Push or pull - does it matter?
Discussion
Alexdaredevilz said:
The fact the fans will be fighting the air as you drive?
Why will they?You get fans that pull air the opposite direction to allow for the front mounting rather than the rear mounting location so they still pass air the same direction through the rad and mine have no shrouds / cowlings so there *SHOULD* be no loss of airflow...
Phil
Russell Mc said:
It's more efficient for the fans to pull through the rad rather than push through
...and...Mark_S_24 said:
If you put the Fan infront of the radiator to drag it through, I would have thought it would disturb the airflow, don't think I've ever seen any manufacturer put it infront of the raditor.
So I would assume putting it to the rear to pull it through is more efficient.
I can understand that it is more efficient if you have the cowling round the fans as I've seen in some cars but mine aren't cowled - they're just bolted to plates that attach to the top and bottom of the radiator and are just held snug against the radiator core.So I would assume putting it to the rear to pull it through is more efficient.
I think it's gotta be worh a Google - they're 12" Spal's aren't they?
Phil
Ribol said:
Why would you want the motors, blades and mountings getting in the way of the air hitting the rad core, somewhat defeating the object of the airflow?
Maybe, but that's what TVR did with the S Series cars (S1 may have been behind rad?)Behind the rad they will still restrict air flow, what comes in has got to get out
Ignore the damage............
Pull fans are more efficient, even moreso with a cowling, push fans less efficient, but if like me you don't have the room to have twin fans and a cowling behind the rad then a large fan in front and a standard size one behind using a push pull arrangement is the way forward,
Fans don't really do anything above 30 mph it's only when slow moving or stationary
Fans don't really do anything above 30 mph it's only when slow moving or stationary
Ribol said:
Why would you want the motors, blades and mountings getting in the way of the air hitting the rad core, somewhat defeating the object of the airflow?
Hence why most cars that have them in front of the rad use dual fans i.e Citroen/Peugeot even the non AC models so what does this tell you when everything else uses 1 for non AC and behind rad they are not going to fit an extra fan unless they thought it necessary 
behind the rad gets my vote 
in front the blades will just deflect the incoming air into the nose sides/corners rather than straight through the matrix/core 
Edited by Simon says on Tuesday 21st August 23:05
I had serious cooling problems on kit car with a high capacity fan on the front of the radiator. Eventually I spoke to an fan expert , Alan Fereday at Fereday Cars, who told me that it is always better to fit a fan behind the radiator. This because the fan in front of the radiator will only ever allow the rated flow rate of the fan through the radiator. To prove it he suggested I take the fan off the car and drive it. I was amazed as this was the first time the car ran under 90 degrees C.
I ended up fitting a new fan on the back of the radiator that was rated at only 2/3 of the original fans flow rate and never had a problem with overheating again.
I ended up fitting a new fan on the back of the radiator that was rated at only 2/3 of the original fans flow rate and never had a problem with overheating again.
charlie vrs said:
I had serious cooling problems on kit car with a high capacity fan on the front of the radiator. Eventually I spoke to an fan expert , Alan Fereday at Fereday Cars, who told me that it is always better to fit a fan behind the radiator. This because the fan in front of the radiator will only ever allow the rated flow rate of the fan through the radiator. To prove it he suggested I take the fan off the car and drive it. I was amazed as this was the first time the car ran under 90 degrees C.
I ended up fitting a new fan on the back of the radiator that was rated at only 2/3 of the original fans flow rate and never had a problem with overheating again.
Fair enough - there's some real-world experience ...I ended up fitting a new fan on the back of the radiator that was rated at only 2/3 of the original fans flow rate and never had a problem with overheating again.
...pull it stays then.
Phil
Gassing Station | Chimaera | Top of Page | What's New | My Stuff