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

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".

 

what you have written there is pure bullshit, slipping is EXACTLY the purpose of the viscous clutch unit.

What I mean is that it doesn't drive the fan (slips 100%) or it does drive the fan (slips 0%).

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.

 

I can tell you from experience that I intalled my Pacet halfway through the hotest part of the previous summer and like I said the electric fan way way better and pushes much more air that the Viscus I removed.

 

Search the web for pacet fans and you'll find the independant tests as I did before I installed. Even though Dave Perry of dpmotorsport (who has a global reputation for producing fast Porsches and possibly the fastest ever Pulsar on the plannet and has been a top tuner for years) told me to go that way, I still did my research and I advise everyone to do the same. Not just listen to what people here tell you.

 

You'll find that the new generation 12 and 16 blade fans literally blow everything else away.

What I mean is that it doesn't drive the fan (slips 100%) or it does drive the fan (slips 0%).

 

Sorry but you are wrong. The viscous clutch works on the principle of viscosity - therefore it requires a liquid inside which changes viscosity with temperature. As the clutch wears, the seals wear and the fluid inside leaks out. Depending on the amount of fluid remaining, you get a varying amount of 'drive' to the fan, eventually giving virtually no drive at all when the fluid is gone....

Hi Andy

 

Like I keep saying best doing a few searches and make your own mind up.

 

I think what many are saying here is true for the old fashioned kenlow type fans, but the modern Fans and especially the race developed replacement fans like the Pacet are truely awesome.

 

I used to have a kenlow on my Range Rover about 8 years back. It did its job but it was feeble. The Pacet fans would suck your hand through the rad it you were daft enough to try it and a Viscus wouldn't even pull your hand close enough to the rad to mark it.

 

nzniggles

 

I've said enough I'm only trying to help but some people want to stick to tried and tested.

 

P.S

 

For all you Viscus Fan fans I have 2 for sale. My original which I removed thinking it must be knackered (cos car was getting too hot and needed the auxiary fan hot wiring to help) and the Brand new OEM one I replaced it. Only to discover that it was just the same.

 

Before anyone suggests it might have been a rad problem I suggest they read my specs.

Read what with your specs Mark? Didn't even know you wore them :rofl: ;)

 

I'm not saying electric fans are no good - just that they are not 100% necessary for everyone... I've seen a lot of knackered viscous clutches before, you can tell straight away when you start the engine from cold.

 

There are some excellent electric fan setups out there - I was looking into buying the combined rad/fan/shroud setup from Ash in the states. Proper double pass rad design with fan and shroud for a very reasonable price! http://www.ashspecz.com/gallery/development/development.htm Not sure on progress with this at the moment though....

 

Combine an electric fan with an electric water pump and you're getting towards the setup I'll be running once its all back together ;)

One of the mustang shroud kits fits the 300 nicely can't remember what year though :smash:

There are some excellent electric fan setups out there - I was looking into buying the combined rad/fan/shroud setup from Ash in the states. Proper double pass rad design with fan and shroud for a very reasonable price! http://www.ashspecz.com/gallery/development/development.htm

 

Im 100% up for that group buy... Or can anyone recommend a fan that would suit a Koyo? Does anyone sell mounting brackets/shrouds (like Ash) for the ZX?

Im 100% up for that group buy... Or can anyone recommend a fan that would suit a Koyo? Does anyone sell mounting brackets/shrouds (like Ash) for the ZX?

 

Want me to get in touch about a possible UK group buy then? Been in touch with Ash quite a bit so don't mind doing the ground work on this one. The GB on his site was for April this year so won't be appropriate but I'm sure he'll do another if we can get the numbers up??? Show initial interest on this thread then if there's enough I'll start a fresh one :)

 

Cheers,

 

Andy

what control set up are you running mark , do pacet or kenlowe do a all in one kit with relay , switch and temp controler?

Whats the bimetallic coil spring thingy in the viscous fan for? I thought that was to lock it up when it got hot? And the viscous was to let it slip after a certain amount of rpm the rest of the time

It appears I may have been a bit wrong :slap:

 

Seems there are two types of viscous coupling and the 300 uses the heat sensing type (with the bimetalic strip) and this unit does allow for partial drive (ie slip). I had been reading the information on the other system.

 

In another article though, this guy sums it up ....

 

Now, the big problem with any engine-driven fan is that it runs slow when you need it to run fast, and runs fast when you don't need it at all.

 

Specifically, at idle, with the car stopped, there is no relative wind created by the car's movement, and the fan's only ticking over, so it doesn't pull much air.

 

On the other hand, when you are ripping down the road with the relative wind hustling through the grille at, oh, 54.9 MPH, the fan isn't doing anything much, no matter what the clutch does.

 

The first condition (low flow at idle) is the reason so many car have helper fans that boost the flow over the A/C condensor, and the second condition is why fans that can be shut completely off are more efficient.

 

BMW once tried to combine all this into one unit; my 1972 Bavaria had a temperature-sensing _friction_ fan clutch. Imagine the perverted result of the union of a drum brake and a coolant thermostat and you will have it. In theory, it would be either fully engaged (when hot) or fully released (when not.) In reality, they wore out anually, since the thermostatic element couldn't "snap" quickly enough, and they spent too much time in a half-engaged condition.

Want me to get in touch about a possible UK group buy then? Been in touch with Ash quite a bit so don't mind doing the ground work on this one. The GB on his site was for April this year so won't be appropriate but I'm sure he'll do another if we can get the numbers up??? Show initial interest on this thread then if there's enough I'll start a fresh one :)

 

Cheers,

 

Andy

 

Yeah get some prices Bud.

 

Andy

what control set up are you running mark , do pacet or kenlowe do a all in one kit with relay , switch and temp controler?

 

Yes both Kenlow and Pacet do a complete kit with special rad mounts and a thermo switch. The Problem with the Switch that comes in the kit is that it uses a standard Thermo Coupling. Just the same as you'd find in a boiler.

 

It has a long copper wire with a probe on the end which you have to incert into the top water pipe. The other end is attached to something that looks like its been nicked of a old cooker. Messy and cluttered.

 

Your better to get the fan and fixing kit and then buy one of the inline thermo switch systems, either a preset probe switch which is fitted into the top of water pipe either by tapping it or with an addaptor. I went for the most expensive version, but it looks neat and doesn't obstruct the flow at all.

It uses the wall of the adaptor pipe to convect the heat to a sensor switch mounted in a alloy box witch is part of the adaptor. At £40 its twice the price of the other alternatives but it really does look tidy.

 

First three are of newer tidy type and last one of the original Cooker switch type, which I still have if anyone wants it. It'll cost you the postage.

Damn fine engine you got there Mark!

 

Muchos respectos :bow:

Damn fine engine you got there Mark!

 

Muchos respectos :bow:

 

It didn't come cheap nor without costly misyakes, but it's getting close to what I want now. Got a new twin MAF/Power Enterprize induction system to go on and now I've had 7000 trouble free running in. Then its 740 injectors and if things go to plan next year a I'll be the only person in the UK with a Evolution Explosion wide arch kit but not the spazzy front ot rear bumper.

yeah, Mr Duff would be interested, depending on cost..

 

Thanks

Want me to get in touch about a possible UK group buy then? Been in touch with Ash quite a bit so don't mind doing the ground work on this one. The GB on his site was for April this year so won't be appropriate but I'm sure he'll do another if we can get the numbers up??? Show initial interest on this thread then if there's enough I'll start a fresh one :)

 

Cheers,

 

Andy

 

Did anything come of this? Still interested! $520 on their site from last year, maybe less now.

Up at Lukes (zcentre) last week and I think he now has an electric fan kit ready to go to replace using the Viscous.

Smithy

Nice looking set up. Good shroud, it's what a lot of electric fan installs are missing.

Nice looking set up. Good shroud, it's what a lot of electric fan installs are missing.

 

Andy please sort out a group buy on these! Preferably $500 delivered! ;)

Ok will get on the case ;)

Ok will get on the case ;)

 

Let me know if you need a hand with anything.

hey andy!

im defo up for a group by too!

depending on how long its likely to take?

i currently have all air-con inc fan and viscous stripped out and im looking for a fan and rad so would be ideal!!!!

I'm also looking into doing this but already have a rad, but you might like to know Spal makes a 16" which flows 3000cfm slightly more than Pacet and kenlows