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Discussion Topic: Ignition Coil - Ballast Resistor ?
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Dobin |
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Learning The Ropes
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I am looking for a spare ignition coil to have as a spare on my Seamaster 27 fitted with a Ford 115E 1969 / 1970 Wortham Blake engine.
The question that I keep getting asked is "does your ignition have a ballast resistor?"
Does anyone know the answer as to how I can find out - The only markings that I can see on the coil is 12V HA12 45171 [could be slightly different as it is hard to see] I have also been asked what type of distributor is it? but I can see no markings inside or outside.
I have a circuit diagram that shows one input to the coil going to the ignition switch and the other to the distribitor
Regards
Dobin
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essexboy |
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If you could add a piccky I can idetify the distributor,
just the cap will do.
George Sims
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16E |
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Somewhere in my dim and distant past I trained and qualified as a motor vehicle technician. I always loved and worked with trucks and buses but you have do petrol engines as well.
Ballasted ignition was introduced to aid starting.
When you crank the starter the voltage across the battery drops to 8 or 9 volts ( a starter is almost a short circuit in electrical terms).
A 12 volt coil may start to struggle with only 8 or 9 volts. To get round this the manufacturers fitted lets say a 4 volt ballast resistor and an 8 volt coil in series (one after the other) giving a 12 volt system. However when starting a feed direct from the start side of the ignition switch bypasses the resistor and the coil gets the 8 or 9 volts from the battery thus giving a strong spark. When the engine is running the start switch is released and the coil is energised through the normal wiring getting 12 volts ballasted down to 8 volts (ish).
Based on your description I reckon you have a 12 volt coil unballasted coil. A ballasted system would have two wires to one terminal on the coil- normal feed and bypass feed.
Mal
16E
..Get on and do it!! Adventure before Dementia.
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Dobin |
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Learning The Ropes
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Hi essexboy
I have these two pictures taken from the Ford Industrial Engines Instruction Book that was supplied with the boat when it was new.
Can you identify the distributor from these?
Also is photo of the wiring diagram from the book - [ I have replaced the Dynamo / Generator with a Ignition Protected Alternator that I had to source from USA. ]
If required I can take a distributor photo later in the week.
Thanks for your help
Dobin
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Dobin |
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Learning The Ropes
Posts: 13
Joined: Jul 2007
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Hi essexboy
I have these two pictures taken from the Ford Industrial Engines Instruction Book that was supplied with the boat when it was new.
Can you identify the distributor from these?
Also is photo of the wiring diagram from the book - [ I have replaced the Dynamo / Generator with a Ignition Protected Alternator that I had to source from USA. ]
View Full Size Image
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Dobin |
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Learning The Ropes
Posts: 13
Joined: Jul 2007
Add To Ignore List
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Hi essexboy
I have these two pictures taken from the Ford Industrial Engines Instruction Book that was supplied with the boat when it was new.
Can you identify the distributor from these?
Also is photo of the wiring diagram from the book - [ I have replaced the Dynamo / Generator with a Ignition Protected Alternator that I had to source from USA. ]
Thanks
Dobin
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CoolUncle |
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Could this be a Lucas HA12 coil that was fitted to a number of 1970's vehicles? Mini-Cooper, Morris Minor...
HA12 had no ballast.
Colin
This message was edited by CoolUncle on May-24-10 @ 7:03 PM
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jaguar |
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indeed it does, mk1 cortina's, 1200 and 1500, looking at the engine pics.never knew a lucas coil to be ballasted. or fords own coil(motorcraft).the ballast resistors were usually fitted to vauxhalls,attached to the live terminal of the coil.stand to be corrected,but, definitely a lucas coil.pretty sure the 115E was the 1500 model with the 5 bearing crank(the 1200 only had 3 and was prone to main bearing failure.)
regards,Mike
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This message was edited by jaguar on May-24-10 @ 7:42 PM
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16E |
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I agree with Cool Uncle and Jaguar it is a Lucas part description. I always associated Vauxhall with ballasted systems 9and silly bulb failure warning systems).
I think Ford recalled the 3 bearing engines and fitted 5 bearing units about 1967.
Mal
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..Get on and do it!! Adventure before Dementia.
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jaguar |
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the little grey cells are working tonite, vauxhall were fitted with DELCO-REMY, with the ballast resistor.any way have found a replacement coil here, have sent question to seller and reply was;- the lucas sports coil dlb105 is a direct cross reference to the HA 12.cheers john.
hope this is of use.
regards,Mike
STINKIES UNITED.
chairman of cider lovers united
forum girly swot 25/9/2009, 6/11/2009 , 10/12/2009,8/1/2010 and 2/4/2010
This message was edited by jaguar on May-24-10 @ 8:11 PM
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May-24-2010 @ 3:21 PM
