new MSD coil makes a loud humming noise

richie · 07-15-2001, 08:54 PM

Is this normal since it's a hotter coil?

elmir50 · 07-16-2001, 01:23 AM

Hi Richie,

The coil in your car is really just a small transformer. That noise your hearing is common to transformers, the proper name of it is Barkhorne if I remember correctly. Ever walk outside, especially at night you can hear the pole mounted electrical power transformers humming. Due to the cyclic magnetic forces and forces that exist between parallel conductors carrying current it is necessay to clamp laminations and impregenate the coils inside the ignition coil. Insufficient clamping usually results in hum. Another cause for hum in transformers which is most common is due to magnetostriction, which is the continued expansion and contraction of the transformmer steel due to the incresing and decresing flux in the core. This information just touches on why the hum is present, there still is more explantions that has to do with domiain boundaries and inpurities within the mtal of the transformer. If you don't understand anything about transformer then I can explain if you like.

dinomite · 07-16-2001, 07:29 AM

how loud is it? if its too lound and you don't like it, send the coil to msd and get a new one.

Mach 1 · 07-16-2001, 08:01 AM

This seems to be normal with this coil, I wouldnt worry about it, unless the noise bothers you.

Fast Freddy · 07-19-2001, 10:37 PM

I have this same problem also. I bought this cil after a friend di also. He was able t fix the hum in his car buy removing the stock plastic cover off the stock coil and istlling it on the MSD. I tried this withmine and it didn't help.

Just a thought.

Hope this helps!
Fred
http://fastfreddy.stangnet.com

------------------
87 LX50 Convertible - ProM conversion - Ported Cobra Intake - Ron Anderson TFS TW heads - TFS Track Heat Cam - 24lb injectors - Kenny Brown chassis kit - Motorsport Springs -Steeda 17x8.5 Wheels - Light bar - etc...
http://fastfreddy.stangnet.com

richie · 07-20-2001, 12:10 AM

The coil seems louder now.When I first installed the and drove the car it ran much stronger and revved quicker.I didn't drive the car the next two days because I was sick.Now the car runs not as well as it did the day I put the new coil in.I am wondering if the coil is difective.

t_oshea · 07-20-2001, 08:35 AM

I also have the MSD coil on my car and it makes the (loud but normal for the coil)transformer humming noise. I removed the plastic casing off the stock coil and used it on the MSD and it quieted it down a little bit. But, the noise doesn't really bother me much since the exhaust on the car is twenty times louder than the coil.

Mr 5 0 · 07-20-2001, 09:01 AM

richie:

Yes, as previously stated, the 'coil hum' you're hearing is fairly common with aftermarket coils, especially the MSD.

I have the Crane PS-91 coil and have never had any hum, but that could also just be good luck because in my experience, quality-control can be a little lax on some aftermarket parts, including coils.

07-15-2001, 08:54 PM	#1
richie Registered Member Join Date: Apr 2001 Posts: 47	new MSD coil makes a loud humming noise Is this normal since it's a hotter coil?

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07-16-2001, 01:23 AM	#2
elmir50 Registered Member Join Date: Mar 1999 Location: Tsawwassen BC Canada Posts: 413	Hi Richie, The coil in your car is really just a small transformer. That noise your hearing is common to transformers, the proper name of it is Barkhorne if I remember correctly. Ever walk outside, especially at night you can hear the pole mounted electrical power transformers humming. Due to the cyclic magnetic forces and forces that exist between parallel conductors carrying current it is necessay to clamp laminations and impregenate the coils inside the ignition coil. Insufficient clamping usually results in hum. Another cause for hum in transformers which is most common is due to magnetostriction, which is the continued expansion and contraction of the transformmer steel due to the incresing and decresing flux in the core. This information just touches on why the hum is present, there still is more explantions that has to do with domiain boundaries and inpurities within the mtal of the transformer. If you don't understand anything about transformer then I can explain if you like.

07-16-2001, 07:29 AM	#3
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	how loud is it? if its too lound and you don't like it, send the coil to msd and get a new one.

07-16-2001, 08:01 AM	#4
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	This seems to be normal with this coil, I wouldnt worry about it, unless the noise bothers you.

07-19-2001, 10:37 PM	#5
Fast Freddy Registered Member Join Date: May 1999 Location: Springfield, OH Posts: 61	I have this same problem also. I bought this cil after a friend di also. He was able t fix the hum in his car buy removing the stock plastic cover off the stock coil and istlling it on the MSD. I tried this withmine and it didn't help. Just a thought. Hope this helps! Fred http://fastfreddy.stangnet.com ------------------ 87 LX50 Convertible - ProM conversion - Ported Cobra Intake - Ron Anderson TFS TW heads - TFS Track Heat Cam - 24lb injectors - Kenny Brown chassis kit - Motorsport Springs -Steeda 17x8.5 Wheels - Light bar - etc... http://fastfreddy.stangnet.com

07-20-2001, 12:10 AM	#6
richie Registered Member Join Date: Apr 2001 Posts: 47	The coil seems louder now.When I first installed the and drove the car it ran much stronger and revved quicker.I didn't drive the car the next two days because I was sick.Now the car runs not as well as it did the day I put the new coil in.I am wondering if the coil is difective.

07-20-2001, 08:35 AM	#7
t_oshea Registered Member Join Date: May 2001 Location: Wilmington, DE Posts: 13	I also have the MSD coil on my car and it makes the (loud but normal for the coil)transformer humming noise. I removed the plastic casing off the stock coil and used it on the MSD and it quieted it down a little bit. But, the noise doesn't really bother me much since the exhaust on the car is twenty times louder than the coil.

07-20-2001, 09:01 AM	#8
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	richie: Yes, as previously stated, the 'coil hum' you're hearing is fairly common with aftermarket coils, especially the MSD. I have the Crane PS-91 coil and have never had any hum, but that could also just be good luck because in my experience, quality-control can be a little lax on some aftermarket parts, including coils.