might try a thinner radiator, maybe a 2 core alloy XY Falcon Rad.
thermo fans
Started by
_uglybob_
, Apr 01 2007 04:34 PM
31 replies to this topic
#26
_why-psi_
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Posted 04 April 2007 - 07:18 PM
thanks for all the feedback guys
might try a thinner radiator, maybe a 2 core alloy XY Falcon Rad.
might try a thinner radiator, maybe a 2 core alloy XY Falcon Rad.
#27
TerrA LX
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Posted 04 April 2007 - 07:20 PM
^^ or speed the pump up to compensate.
#28
_ChevLX_77_
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Posted 05 April 2007 - 10:12 AM
Here are the pictures i said i would take. Im not sure of the sizes but there not overly big. They keep my small block running cool all the time. The motor has never once got 85 degress even sitting still. These are davis craig ones.
With mechanical fans and you are using a fan shroud make sure you place the fan, i think its half in. so half the fan blade in shroud. if you put the whole fan in the shroud it can dam the air up. So the air is drawn but doesnt go anywhere and becomes hot therefore raising the tempeture around the raidiator. if your fan is too far out of the shroud the fan will not pull as much as air as it could. therefore becoming inefficent. Now thats just my understanding. i hope someone on the forum can shed more light on this subject and correct any of my infomation i have given.
With mechanical fans and you are using a fan shroud make sure you place the fan, i think its half in. so half the fan blade in shroud. if you put the whole fan in the shroud it can dam the air up. So the air is drawn but doesnt go anywhere and becomes hot therefore raising the tempeture around the raidiator. if your fan is too far out of the shroud the fan will not pull as much as air as it could. therefore becoming inefficent. Now thats just my understanding. i hope someone on the forum can shed more light on this subject and correct any of my infomation i have given.
#29
LS1LX
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Posted 07 April 2007 - 09:54 AM
Get rid of the stupid 5 row radiator, there isnt enough room there for a fan so heat is just building up. Once you get a large volume of water hot it takes even longer to cool it down then a smaller volume of water.
Put a 3 row in there and stick a mechanical driven fan on there or a largest thermo on the engine side.
Every time I see a "worked" car constantly running hot due to cooling system, they always seem to have a 4 or 5 row and a thermo on the front side.
I've never seen or had problems with a 3 row and an engine fan or large thermo on engine side.
Currently I run a large 2 row aluminium radiator with a single cheap ass 16" thermo, the thing runs at just over 1/2 temp even on 35 degree summers days here in sydney peak hour traffic and my engine bay is super tight with a lot of heat.
Put a 3 row in there and stick a mechanical driven fan on there or a largest thermo on the engine side.
Every time I see a "worked" car constantly running hot due to cooling system, they always seem to have a 4 or 5 row and a thermo on the front side.
I've never seen or had problems with a 3 row and an engine fan or large thermo on engine side.
Currently I run a large 2 row aluminium radiator with a single cheap ass 16" thermo, the thing runs at just over 1/2 temp even on 35 degree summers days here in sydney peak hour traffic and my engine bay is super tight with a lot of heat.
Edited by LS1LX, 07 April 2007 - 10:01 AM.
#30
_v8slrtorana_
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Posted 07 April 2007 - 10:48 PM
Stick the blade 75-80% inside the cowling/shroud for best effects.With mechanical fans and you are using a fan shroud make sure you place the fan, i think its half in. so half the fan blade in shroud. if you put the whole fan in the shroud it can dam the air up. So the air is drawn but doesnt go anywhere and becomes hot therefore raising the tempeture around the raidiator. if your fan is too far out of the shroud the fan will not pull as much as air as it could. therefore becoming inefficent. Now thats just my understanding. i hope someone on the forum can shed more light on this subject and correct any of my infomation i have given.
#31
_devilsadvocate_
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Posted 08 April 2007 - 12:31 AM
Steve, Im with ls2lxhatch here. If the tube size remains the same, adding another row of tubes makes it easier for water to be pumped through the radiator. Overall coolant flow can only increase when more tubes are put in parallel with the existing tubes. The amount of extra flow depending on the "resistance" of the radiator in comparison to the total resistive path through the engine and the design of the pump. Would anticipate that the extra flow in sizes bigger than a 3 core would be marginal with a standard pump, ie the flow in a v8 3 core would be the same as a 5 core. This would mean that the water wouldnt be flowing through the tubes as fast in a 5 core. Some theories point to that the water must travel at a minimum speed to create the necessary conditions to make good contact with the tube .........perhaps this may be a reason as to avoiding the larger core rads.........sceptical of this myself.....or perhaps its just the poor explanations of how it occurs.The reason I am not keen to replace my 2 core with a 3 core is if i do that i think my coolant flow rate will drop and the air flow through the radiator will be reduced (due to the extra row of tubes), possibly resulting in either a very minimal increase in cooling, no change or a reduction in cooling (read car overheats worse).
Steve
Agree with the theory/observation that larger 4 and 5 cores should use mechanical fans. Dont agree that you would suffer from the same phenomenon in going from a 2 to 3 core, Ive never heard of any report of a 6cyl 2core standard copper/brass radiator working better than the 3core in any application, most jump for joy on how much better the 3core works.
ChevLX_77: Those DC fan motors are actually quite powerful(no longer available) and were also fitted with 12in blades. Possibly the 10in blades you have are designed to move just as much air. These fans were fitted on some of the 70's Holdens as auxilary fans for the aircon and a9x(I think). I had them fitted as you do on the engine side of the rad, unfortunately I would only get about 5000km use out of them in summer(possibly only 4 or 5hours of use) before the bearings would fail(will start to squeal), the bearings can be replaced but do fail again. They can fail catastrophically and seize, then the motor will burn out......throw away......could leave you stranded in traffic. The motor isnt really suited to long term use behind the radiator where its going to be operating at 80C+. I now only use one mounted in front of the radiator/condensor and it has not experienced the same bearing failure after 50000km.Here are the pictures i said i would take. Im not sure of the sizes but there not overly big. They keep my small block running cool all the time. The motor has never once got 85 degress even sitting still. These are davis craig ones
#32
_1uzbt1_
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Posted 09 April 2007 - 02:38 PM
restrictive flow through a radiator?Pfffft!!!The smallest restriction you will have is the thermostat/maybe top fitting on a 6cyl,may be a little turbulance as the flow comes through the tube to the tanks,but thats it.
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