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02-23-2015, 12:21 PM | #1 |
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proper coil/distributor combination for '39
A friend is helping a friend with his '39 deluxe 85 HP that is hard to start when warm. What is the proper ballast, coil, distributor combination for that year? should it have the ballast under the dash on the firewall with the coil mounted on the distributor?
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02-23-2015, 12:27 PM | #2 |
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Re: proper coil/distributor combination for '39
If it has the original distributor, it would be a "Helmet" type with the coil mounted on top with 2 screws. The condenser is also mounted with the distributor. The ballast resistor is under the dash.
For reliability, I would have the coil redone by Skip Haney in Florida, and maybe get a new condenser. The ballast seldom causes any problem |
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02-23-2015, 12:27 PM | #3 |
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Re: proper coil/distributor combination for '39
Here is the wiring diagram if that help you any. The original coil was mounded on the distributer. There was a resister unit mounted under the dash.
The resistor assy is 18 12250 and used 32-48. Last edited by JSeery; 02-23-2015 at 12:41 PM. |
02-23-2015, 12:35 PM | #4 |
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Re: proper coil/distributor combination for '39
Yes, '39 would have a resistor on the firewall behind the dash, '37-'41 helmet type distributor with a two screw mounted coil on top of the distributor. The distributors in those years would have used some different advance weights. Not sure what advance curve would be stock for '39, but the '41 advance curve may have been considered to be the best.
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John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein Last edited by JM 35 Sedan; 02-23-2015 at 02:09 PM. |
02-23-2015, 12:39 PM | #5 |
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Re: proper coil/distributor combination for '39
And send the coil to Skip Haney for a rebuild. It will save lots of headaches down the road.
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02-23-2015, 12:52 PM | #6 |
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Re: proper coil/distributor combination for '39
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02-23-2015, 12:58 PM | #7 | |
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Re: proper coil/distributor combination for '39
Quote:
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02-23-2015, 01:06 PM | #8 |
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Re: proper coil/distributor combination for '39
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02-23-2015, 01:28 PM | #9 | |
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Re: proper coil/distributor combination for '39
Quote:
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02-23-2015, 04:00 PM | #10 |
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Re: proper coil/distributor combination for '39
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02-24-2015, 09:57 AM | #11 |
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Re: proper coil/distributor combination for '39
Does anyone know the resistance of the stock coil on a '39?
And what should the voltage be at the coil with the resistor warm and points closed? |
02-24-2015, 10:22 AM | #12 | |
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Re: proper coil/distributor combination for '39
Quote:
Assuming the resistances are the same (close to equal) each would drop the voltage 3 volts with engine not running . A running engine will supply a 7-7.2 volt feed and then they would drop 3.6 volts etc...... Pretty amazing that the coil can and does produce spark at 3 volts supply but they do very well ...... assuming everything else in the circuit is perfect.... |
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02-24-2015, 10:16 PM | #13 |
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Re: proper coil/distributor combination for '39
Bubba, Thanks for the info
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02-25-2015, 08:03 AM | #14 |
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Re: proper coil/distributor combination for '39
I ohmed the coil and resistor last night, both of them cold. The coil measured 1.6-1.7 ohms of resistance between the posts and the resistor under the dash measured .5 ohms. I did notice that one of the terminal nuts on the resistor was loose so I tightened it. It was late at night so I didn't drive the car in order to test the ohms of the coil and resistor when hot.
Also, here are a couple of pics of the distributor and coil. I'm new to flatheads so please forgive my ignorance. |
02-25-2015, 09:12 AM | #15 |
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Re: proper coil/distributor combination for '39
40,
Is it possible the tube coil has an internal resistor in it ? Usually somewhere on the body of the coil there is a note stating this. Charlie ny |
02-25-2015, 09:34 AM | #16 | |
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Re: proper coil/distributor combination for '39
Quote:
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02-25-2015, 09:50 AM | #17 |
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Re: proper coil/distributor combination for '39
Also the coil is mounted where it will get a lot of engine heat. Should be mounted off to side.
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02-25-2015, 01:19 PM | #18 |
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Re: proper coil/distributor combination for '39
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02-25-2015, 01:51 PM | #19 |
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Re: proper coil/distributor combination for '39
Mount the coil like Ford did in 52-53 standing up beside the Generator .
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02-25-2015, 02:04 PM | #20 |
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Re: proper coil/distributor combination for '39
I think your looking at low compression Good Look
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