 1994 EF 6-cylinder Falcon - an almost perfect fit for the Cressida's (stock) radiator...pics of the assembly on the web-site.
On at 90, off at 85.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: thermo fans - which way to go?
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Fri, 18 July 2003 23:10
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I'm guessing my best idea would be to take the car for a drive, and find out what temp the microtech is reading at cruise speed, and make sure the off speed is somewhere a bit above that... correct?
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Location:
Newcastle
Registered:
May 2002
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Re: thermo fans - which way to go?
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Sat, 19 July 2003 01:37
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I got a pair of 10'' fans from warners bay wreckers for $11. Whether you use a big single or twin fans would depend on the shape of your radiator.
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Location:
Melbourne
Registered:
April 2003
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Re: thermo fans - which way to go?
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Sat, 19 July 2003 06:48
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Ok here is dumb question,
How do the thermo fans work?? do they replace your radiator? or do they replace only the fan??
Thanks
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: thermo fans - which way to go?
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Sat, 19 July 2003 07:55
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lol
it's a replacement for the engine fan, to keep the radiator cool.
I'm installing them because the factory setup is a bitch to get working properly after a transplant.
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