Engine How many amps does a Mercury Villager fan pull?

boostfrk

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Dec 27, 2012

#1

• Dec 27, 2012

• #1

I picked up one of these in the JY a few months back and am hoping to install after the New Year.

Anyone know how many amps these pull on the high speed? I'm planning to pick up a Flex-a-lite VSC from Summit but want to make sure I get one that can handle the fan.

 

gearheadboy

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Dec 27, 2012

#2

• Dec 27, 2012

• #2

Wire it up to a battery and put a properly fused meter in line and find out. That's the best way.

 

boostfrk

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Dec 28, 2012

#3

• Dec 28, 2012

• #3

gearheadboy said:

Wire it up to a battery and put a properly fused meter in line and find out. That's the best way.

Click to expand...

This is my 'Plan B', but was hoping someone out there had the knowledge.

 

HISSIN50

"How long does it take to get help in here?

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Dec 29, 2012

#4

• Dec 29, 2012

• #4

Unless you're holding out on us, you'll probably need a shunt

 

gearheadboy

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#5

• Dec 29, 2012

• #5

HISSIN50 said:

Unless you're holding out on us, you'll probably need a shunt

Click to expand...

Shunt is that like a penny behind the fuse?

 

HISSIN50

"How long does it take to get help in here?

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#6

• Dec 29, 2012

• #6

Most DIYers don't have an ammeter able to accurately measure current in the 100 amp range.

 

boostfrk

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Dec 29, 2012

#7

• Dec 29, 2012

• #7

HISSIN50 said:

Most DIYers don't have an ammeter able to accurately measure current in the 100 amp range.

Click to expand...

Raises hand. This is me. Plan 'B' not only involves measuring it with an ammeter but also involves purchasing an ammeter.

 

Boydster

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Jan 8, 2013

#8

• Jan 8, 2013

• #8

You could measure the ohms of the fan motor, divide by 14.5 (max volts) and that will get you close for running amps.

14.5 volts divided by, say, .145 ohms = 100 amps.
.100 ohms = 145 amps.
.253 ohms = 57.31 amps.

 

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MikeH686

Mine is only two inches though.

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Jan 8, 2013

#9

• Jan 8, 2013

• #9

Good reference of ohms law

 

boostfrk

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Jan 8, 2013

#10

• Jan 8, 2013

• #10

Boydster said:

You could measure the ohms of the fan motor, divide by 14.5 (max volts) and that will get you close for running amps.

14.5 volts divided by, say, .145 ohms = 100 amps.
.100 ohms = 145 amps.
.253 ohms = 57.31 amps.

Click to expand...

Now you're thinking.! Thanks.

 

7991LXnSHO

wanna catch the space herp

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Jan 15, 2013

#11

• Jan 15, 2013

• #11

The impedence may not be the same as the resistance. But it is a good place to start. The newest Street Rodder magazine had an electronics article. The article's guide is 1 amp per inch of fan with 2 TIMES THE amps for start up. Add a little extra for safety in your relay. (edited for stupid phhone errors!)

 

gearheadboy

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#12

• Jan 15, 2013

• #12

Thats pretty close to what I've heard they pull. Does that count the spike when it first powers up?

 

7991LXnSHO

wanna catch the space herp

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Jan 16, 2013

#13

• Jan 16, 2013

• #13

I'll let you read and decide the author's intent - I think yes, the article does cover your spike with 2x the amps.
Pg 92, top of second column of the March 2013 Street Rodder magazine. (It has a red '32 with a supercharged W motor on the cover)
" ELECTRIC FANS
On average, an electric fan will require 1 amp per inch of overall diameter to operate at normal speed. For instance a 12-inch fan will require 12 amps to operate but also note that twice the amperage is required duing initial start up. Be sure the circuit protection can handle the start-up load as well as the fan relay."

 

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