[TR] coil questions

[Dave]

The usual culprits are coil failure is heat amd vibration.  "Spiking" the coil during starting lasts such a short period that it presents no real stress to the coil.  Cars have started just fine (usually) before they devised the ballasted coil with bypass system and is less complicated but I see no reason to go to extra effort to undo such a system that is already in place.  IOW, if it ain't broke don't fix it.

 

 

Dave Massey


 

 

-----Original Message-----
From: Sujit Roy <triumphstag at gmail.com>
To: Triumphs <triumphs at autox.team.net>; tr8 <tr8 at mercury.lcs.mit.edu>
Sent: Wed, Apr 5, 2017 1:27 am
Subject: [TR] coil questions



I have a spare coil dated '73.  Has technology changed so much that I should discard this and when needed buy a modern one?


There are so many vendors claiming hi tech coils. Is this a load of baloney?


My Stag has a ballast resistor so for starting a full 12 v is supplied to the coil on general running 6 volts is used. Am I killing my coil by spiking it with 12 volts?


The resistance of the coil is specked at 1.5 ohoms.


If I remove the ballast resistor and just supply 12 volts all the time, should I now get a 3 Ohm resistance coil?


Based on the current and calculations below, this sort of make sense. Am I right?




V=I xR  
12 = I x 3 I = 4A
6v = I x 1.5 I =4A


Sujit






-- 


Sujit Roy
Cupertino, California

https://triumphstagblog.wordpress.com/






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