Has anyone got any recomendations on the pro's and con's of removing the standard fan and shroud and replacing it with an electric one.

 

What size of fan and any preffered makes?

 

Cheers

 

Andy

no point in this imo. I have also heard of people having overheating problems while stationary when using electric fans.

I have removed my viscous fan and replaced it with one large electric unit from a Volvo something. No overheating whatsoever, in fact there is so much air going through the radiator, the air goes cold coming out. The fan draws a bit of current though, so much the headlights dim. A rewire will be needed soon.

Arnt the electric ones noisier too?

Not as noisey as the viscous one on full lock going down the road at 4000 rpm. That would be louder than most jet engines :)

maybe so but it will slow down very quickly once moving. Also if your engine is hot enough for the fan to be going full speed then revving it to 4k probably aint too wise.

Arnt the electric ones noisier too?

If removing the viscous fan and fitting an electric one, it only kicks in at a pre determined degrees as set by the user, usally around 85Deg, so is only on now and then.

smithy

I've got a 16" Kenlowe on mine set to come on at 85 degrees, i've had no problems at all.

 

Baz

I've had a 16 blade Pacett Fan with in line thermo switch. This increases your HP by about 10 bhp and used less fuel. I've had it for over 2 years and never a single problem. With regard to over heating, well that is utter rubbish. The modern electric fans are obviously superior to the viscus otherwise the motor industry (including Nissan) would have kept using then, which they haven't

maybe so but it will slow down very quickly once moving. Also if your engine is hot enough for the fan to be going full speed then revving it to 4k probably aint too wise.

 

New Zealand has good weather :)

nissan did keep using them, the 350z has one! Plenty of other cars still use them too, most mercs have them for example.

the viscous can flow 6000cfm and i aint been able to find a electric to match it so am staying viscous

the viscous can flow 6000cfm and i aint been able to find a electric to match it so am staying viscous

 

I suggest you check out the independant tests on the Pacet fan for yourself then. As the new bread of multi blade Electric fans are so much better than the viscus fan. It is a proven fact that it outperforms any other electric or Viscus fan presently Available.

 

When you stand infront of my car and the fan kicks in you can feel the wind as it sucks air through. It's like the same type of blast you get if you stick your head out the window at 50mph. Honestly there is no Viscus fan that shifts that kind of air volumes. Ask anyone whos got one or experienced being present during its operation. + All the top tuners world over use and promote their use for high performance engines. Ask yourself why.

 

I know that my car is in a higher state of tune and mechanical modification than most on this board and my viscus Fan couldn't deal with the heat transfer that the NA oil squirters transferes from the piston crowns to the oil and oil to water. If I was sat in heavy traffic I was having to overide my secondry aircon fan (An electic item) to assist the viscus keep on top of the temps. it wasn't a comfortable experience. The Pacet solved the problem to a degree I couldn't have believed had I not experienced. They are awesome.

 

It allows the car to reach normal operating temp quicker during winter. Which means your oil is working correctly, thus protecting Engine and Turbo Bearings.

 

It overruns when you switch engine off to prevent heat soak (very important for cars vith after market bigger turbos)

 

Don't just believe me check it out on other performance boards, look at rally car, race car and hill climbing race car setups.

 

Pacet or the 12 blade kenlows are the way to go with an aging car that suffers from problem caused by high enging running temps and heat soak.

I suggest you check out the independant tests on the Pacet fan for yourself then. As the new bread of multi blade Electric fans are so much better than the viscus fan. It is a proven fact that it outperforms any other electric or Viscus fan presently Available.

 

When you stand infront of my car and the fan kicks in you can feel the wind as it sucks air through. It's like the same type of blast you get if you stick your head out the window at 50mph. Honestly there is no Viscus fan that shifts that kind of air volumes. Ask anyone whos got one or experienced being present during its operation. + All the top tuners world over use and promote their use for high performance engines. Ask yourself why.

 

I know that my car is in a higher state of tune and mechanical modification than most on this board and my viscus Fan couldn't deal with the heat transfer that the NA oil squirters transferes from the piston crowns to the oil and oil to water. If I was sat in heavy traffic I was having to overide my secondry aircon fan (An electic item) to assist the viscus keep on top of the temps. it wasn't a comfortable experience. The Pacet solved the problem to a degree I couldn't have believed had I not experienced. They are awesome.

 

It allows the car to reach normal operating temp quicker during winter. Which means your oil is working correctly, thus protecting Engine and Turbo Bearings.

 

It overruns when you switch engine off to prevent heat soak (very important for cars vith after market bigger turbos)

 

Don't just believe me check it out on other performance boards, look at rally car, race car and hill climbing race car setups.

 

Pacet or the 12 blade kenlows are the way to go with an aging car that suffers from problem caused by high enging running temps and heat soak.

 

Cheers Mark,

 

It looks like you have done a lot of research and by the look of it are currently wearing the T shirt!!

 

Any idea on cost and where to buy for the best price?

 

Andy

Cheers Mark,

 

It looks like you have done a lot of research and by the look of it are currently wearing the T shirt!!

 

Any idea on cost and where to buy for the best price?

 

Andy

 

I have a friend who works at tweeks so I got mine there, I'd say it'll cost you about £1.30.

I suggest you check out the independant tests on the Pacet fan for yourself then. As the new bread of multi blade Electric fans are so much better than the viscus fan. It is a proven fact that it outperforms any other electric or Viscus fan presently Available.

 

When you stand infront of my car and the fan kicks in you can feel the wind as it sucks air through. It's like the same type of blast you get if you stick your head out the window at 50mph. Honestly there is no Viscus fan that shifts that kind of air volumes. Ask anyone whos got one or experienced being present during its operation. + All the top tuners world over use and promote their use for high performance engines. Ask yourself why.

 

I know that my car is in a higher state of tune and mechanical modification than most on this board and my viscus Fan couldn't deal with the heat transfer that the NA oil squirters transferes from the piston crowns to the oil and oil to water. If I was sat in heavy traffic I was having to overide my secondry aircon fan (An electic item) to assist the viscus keep on top of the temps. it wasn't a comfortable experience. The Pacet solved the problem to a degree I couldn't have believed had I not experienced. They are awesome.

 

It allows the car to reach normal operating temp quicker during winter. Which means your oil is working correctly, thus protecting Engine and Turbo Bearings.

 

It overruns when you switch engine off to prevent heat soak (very important for cars vith after market bigger turbos)

 

Don't just believe me check it out on other performance boards, look at rally car, race car and hill climbing race car setups.

 

Pacet or the 12 blade kenlows are the way to go with an aging car that suffers from problem caused by high enging running temps and heat soak.

 

1) Most 15yr old viscous clutches are now showing major signs of wear and aren't driving the fan fully, so maybe replacing the clutch would have solved your problem ;)

 

2) The thermostat is there to allow the engine to get up to temperature quicker by stopping the coolant flow to the rad so makes no difference ;)

 

3) The fan running on by itself will make no difference if the coolant is no longer being pumped round the block ;)

 

 

Now the ultimate solution would be to have the electric fan but with a few added extras. Remove thermostat and water pump impellor, then fit an electric water pump. This will only run under the conditions you specify, saving HP on driving the pump AND fan, plus giving the desired run-on protection....

I have a friend who works at tweeks so I got mine there, I'd say it'll cost you about £1.30.

 

WHAT??!!!!

1) Most 15yr old viscous clutches are now showing major signs of wear and aren't driving the fan fully, so maybe replacing the clutch would have solved your problem ;)

 

2) The thermostat is there to allow the engine to get up to temperature quicker by stopping the coolant flow to the rad so makes no difference ;)

 

3) The fan running on by itself will make no difference if the coolant is no longer being pumped round the block ;)

 

 

Now the ultimate solution would be to have the electric fan but with a few added extras. Remove thermostat and water pump impellor, then fit an electric water pump. This will only run under the conditions you specify, saving HP on driving the pump AND fan, plus giving the desired run-on protection....

 

Yep all the above is true However the Electric fan give better performance than the viscus (as mine was brand new and for sale if anyone wants one) and the heat sink protection given even without the electric pump, still prevents heat exchange from Turbos and manifolds to perishable such as hoses and wiring. + generally cools engine very quickly as opposed to it rising in temp for the first 30 minutes.

1) Most 15yr old viscous clutches are now showing major signs of wear and aren't driving the fan fully, so maybe replacing the clutch would have solved your problem ;)

 

2) The thermostat is there to allow the engine to get up to temperature quicker by stopping the coolant flow to the rad so makes no difference ;)

 

3) The fan running on by itself will make no difference if the coolant is no longer being pumped round the block ;)

 

 

Now the ultimate solution would be to have the electric fan but with a few added extras. Remove thermostat and water pump impellor, then fit an electric water pump. This will only run under the conditions you specify, saving HP on driving the pump AND fan, plus giving the desired run-on protection....

 

ok, so without going as far as an electric pump, will a turbo timer set at say 10 minutes add anything to the equation combined with an electric fan or does the car allready have electric fans anyway. Some one told me that they come with electric fans that come on if the temp is too high when you turn the ignition off.

 

Andy

Go and read what the people in the US say.

 

Electric fans are better, but on very hot days (Which we are getting more of) the electric fans can not push as much air as the stock viscus fan and so run hotter.

 

I remember reading on some US forums that they buy a Euro/Jap fan as a mod as it is larger than the US standard fan.

the viscous can flow 6000cfm and i aint been able to find a electric to match it so am staying viscous

 

18" Kenlowe mate... Works a treat and last summer, you know how hot the hotest days we're down here, Mineswas actually plumbed in the wrong way so it blew rather than sucked!!! No problems and now it's terminals are the right way around you can see the temp guage drop from half way down to a quarter of the way when it kicks in... Does the job!!!

the viscous can flow 6000cfm and i aint been able to find a electric to match it so am staying viscous

 

Yes but 6000cmf is the rating at what rpm?

 

Andy

in one way you will gain with an electric fan, but the the extra drain on the alternator will be the same, as andy has said, most of the viscous fans are getting on and not spinning aswell @ high load RPM or even in traffic, so a new one will benefit the v6, as we all know the engine bay gets hot with all that metal under there :wack:

 

ask people who have killed there heads from a failed viscous fan, legrath amongst other's so check your viscousity :smash:

in one way you will gain with an electric fan, but the the extra drain on the alternator will be the same, as andy has said, most of the viscous fans are getting on and not spinning aswell @ high load RPM or even in traffic, so a new one will benefit the v6, as we all know the engine bay gets hot with all that metal under there :wack:

 

ask people who have killed there heads from a failed viscous fan, legrath amongst other's so check your viscousity :smash:

 

How do Icheck it?

 

P.S thanks for the advise and no hard feelings about the rear light panel!

 

Andy

SRRAE

Electric fans are better, but on very hot days (Which we are getting more of) the electric fans can not push as much air as the stock viscus fan and so run hotter

 

You have the wrong electric fan then. Where I live we often get 35 degree days and I have no problems. Way better cooling than with the viscous unit as you get maximum cooling no matter what speed or engine RPM you are doing - 1 mph, still get maximum air flow. All the guys over here use the same fans for all the motor sport applications too.

 

 

Originally Posted by greg

in one way you will gain with an electric fan, but the the extra drain on the alternator will be the same, as andy has said, most of the viscous fans are getting on and not spinning aswell @ high load RPM or even in traffic, so a new one will benefit the v6, as we all know the engine bay gets hot with all that metal under there

 

Yes you do get an extra drain on your alternator but thats what it is for. In no way will the extra load create the same heat as what you are getting rid of, not even like 1%. As for "viscous fans not spinning as well", the viscous unit either works or it doesn't and if it doesn't it needs replacing. I've never heard of one working at 50% because if it does it's broken. They are simply not designed to "slip". Like markzx said, the advantages leaving the fan running a few minutes after the engine stops is huge. The amount of heat you can remove in that time has to be good for every thing under the bonnet.

How do Icheck it?

 

P.S thanks for the advise and no hard feelings about the rear light panel!

 

Andy

LOL @light panel, no problem anyway bud :cool:

 

you need to check from cold, there should be some resistance when trying to spin the blade on the viscous, if the fan spins freely with no drag, then its time for a new one like yesterday!

 

if theres resistance and it stops almost instantly then, it should be fine

 

you cannot test it with engine up to temp, or even cooling down it needs to be stone cold

 

also if it whines or sounds like a big jet taking off, it probably is on its way out aswell

 

there about £160 from nissan IIRC for just the viscous unit, fan blade is seperate and is around £60 the blades suffer from cracks, and it has been known to come away from the viscous, does cause alot of mess when spinning at 4k rpm :wack: , very rare though.

 

greg