48 replies to this topic

[N/A-PWR]

a standard blade would Gene,

 

the one I had on the HR-X2 did. 

http://www.gmh-toran...or/#entry908000

[StephenSLR]

Basically.........yes, realistically useless in the real world.

 

Once the A9X gets on a bit or the motor is warmed over or the day is particularly hot in slow traffic they still boil over.

 

 

^ Yes but look at the A9X fan. If this is all there is to them, 10" and sitting in mid air? Without a shroud enclosing the sides to help push more air into the radiator core; air would've been spilling out the sides all over.

 

s

Edited by StephenSLR, 23 June 2015 - 09:48 PM.

[N/A-PWR]

Tim made me do it,

 

a front Fan Job:-

 

never seen fans with a shroud in front

[IMORAL]

 
But as said StephenSLR said: "...a fan and shroud behind will draw air from the corners more efficiently than if you have the same fan and shroud in front trying to push air to all four corners."[/quote]

Yes. Which is why I said they are useless in the front. Air only can go through the opening where the fan is when mounted in the front.

Did you find a dual switch Peter?

[76lxhatch]

^ My switch is something like 95 on, 91 off I think? The coolant thermostat sits the gauge just over quarter and the fans allow it to rise to just over half. Could go a little cooler but its good to have a gap to avoid having the fans come on when not needed. A running fan can be a greater obstruction to air flow than one which is free spinning.

 

Current fan is a single thermo in no shroud which is useless.

 

Most modern style fans have adequate shrouding to make the fan effective in the standard packaging/mounting. However - it needs to be against the radiator or somehow sealed to it so the only air drawn is through the core. The other important thing is that if it does not cover a big enough area of the core then a deeper shroud of suitable shape will allow it to draw through a bigger area.

I like twin 14" also, as they fit nicely in the HQ-HZ radiator and cover the entire width of the core (i.e. every fin receives some air flow - a few in the middle don't get much but the majority is still covered). Requires recessing and adding to the flanges at the back for sealing, and trimming the chassis rails a little to make them fit. I also prefer to block as little passive flow as possible, so this is a good alternative to a big shroud.

[StephenSLR]

I reckon you see most fan setups on the engine side as the aircon condenser is in front with bugger-all room in between.

 

This is definitely one reason; another reason is chassis design. In the old days we had belt driven fans and cars were designed to have a good space between engine and radiator with not so much space in front; unless you're talking old Chevy's, lol. Many with old Chevys will put the thermo fan in front because there is so much room there.

 

If the engine is too close to the radiator and more room in front, then the fans will be located out front.

 

 

Which is why I said they are useless in the front. Air only can go through the opening where the fan is when mounted in the front.

 

But they are not 'useless' in the front; "pushing air only through the opening where the fan is" is still sufficient enough to keep the engine running at recommended temperatures; hence why many manufacturers do this.  Even with the shroud in front, there is resistance from the cores and filaments, bulk of the air will pass through but some air will be spread out to the sides and escape through the radiator corners as the shroud prevents air from escaping in front.  Of course any bugs and debris caught in the filaments cause an increase in resistance and it's a hassle to remove the fan each time you want to clean the rad.

 

It may not be as efficient as the same system behind but to say it is "useless" infers that it doesn't work at all; which is totally untrue. It works successfully in countless applications.

 

s

Edited by StephenSLR, 24 June 2015 - 07:28 AM.

[TerrA LX]

I did well with this Fan on the fully worked 6:-

 

 

When revving the ring out of the motor, the blades flex straightish   ,

 

coupled with the triple core HQ radiator, no problems. 

80 miles an hour non-stop.

They do crack over Time, so check.

With a 3 core HQ radiator you probably did not need an engine fan at all.

 

Those flex fans are one of the worst you could run.

[TerrA LX]

From memory the VS V8 had an additional fan in front for aircon with the engine driven fan at the back.

Correct

 

 

I always thought a fan would push better than suck?

 

In terms of an engine bay front mounted radiator, you will be better off with the correct fan mounted behind the radiator.
Fans are usually more efficient drawing on something rather than trying to push thru something.

[TerrA LX]

Basically.........yes, realistically useless in the real world.

 

Once the A9X gets on a bit or the motor is warmed over or the day is particulary hot in slow traffic they still boil over. So A9X owners have been force to fit a mechanical fan or upgrade the radiator or fit bigger electric fans..................I have even seen all 3 done on one car.

 

You telling me that every road going A9X Torana was returned to the dealers for cooling system rectification work?
 

Edited by TerrA LX, 24 June 2015 - 08:55 AM.

[StephenSLR]

Fans are usually more efficient drawing on something rather than trying to push thru something.

 

http://youtu.be/Kk7JMOcypus?t=123

 

^ According to this guy's tests; the best was push-pull (one fan in front, one fan behind).

 

As for single fan configurations in front or behind; they are very close; running temperature within one degree of each other.

 

Surprisingly; if you have a gap between fan and rad, pull is not as good because air is drawn in from the sides I guess that makes sense as the air on the sides has no resistance; this was surprising as I assumed a fan in front with gap; would have more air escaping out the sides but more is pushed through than pulled. Of course a shroud stops air escaping/entering the sides.

 

s

Edited by StephenSLR, 24 June 2015 - 09:10 AM.

[TerrA LX]

Hi TerrA LX, to answer your question directly....No.

 

The problems occurred long after the dealer 12 month warranty expired.

And correct service procedures long forgotten...

[N/A-PWR]

You may well be right TerrA,

 

But did you know they sound good too. 

 

is like flying in a Cessna Airplane when at 120 MPH,

 

which use to keep me coming back for more. 

 

With a 3 core HQ radiator you probably did not need an engine fan at all.

 

Those flex fans are one of the worst you could run.

[Stedz_lc]

Ive always fitted fans to the engine side, by my blown setup doesn't allow for it, has to go in front :(

hope it works! time will tell

keep  the talk and photos coming I like this discussion

cheers

[IMORAL]

Ive always fitted fans to the engine side, by my blown setup doesn't allow for it, has to go in front :(
hope it works! time will tell
keep  the talk and photos coming I like this discussion
cheers

are you able to move the radiator forward. Mine won't fit either because of the blower but I have the room to move the radiator forward.

[Dave6179]

I did well with this Fan on the fully worked 6:-

 

 

When revving the ring out of the motor, the blades flex straightish   ,

 

coupled with the triple core HQ radiator, no problems. 

80 miles an hour non-stop.

They do crack over Time, so check.

I have my cracked one on the wall in the shed. Then found the Flexalite unit.

[Orange SS]

I have twin thermos on the engine side with no shroud and one on the front for the factory air con(not sure if this was standard but it only turns on when the air con is on). I have a 4 core radiator and no over heating issues even here in QLD on a +35 deg day.

[Stedz_lc]

I could move it forwar but it would reduce the radiator size ALOT in which it would make it worse then fans infront