Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

thermo fans

Started by shanegtr , Jul 01 2006 10:49 PM

Please log in to reply

10 replies to this topic

#1 shanegtr

Forum Fixture

Members
533 posts

Name:Shane
Location:Tom Price, Pilbara WA
Car:LJ 2 door
Joined: 10-November 05

View Garage

Posted 01 July 2006 - 10:49 PM

Just installed my new triple flow rad last weekend and took the car for a run without the 16" single thermo that was on the old radiator. At highway no problems at all, temps acually come down once hot, which never happened in with the old one. It just used to get hot and stay there :<_<:

Anyhow the old thermo was mounted through the rad which I didnt like. And looking at the radiator after I removed it I wasnt far off holing at least 3 sections of tube :cry:

. Anyhow, back to the question, I was thinking of installing 2 10" fans as the single 16" is a tight squeeze in there. Plus it will be easier to make mounting brackets for a smaller fan. Would twin 10" fit infront of the LJ rad ok? Should I wire them to both come on at the same time or run one of the temp controler and the second manually for when the temp starts to climb?

Back to top

#2 _devilsadvocate_

Guests

Posted 02 July 2006 - 12:36 AM

While im not sure of what type of 16in fan you have, if its a Dcraig or off a commodore it will move more air than 2 x 10in fans.
Possibly the 2 x 10in will be enough with your better rad.
I dont see any value in having one fan come on by the thermostat and the other manually.......it only brings human error, it will happen eventually you cant watch the temp gauge all the time. Its not going to preserve the life of the fans any more than having them both on the thermostat, when triggered theyll run for half as long as when only one wired in.

Back to top

#3 shanegtr

Forum Fixture

Members
533 posts

Name:Shane
Location:Tom Price, Pilbara WA
Car:LJ 2 door
Joined: 10-November 05

View Garage

Posted 02 July 2006 - 01:10 PM

Fair enough. The old fan was just some no name jobbie. Was on the car when I got it. Looks like it will be both fans running together then

Back to top

#4 gtrboyy

Lotsa Posts!

Members
3,137 posts

Location:SYDNEY,NSW
Joined: 07-November 05

Posted 02 July 2006 - 03:07 PM

Air con fan off a vr-vs work really well & are cheap.

Back to top

#5 enderwigginau

Admin Wrangler

Moderators
2,000,527 posts

Name:Grant
Location:Brisneyland
Car:76 LX Sedan, 4 seater
Joined: 04-February 07

Posted 03 July 2006 - 02:20 PM

It's not the ft/min flow rate of the fan that matters, it is the flow/inch3.

Thus the 10" fans can have a flow rate 75%less and still pump as much air over a wider area.

Grant..

Back to top

#6 _devilsadvocate_

Guests

Posted 03 July 2006 - 07:24 PM

Grant, the ^ doesnt make any sense, to me anyway, perhaps it needs some clarification. If a fan manufacturer quotes the fan output in cubic feet/min at a given temp and pressure, isnt that the volume of air moved in a given time and a direct measure of performance of the fan, and that can be used in comparison to other fans irrespective of their diameter. Obviously if the fan can spread the flow over a bigger area of the radiator then more cooling will result, which well designed shrouds can achieve.

Edited by devilsadvocate, 03 July 2006 - 07:27 PM.

Back to top

#7 enderwigginau

Admin Wrangler

Moderators
2,000,527 posts

Name:Grant
Location:Brisneyland
Car:76 LX Sedan, 4 seater
Joined: 04-February 07

Posted 04 July 2006 - 01:21 PM

You've answered your own question.

Spread the flow over a greater area and more cooling will result.
We need to remember that the main aim is to use the radiator to remove heat from the coolant.
The greater AREA of significant airflow will reduce the tendency of hotspots and flow-around to occur.

And you are exactly correct that a good shroud is worth its weight in gold.

The flow-rate is only an expression of how much air that fan can push/pull. Cooling is a whole different science that this factors into.
You can compare 2 fans, eg. 10" and 16", but it will still come down to flowrate/area.

Grant..

Back to top

#8 _devilsadvocate_

Guests

Posted 04 July 2006 - 02:04 PM

We need to remember that the main aim is to use the radiator to remove heat from the coolant.

In case anyone had forgot?

Back to top

#9 limo

Lotsa Posts!

Members
2,672 posts

Location:Adelaide
Car:most Torana models, Jag, Vauxhall, Triton, Staesman
Joined: 24-May 06

Posted 04 July 2006 - 11:59 PM

you might want to check the current rating on your fans, I think the old bosch
altenators were only 35 amps,
at low revs maybe half

Back to top

#10 _@milco@_

Guests

Posted 05 July 2006 - 10:24 PM

i havew twin 10" thermos mounted in my lj, anf they fit perfectly, i mean perfect.......... ( in front of the radiator.)

Back to top

#11 shanegtr

Forum Fixture

Members
533 posts

Name:Shane
Location:Tom Price, Pilbara WA
Car:LJ 2 door
Joined: 10-November 05

View Garage

Posted 08 July 2006 - 06:40 PM

i havew twin 10" thermos mounted in my lj, anf they fit perfectly, i mean perfect.......... ( in front of the radiator.)

I've just been on the davis craig website and the 10" should leave around 10mm spare, mounted side by side in front of the radiator. Does that sound about right? And for the record, I just measured my old fan and its a 14" not 16" as I previously said. Milco do you have a pic of your setup that I could have a look at?