Another coil post

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2017: Another coil post
Top of pagePrevious messageNext messageBottom of page Link to this message  By tommy coffey on Tuesday, October 24, 2017 - 01:45 pm:

Please forgive me but I thought it interesting... Today I opened up three coils to replace the capacitors and two of them had capacitors that were about the size and shape of a AAA battery. All I had seen were the oval shaped rolled up foil.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jim Eviston on Tuesday, October 24, 2017 - 01:57 pm:

Someone has been their before you.
Unless they are the light weight wood JC Whitney coils marked KW with rough unstained wood.
Don't know what is in those.
But they usually had good points to rob off 'em.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Hal Davis-SE Georgia on Tuesday, October 24, 2017 - 03:53 pm:

I'm guessing they had cores made of stacks of flat sheet metal rather than a bundle of round iron wires?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Charlie B actually in Toms River N.J. on Tuesday, October 24, 2017 - 05:20 pm:

New one on me. After after market as Jim suggests?


Top of pagePrevious messageNext messageBottom of page Link to this message  By tommy coffey on Tuesday, October 24, 2017 - 05:43 pm:

I only dug out enough tar to expose the capacitors but the lumps on the other side look the same as the ones with the rolled foil capacitors.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jim Eviston on Tuesday, October 24, 2017 - 07:00 pm:

The core is a bundle of iron wires.The top of which protrudes out the top of the coil,under the vibrator.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Scott Conger - Wyoming on Tuesday, October 24, 2017 - 08:08 pm:

Jim

most are a bundle of wires...some of the KW's (I think KW's...maybe JC Whitney??) built in the 60's-70's had a number of flat plates, sort of like a bunch of small engineer's rulers stacked up and wound around


Top of pagePrevious messageNext messageBottom of page Link to this message  By John F. Regan on Tuesday, October 24, 2017 - 09:49 pm:

Scott:

Those flat metal cored KW's usually measure almost 10,000 ohms for the secondary since the wire is super thin. I don't use those windings at all in my new box coils because I think they are kinda frail but they do seem to run OK if you change their usual .18uF capacitor to the "standard" .47uF and make sure that the capacitor dV/dT rating is high. The new flat oval ones have a dV/dT rating around 1700 Volts/uS which is more than double what they have to be to work in the T coil. The coil will run just fine with the .18uF capacitor they come with but the point life would be shorter since there is more arcing at the points. Most of those coils that I have run across have the box still in good shape so I don't do anything to them other than pass them to someone who wants them and will put new points on them and install a correct capacitor.


Add a Message


This is a private posting area. Only registered users and moderators may post messages here.
Username:  
Password:

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration