Ally Radiators & Thermo Fans - Cooling System

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2nd February 2014, 07:14 AM
macca

Quote:

Originally Posted by NissanGQ4.2

Hence why most car manufactures have already moved over 2 electric fans *L*

These fans are probably like smart alternators. Helping with fuel efficiency figures. They wouldn't fit them if they didn't work. For us mud and water could be an issue.
2nd February 2014, 09:05 AM
Alitis007

Ally radiators are nice to look at but the cheap ones don't do their job very well, apart from not being serviceable they also creat excessive electrolysis in the cooling system where you need to do a bit of mucking around to extend the life of the cooling system components. I would recommend a brass copper 3 core radiator everyday of the week and so would my radiator bloke !

Thermo fans are tricky, as said before without a cowling they generally are useless only cooling a small portion of the core. Try stick to quality components Like the Davis Craig thermo fans which have great airflow capacities for eg the 16" flows 2200 cfm/min and the 12" 800 cfm/min or even the thermo from an FG Falcon which has a high and low and is rather large in diameter. The controller is where you would find most of your problems, the most common is the Davis Craig one the fits under the top radiator hose with an analog dial you set to your desired temp which tends to leak because of it design.
2nd February 2014, 10:01 AM
Dales300exc

Quote:

Originally Posted by NissanGQ4.2

Hence why most car manufactures have already moved over 2 electric fans *L*

Look at the heavy vehicle world. Only thermo in sight is on the a/c condensor.

Just checked out 200 series, they still run engine fan it would seem, there must be a reason they have not gone to thermos.

Thermos are probably also cheaper to manufacture.
2nd February 2014, 11:47 AM
nissannewby

Quote:

Originally Posted by Alitis007

Ally radiators are nice to look at but the cheap ones don't do their job very well, apart from not being serviceable they also creat excessive electrolysis in the cooling system where you need to do a bit of mucking around to extend the life of the cooling system components. I would recommend a brass copper 3 core radiator everyday of the week and so would my radiator bloke !

Thermo fans are tricky, as said before without a cowling they generally are useless only cooling a small portion of the core. Try stick to quality components Like the Davis Craig thermo fans which have great airflow capacities for eg the 16" flows 2200 cfm/min and the 12" 800 cfm/min or even the thermo from an FG Falcon which has a high and low and is rather large in diameter. The controller is where you would find most of your problems, the most common is the Davis Craig one the fits under the top radiator hose with an analog dial you set to your desired temp which tends to leak because of it design.

WhAt about the fAct that a lot of cars from the factory in the last 20 years come with aluminium core? I know my old 99 GQ has one from factory and it still had it in it when I sold it with now issues, not bad for 14years. My 04 GU also had one it from factory and with no issues after 10 years, the only thing being it was externally blocked a little. I still have it should any go wrong with my adrad unit as it works fine.
2nd February 2014, 11:51 AM
nissannewby

Quote:

Originally Posted by macca

These fans are probably like smart alternators. Helping with fuel efficiency figures. They wouldn't fit them if they didn't work. For us mud and water could be an issue.

This is pretty much why. Thermos are quiter and the only real time you need the fan is at very low speeds, as I said earlier once you are at speed then no fan can pull anywhere near as much air. So a lot go to thermos for fuel efficiency reasons, space and sound.
2nd February 2014, 12:34 PM
Alitis007

Quote:

Originally Posted by nissannewby

WhAt about the fAct that a lot of cars from the factory in the last 20 years come with aluminium core? I know my old 99 GQ has one from factory and it still had it in it when I sold it with now issues, not bad for 14years. My 04 GU also had one it from factory and with no issues after 10 years, the only thing being it was externally blocked a little. I still have it should any go wrong with my adrad unit as it works fine.

The fact of the matter is those radiators have plastic tanks, the combination of ally tanks with ally core is the problem. The difference in your situation is your motors had cast iron heads and not aluminium heads so the 33% ra rating of your coolant ( assuming its a concentrated mix of 980ml/l ethylene glycol for cast iron blocks ) may have had enough alkalinity to neutralize the electrolysis.
2nd February 2014, 01:16 PM
nissannewby

Quote:

Originally Posted by Alitis007

The fact of the matter is those radiators have plastic tanks, the combination of ally tanks with ally core is the problem. The difference in your situation is your motors had cast iron heads and not aluminium heads so the 33% ra rating of your coolant ( assuming its a concentrated mix of 980ml/l ethylene glycol for cast iron blocks ) may have had enough alkalinity to neutralize the electrolysis.

There is no problem. If done correctly there is still no
Issue. If people against using ally would throw more facts instead of scaring people then it wouldnt be so bad. 99% of the time the factory radiator is more than enough. I don't know why ally is so scary.

The full ally rad in mine now has no issues with electrolysis, I check it regularly running a 50/50 mix. How many diesel patrols have alloy heads?
2nd February 2014, 01:29 PM
NissanGQ4.2

2 Attachment(s)

Quote:

Originally Posted by Alitis007

The controller is where you would find most of your problems, the most common is the Davis Craig one the fits under the top radiator hose with an analog dial you set to your desired temp which tends to leak because of it design.

Would have to disagree George, sounds like some people are tight asses and not installing them correctly. I have what I believe 2 be what you refer to as an analog dial and they are NOT designed 2 be places under the house.

This is the correct fittings 2 be used with the controller which is also sold from Davis Craig

Attachment 40091 Attachment 40090

Quote:

Originally Posted by nissannewby

This is pretty much why. Thermos are quiter and the only real time you need the fan is at very low speeds, as I said earlier once you are at speed then no fan can pull anywhere near as much air. So a lot go to thermos for fuel efficiency reasons, space and sound.

Totally agree with your comment Matt

Quote:

Originally Posted by Dales300exc

Look at the heavy vehicle world. Only thermo in sight is on the a/c condensor.

Just checked out 200 series, they still run engine fan it would seem, there must be a reason they have not gone to thermos.

Thermos are probably also cheaper to manufacture.

Would not know if they are cheaper or not 2 manufacture, maybe they are just scared of change
2nd February 2014, 02:06 PM
Alitis007

1 Attachment(s)

Quote:

Originally Posted by nissannewby

There is no problem. If done correctly there is still no
Issue. If people against using ally would throw more facts instead of scaring people then it wouldnt be so bad. 99% of the time the factory radiator is more than enough. I don't know why ally is so scary.

The full ally rad in mine now has no issues with electrolysis, I check it regularly running a 50/50 mix. How many diesel patrols have alloy heads?

Heres a water pump from a vt commodore with a v6 Ecotec cast iron heads and factory ally rad Attachment 40092 need more proof ??
2nd February 2014, 02:09 PM
NissanGQ4.2

Quote:

Originally Posted by Alitis007

Heres a water pump from a vt commodore with a v6 Ecotec cast iron heads and factory ally rad, need more proof ??

I do

Couldn't that be caused by no coolant or incorrect coolant?

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