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02-11-2018, 09:06 AM | #21 |
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Re: Replacement Ignition Coil
Tom,
After 90 years of service, what do you think the remaining life is? I hope you have a spare coil if you tour out of town in your Model A.
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Bob Bidonde |
02-11-2018, 11:57 AM | #22 |
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Re: Replacement Ignition Coil
About the only thing that effects original tar filled model A coils is carbon tracks that extend up to the metal tube housing. Carbon tracks can short the coil but can be scraped off . Carbon tracks are mentioned in the service bulletins . Like Tom , Ive never had a problem with an original , even if it was beat up and rusty .
Last edited by Purdy Swoft; 02-11-2018 at 12:05 PM. Reason: added the letter w |
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02-11-2018, 12:36 PM | #23 | |
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Re: Replacement Ignition Coil
Quote:
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02-11-2018, 02:07 PM | #24 | |
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Join Date: May 2010
Location: Alabama
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Re: Replacement Ignition Coil
Quote:
I usually look at this forum several times a day . I haven't seen any inconsistant voltage ratings of the Flamethrower type coil that I use posted on this forum . I do remember a post where Mr HL Chauvin posted what one of the Pertronix engineers told him . There was no mention of a voltage difference between the 1.5 ohm and the 3.0 ohm versions of the flamethrower coils . The engineer hinted around that the 12 volt 3.0 version could be the better choice for performance . You question the voltage out put of the Flamethrower coil . What is the advertised voltage of the Bosch 00012 coil ??? If Flamethrower coils have been recalled, WHY hasn't my coil been recalled ? You mention and post a picture of the Bosch 00012 coil , mounted on your car . Post number 14 states that he uses a blue oil filled Bosch coil like yours . If your Bosch coil is oil filled you have yours mounted upside down . Oil filled coils that are mounted wrong usually fail early , no matter what brand that they are . If you used the lower priced oil filled Flame thrower coil and mounted it wrong, that could be the reason that it failed . The solid epoxy coil can be mounted as original , not necessarily so with the oil filled version . I use the 40611 epoxy coil . Mine is the 3.0 ohm 12 volt version . I use the original model A distributor with original style points . Pertronix makes different coils for electronic ignition . Using the 40611 with electronic ignition could be a problem . |
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02-11-2018, 04:31 PM | #25 | |
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Re: Replacement Ignition Coil
Quote:
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02-11-2018, 04:52 PM | #26 |
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Re: Replacement Ignition Coil
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Thanks paul |
02-11-2018, 05:15 PM | #27 |
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Re: Replacement Ignition Coil
From their web site, for 6 volt systems use part number 40111 1.5 ohm epoxy.
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Jon "If you choose to not decide, you still have made a choice!" RUSH Don't tell me what you know..... Tell me what you have done. |
02-11-2018, 07:02 PM | #28 |
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Re: Replacement Ignition Coil
jmeckel
Thank you Paul |
02-11-2018, 07:15 PM | #29 |
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Re: Replacement Ignition Coil
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02-11-2018, 08:36 PM | #30 |
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Join Date: Jun 2010
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Re: Replacement Ignition Coil
Tom's coil is authentic ..... "any color as long as it is black"
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02-11-2018, 09:08 PM | #31 | |
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Join Date: May 2010
Location: now Kuna, Idaho
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Re: Replacement Ignition Coil
Quote:
Try setting two plugs in your A at .025" and two at .035" and hook it to a scope. Record the firing voltages. Then set the two plugs back to .035". You will see an increase in voltage on those two plugs. Next put on a stock A coil and see if the voltage changes from your 'hot' coil. When the points open and voltage is induced in the secondary circuit, it only rises enough to jump the plug gap, no matter the coil's potential. With your A on the scope, pull the coil wire out of the distributor cap and watch the voltage rise on the scope as you hold the wire further away. In this case the 'hot' coil will produce a longer spark than the stock coil, because it has more voltage potential in reserve. In normal use, this higher potential is never reached. |
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02-12-2018, 12:17 AM | #32 |
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Re: Replacement Ignition Coil
40 Deluxe is correct
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02-12-2018, 01:07 PM | #33 |
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Re: Replacement Ignition Coil
I believe that Ford increased spark plug gap to .035 before model A production ended ... Anyway , I have always set my spark plug gap at .035 on my model A's and most others with points ignition . Spark plug gap had nothing to do with the rpm increase after installing a performance coil . The reason being that the gap had allways been at .035 , not readjusted to .035 after the installation of the flame thrower coil .I agree that more spark plug gap , to a point better burns the fuel . I agree that spark plug gap increased with the introduction of electronic ignition . The coils would have had to have been improved to handle wider spark plug gaps . Standard , ( not necessarily brand) , replacement coils for points ignition will fail rather quickly If the gap is opened too wide ! I have used other performance coils and they all increased idle rpm and noticably improvement performance . This is my experience .
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02-12-2018, 01:19 PM | #34 |
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Re: Replacement Ignition Coil
your claim about better performance would not be measured by most by a change of rpm at idle, which isn't much of a yardstick.
Are there any dyno data to support this claim. What is happening at speed is the real measure. Somehow 10K volt coils got us thru the first 80 years of the Model A, and suddenly they are inadequate? |
02-12-2018, 01:49 PM | #35 |
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Re: Replacement Ignition Coil
I figured that would be the next negitive comment . As I have said many times before , I have nothing to prove or gain here. Actually I never said that idle rpm was the test of increased power. Performance coils obviously are not for everyone . You could probably find a coil that would fill your needs , if you need one . at NAPA.
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02-12-2018, 06:34 PM | #36 |
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Re: Replacement Ignition Coil
already did, car runs fine
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02-12-2018, 09:23 PM | #37 |
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Re: Replacement Ignition Coil
My tudor has the coil that was on the car when I bought it 43 years ago. It runs fine.
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02-12-2018, 10:46 PM | #38 |
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Re: Replacement Ignition Coil
None of the model A's that I have now even had a coil when I got them .
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02-13-2018, 02:44 AM | #39 | |
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Re: Replacement Ignition Coil
Quote:
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02-13-2018, 10:45 AM | #40 |
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Re: Replacement Ignition Coil
40 Deluxe, help me to understand what that would have to do with performance at speed, which is where the real money is
anyone got a dyno handy? I suspect that somehow the timing was changed slightly |
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