Mark V111 97-98
Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
Variable spreed is how you avoid the high amperage inrush. Those Mark 8 fans have well over 100 amperes inrush. Same with crown Vic’s/town cars. Even though they may run at 20 amperes.
Variable speed or a soft start controller is really required. But finding one that will handle the inrush? Maybe those listed?
I went with a Flex a light controller that has a soft start, but at the time, the max fuse they offered was only 45 amp. I put in a 2001-2004 Mustang fan. It had an inrush of 60 amperes I believe and ran at 16 Amps. I tested what fuses would hold up and the 45 amp fuse was fine.
I also built a jig to test used fans and their output. I can tell you, people are misinformed on what fans put out how many CFM’s. I went back and forth with Dorman Tech on the specs for different fans, then tested them and some OE’s. Most didn’t even come close to the max specs.
Different forum...
https://www.explorerforum.com/forums...c-fans.417907/
Variable speed or a soft start controller is really required. But finding one that will handle the inrush? Maybe those listed?
I went with a Flex a light controller that has a soft start, but at the time, the max fuse they offered was only 45 amp. I put in a 2001-2004 Mustang fan. It had an inrush of 60 amperes I believe and ran at 16 Amps. I tested what fuses would hold up and the 45 amp fuse was fine.
I also built a jig to test used fans and their output. I can tell you, people are misinformed on what fans put out how many CFM’s. I went back and forth with Dorman Tech on the specs for different fans, then tested them and some OE’s. Most didn’t even come close to the max specs.
Different forum...
https://www.explorerforum.com/forums...c-fans.417907/
Thread Starter
|
Cargo Master
Joined: Nov 2010
Posts: 3,172
Likes: 101
From: darlington
Lincoln continental last year was 92,,,it came out of a Lincoln 97 Mark V111,seimen motor # different than fan shroud # says Ford made in Canada,,car was pretty complete that's all I know,blows a lot of air strong
Lead Driver
Joined: Mar 2008
Posts: 7,182
Likes: 380
From: Near Los Angeles
Variable spreed is how you avoid the high amperage inrush. Those Mark 8 fans have well over 100 amperes inrush. Same with crown Vic’s/town cars. Even though they may run at 20 amperes.
Variable speed or a soft start controller is really required. But finding one that will handle the inrush? Maybe those listed?
I went with a Flex a light controller that has a soft start, but at the time, the max fuse they offered was only 45 amp. I put in a 2001-2004 Mustang fan. It had an inrush of 60 amperes I believe and ran at 16 Amps. I tested what fuses would hold up and the 45 amp fuse was fine.
I also built a jig to test used fans and their output. I can tell you, people are misinformed on what fans put out how many CFM’s. I went back and forth with Dorman Tech on the specs for different fans, then tested them and some OE’s. Most didn’t even come close to the max specs.
Different forum.../
Variable speed or a soft start controller is really required. But finding one that will handle the inrush? Maybe those listed?
I went with a Flex a light controller that has a soft start, but at the time, the max fuse they offered was only 45 amp. I put in a 2001-2004 Mustang fan. It had an inrush of 60 amperes I believe and ran at 16 Amps. I tested what fuses would hold up and the 45 amp fuse was fine.
I also built a jig to test used fans and their output. I can tell you, people are misinformed on what fans put out how many CFM’s. I went back and forth with Dorman Tech on the specs for different fans, then tested them and some OE’s. Most didn’t even come close to the max specs.
Different forum.../
Our testing showed the Mark VIII fan ran 26-28 amps on low, with a 37-40 amp startup spike. On high it had a draw of about 32-35 amps with a 48-53 amp startup spike.
The Taurus fan ran 24-26 amps on low, with a 32 amp startup spike
Then on high it used about 28-29 amps with a 40-45 amp startup spike.
I would also add that MANY people use these fans without PWM (pulse width modulation, or soft start controllers) without issue. I am one of them. A popular and very inexpensive control is the Volvo relay pack that starts your two speed fan in low, shuts off the low when/if the temp rises, and turns on the high speed. These can be had for $15-$20 in a j/y, or $55 new!!
**Keep in mind that the amps mentioned above are for a true MK8 fan. 90% of the people who call their fan an MK8 fan don't have a true one, but rather a Sable, Cougar, Taurus, Continental (not MK8), or Mustang fan with the wide blades but smaller motors than the mk8. Cheers.
Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
SEVERAL THINGS YOU WRITE ARE SIMPLY NOT THE TRUTH BUT RATHER INTERNET MYTH. From a stop to high speed jump, the MK8 only spikes from 48-53 amps. The following info I took from a reputable site:
Our testing showed the Mark VIII fan ran 26-28 amps on low, with a 37-40 amp startup spike. On high it had a draw of about 32-35 amps with a 48-53 amp startup spike.
The Taurus fan ran 24-26 amps on low, with a 32 amp startup spike
Then on high it used about 28-29 amps with a 40-45 amp startup spike.
I would also add that MANY people use these fans without PWM (pulse width modulation, or soft start controllers) without issue. I am one of them. A popular and very inexpensive control is the Volvo relay pack that starts your two speed fan in low, shuts off the low when/if the temp rises, and turns on the high speed. These can be had for $15-$20 in a j/y, or $55 new!!
**Keep in mind that the amps mentioned above are for a true MK8 fan. 90% of the people who call their fan an MK8 fan don't have a true one, but rather a Sable, Cougar, Taurus, Continental (not MK8), or Mustang fan with the wide blades but smaller motors than the mk8. Cheers.
Our testing showed the Mark VIII fan ran 26-28 amps on low, with a 37-40 amp startup spike. On high it had a draw of about 32-35 amps with a 48-53 amp startup spike.
The Taurus fan ran 24-26 amps on low, with a 32 amp startup spike
Then on high it used about 28-29 amps with a 40-45 amp startup spike.
I would also add that MANY people use these fans without PWM (pulse width modulation, or soft start controllers) without issue. I am one of them. A popular and very inexpensive control is the Volvo relay pack that starts your two speed fan in low, shuts off the low when/if the temp rises, and turns on the high speed. These can be had for $15-$20 in a j/y, or $55 new!!
**Keep in mind that the amps mentioned above are for a true MK8 fan. 90% of the people who call their fan an MK8 fan don't have a true one, but rather a Sable, Cougar, Taurus, Continental (not MK8), or Mustang fan with the wide blades but smaller motors than the mk8. Cheers.
The bigger a DC motor is, the greater it’s inrush would be. There is no way a Mark VIII fan has an inrush of only 48-53 amperes at startup. The ones I’ve personally tested maxed out my 100 amp gauge.
Running the Mark VIII and similar fans without an inrush limiter (or slow start) will put excessive wear on the relay contacts.
I believe the Volvo relays both run when max temp is reached, I’ve seen nothing that shows the first relay being disconnected.
Senior User
Joined: Apr 2013
Posts: 105
Likes: 2
From: NorCal
Dave is this thing installed wired and running? The more I read about these the more problems I see. Gonna go check Steve's post now too find out how he handled the control power to fan control board...
Senior User
Joined: Jun 2014
Posts: 244
Likes: 3
Yup for two years now without a hiccup. The model I bought will take up to 125 amps so it’s well with spec to handle a single automotive electric fan. I dig it but don’t begrudge anyone doing a non variable fan setup. One of the cool things about this forum is seeing all the ways people work on their rigs, both the simarities and differences. If I was running a cheapie PWM controller though I’d probably use a solid state relay to be safe.
Thread
Thread Starter
Forum
Replies
Last Post
