aftermarket electric cooling fans

[PC-85-928S]

Has anyone upgraded to aftermarket electric cooling fans?

Which system did you go with and why?

How was the installation?

Is the removal of the factory pulley fan always necessary?

I am considering on my 1985 928S 32v US, Auto

[Pete R]

I am using one from 928 specialist. It is great. I removed the factory electric fan and mechanical fan. It has a dual fan that comes on in stages of heat. The first one works so good I have never hit the second stage. It draws a bit more juice at start up, but less when running. It was a direct bolt in. Fit perfect. All the fit work has been taken car of. I installed it completely in about an hour, easy on the scale of 928 stuff. I'm pretty sure removal of the pulley fan is a must. You will have to figure out how to run your air pump. I removed mine. The ONLY drawback to this fan was it was expensive. Other than that.. great.

[Landseer]

I'm looking for the Taurus conversion parts for one car.

[MarkRobinson]

Jegs has a $89 16" reversible universal fan: I've installed on two of my buddy's cars: you'll need a relay, but otherwise...they're adequate, even in Texas

555-52110: search once on their site.

[neil30076]

I installed a Zirgo ZFU16S 3000CFM, 10Amp, (basically the same as the Jegs fan) in place of the old bosch fan on my 81 - needs a custom bracket to mount it correctly - if anyone is interested i can shoot some photos.

[Danglerb]

I like Motorcraft fans, none I know of are close to them in real cfm. The big air mover is the old Mark8 18" fan, over 4000 cfm and 35 amps, then the various Taurus and Tbird fans. Three good rules to keep in mind;

Efficiency is best with a larger diameter, smaller fans have lower efficiency.

CFM takes power, a 10 amp fan of the same size blows about 30% of the cfm of a 35 amp fan.

Start up current is about 3x running current, so use the right size wire, fuse, and relay. Make the best crimps you can.

*** Putting in an electric fan is a great way to force you to REALLY sort out your electrical system.

[Normy]

I'm working on a thread about this subject. I'm going to convert my '85 S2 and its 4.7 liter belt driven fan to dual electric fans.

I bought the S4 plastic frame with some aftermarket straight fans in February. I have a computer control to manage the fans, and a relay [with 30 amp wiring] to run the second fan. I have the Porsche frame, with cheap straight fans.

I'm working on the air conditioning on my 928, so I'm not sure I can get it installed this week. I have a shop that has worked on the car before, and they have fabricated a new high pressure hose. I was told today that THEY [Kel-tech in FLL] have worked on 928's before, and that this system is a simple Sanden, a Japanese system common on cars from the 1980's, and similar to VW and Audi's of the 1980's.

Well, I took my 928 to the shop today, and he told me that he couldn't fix it. It wont accept gas- He thinks it has a blockage somewhere. AC systems that have used the common leak sealers apparently often times create a blockage that winds up with you Pulled Over.

I hope you folks get your republicans worked out!

[neil30076]

Originally Posted by Danglerb

I like Motorcraft fans, none I know of are close to them in real cfm. The big air mover is the old Mark8 18" fan, over 4000 cfm and 35 amps, then the various Taurus and Tbird fans. Three good rules to keep in mind;

Efficiency is best with a larger diameter, smaller fans have lower efficiency.

CFM takes power, a 10 amp fan of the same size blows about 30% of the cfm of a 35 amp fan.

Start up current is about 3x running current, so use the right size wire, fuse, and relay. Make the best crimps you can.

*** Putting in an electric fan is a great way to force you to REALLY sort out your electrical system.

Sorry to disagree, but we have in the past :-)
I was referring to constant draw, not start up.
CFM is determined by speed, number of blades and blade pitch. Not current draw -
anyway - I do agree with you on wiring - I added a 6G wire (IIRC) directly from the hot post to relay, back to the fan, then used the original fan wiring to power the relay.

[Danglerb]

Originally Posted by neil30076

Sorry to disagree, but we have in the past :-)
I was referring to constant draw, not start up.
CFM is determined by speed, number of blades and blade pitch. Not current draw -
anyway - I do agree with you on wiring - I added a 6G wire (IIRC) directly from the hot post to relay, back to the fan, then used the original fan wiring to power the relay.

I was referring to the constant draw as well, the mark8 fan runs at 35 amps at full power, and about 105 amps from a dead stop.

The current x voltage = power that spins the fan, which moves the air. CFM = power x efficiency.

Speed, number of blades, and blade pitch are more factors related to operating conditions like static pressure and "intended" flow rates and effect the efficiency of a fan. Aftermarket fans tend to have lower efficiency than factory fans, especially modern factory fans, but the differences are small compared to the power differences.

[Sharkbit]

I used an electric fan kit I found on ebay for my '83. It comes with all the wiring/relay,insrtuctions, has a thermostat which allows you to determine when it comes on, low draw, and worked great in the heat of the south. Item # 160569322632, cost about 220.00. On the '85 you may have to leave the old fan bracket in place as the throttle cables are routed through a bracket which is attatched to it.

[Pete R]

Originally Posted by Normy

I'm working on a thread about this subject. I'm going to convert my '85 S2 and its 4.7 liter belt driven fan to dual electric fans.


I hope you folks get your republicans worked out!

I didn't notice that my fan had republicans, they must have been internal, it was an easy install and they weren't mentioned in the directions

[Normy]

Originally Posted by Pete R

I didn't notice that my fan had republicans, they must have been internal, it was an easy install and they weren't mentioned in the directions

Republicans just want to change every thing.


That is a talk for a different area; today, I spent $1014 to get my air conditioning working. I've been driving without it since last Halloween.

I normally drive with the windows down and the AC off, even in 90 degree Florida heat. I don't sweat, I'm 6'1" and 148 pounds. I run 6.2 miles per day when I'm home, in the heat, in the afternoon. Heat doesn't bother me! I had the AC totally re-done at the 26 year point because I cannot drive the car in rain. All the windows fog up, so I have to have AC, even if I really don't use it. Also, it is stupid to have a car of this value with an important system such as AC inoperative, not that I'm thinking of selling it or anything.

Well, I'm poor tonight. Next paycheck comes two weeks from now; Between now and then I'm going to eat a lot of cheap pasta!

N!

[stepson]

I used a single motor dual fan Audi set up on the '83 that I owned. It used a small belt to drive the second fan. It was powered from the hot post and used a relay powered from the ignition. Turn the key and it was on. It was very inexpensive and cooled the engine quite well.

[PC-85-928S]

I was looking at a system from this company.
v12s - Official Website
They were nice enough to send me the installation instructions.
They provide a shorter air pump belt in their kit.

[Danglerb]

Originally Posted by PC-85-928S

I was looking at a system from this company.
v12s - Official Website
They were nice enough to send me the installation instructions.
They provide a shorter air pump belt in their kit.

They used to spam Craigslist with ads, my hobby was flagging them. Not as overpriced as they used to be, but no indication of quality in the fans or motors used and no real technical information I could see on the site. I've never seriously considered their products for purchase, too many red flags to bother checking the possibility that they work, or work well.

Any fan should work "ok" with a good factory radiator under most conditions.

No fan is going to fix any real radiator issues.

[Landseer]

Refilling the viscous fan has worked for me on three cars. Makes electric a needless upgrade. Have decided to abandon Taurus fan project and find a viscous replacement for the car that came to me with the fan deleted.

[PC-85-928S]

what does that mean, "Refilling the viscous fan"
I am not familiar with that term

[MPDano]

Originally Posted by PC-85-928S

what does that mean, "Refilling the viscous fan"
I am not familiar with that term

There is a process in refilling the clutch fan with real thick oil. I used some RC Car Diff Lube and so far no overheating issues. Like Landseer, worked for me as well.

[153bigblock]

Originally Posted by MPDano

There is a process in refilling the clutch fan with real thick oil. I used some RC Car Diff Lube and so far no overheating issues. Like Landseer, worked for me as well.

Your local Toyota dealership will sell the stuff as well.

[maybach_man]

i got a new set of ford mondeo 2.6 fans for about £ 56.00. fits the radiator almost perfectly!!!

Geoff