radiator fan?

[scruff123]

can anyone tell me how much cfm of air a standard viscious fan at 3000rpm moves in a 4jg2 motor? cheers

[geeves]

not sure its ever been measured or has a design spec but its lots

[DeeSix]

http://www.1728.com/flowrate.htm

This may help.

[DeeSix]

http://www.1728.com/flowrate.htm

This may help.

[scruff123]

cheers, would a steel or alloy fan pull forward at all and hit the radiator wen going through water?

[geeves]

Plastic one does It them crimps tubes in the radiator and breaks blades off.(currently on third fan) Metal would do the same thing and probably cut holes in the tubes.
The viscous fan is meant to stop in water but it doesnt. Electric fans are the only answer but you either need a water activated switch to turn it off (can be manual) or mount the fan in front of the radiator so the blades pull away from the radiator

[scruff123]

all the elictric fans ive used havnt been able to keep up with the cooling requirments at low speed 4x4ing and on the beach etc, though of using a v8 holden electric fan set up with shroud but room is minumil. got any suggestions?

ive got a custom radiator wich is slitly bigger than standard in capacity

P1042392.JPG

P1042391.JPG

also can anyone tell me wich sensor is the one for the temp gauge?

thanks

[jezza]

have you tried using a shroud that covers the whole surface area of the core with those fans? Because there looks to be a large amount of core that has no cooling

[geeves]

For a cowling to work the fans would need to be further back which looks to be a bit tricky

[scruff123]

ive got 100mm max from back of rad

[turnturn]

Scruff123 there is some discussion about temperature senders in this topic viewtopic.php?f=24&t=521&start=0

[wbski007]

the radiator is awsome and the fans are too, scruff, looks like you have plenty of cooling just the way it is

[scruff123]

the fans dont cool it enough, she heats up goin up an average sized hill and when 4x4ing, unless its something else but everythin seem to be fine

[geeves]

Above about 50 kph the airflow should be enough on its own to keep the engine cool. If not then something is either resticting the airflow or the airflow is getting round the radiator, or the waterpump fins have rusted off or the engine is making too much heat

[scruff123]

Above about 50 kph the airflow should be enough on its own to keep the engine cool. If not then something is either resticting the airflow or the airflow is getting round the radiator, or the waterpump fins have rusted off or the engine is making too much heat

i think ill have to re posision radiator lower and make up somthing wit some sheet metal so air isnt going aroung it. water pump is brand new. what could be cuasing the engine to be making to much heat?\

P1042389.JPG

[wbski007]

Timing might be a little off, that would cause more heat, the radiator and fans you have now should be doing the trick for you,I have just a stock 12 year old rad and 1 electric fan and I pull hills with my camper and never even get close to getting hot. I'd say you have somthing else going on there scruff.

[scruff123]

yea been thinking along those lines, on my old radiator i had a 16inch fan pulling and two 12s pushing and still used to get hot. temp gets just a bit higher than this

P1122447.JPG

[wbski007]

I wouldn't go by the stock guage scruff, they sometimes are not accurate, get yourself a good machanical temp guage, before you go any further. with that rad and those fans you should be able to cool two motors, great job on mounting the rad and oil cooler, looks professonial.

[scruff123]

ive got a new electrical one with new sender to put in, are the mechanical ones better? yea its for a nissan s13 silvia and ment to support up to 800hp. cheers ive got photos of the whole process if u want ill put them up in my rig forum

[geeves]

A rough and ready test of temp is to put your hand on the top of the radiator. It should be about 10C less than the engine so if the engine is running at 90C the rad will be around 80 and you should be able to touch it but not hold your hand on it for more than a few seconds. If it takes the skin off on first touch its hotter than that.
Also under normal operating conditions it should not boil with the cap off. DONT REMOVE CAP WHILE ENGINE RUNNING. Remove cap from cold engine You can leave it on one click. If it doesnt boil on a trip it never reached 100C so you have a gauge fault