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Grease Monkey
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Grease Monkey
Joined: Jul 2008
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I have a 1950 Chevy 3100 1/2 tone truck, with a 216 c.i. in-line 6 and a 6 volt electrical system. Externally mounted on the outside of the coil is what looks like a condensor/resistor. I managed to break the wire and am looking to replace it. From what I could find on the Internet, it appears to be a discharge resistor. On the end of the resistor it has a "D-R", a number "1910147" and the marking "3mf". I found some other Internet info that refers to it (or something else?) as a ballast resistor. My understanding is that it supports the coil at start-up and low rpm's. Anyway.... wonder where I can get one?
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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Hi DWinn, As a first time poster, a great big welcome to our site. Hope you find us helpful and neighborly. The item you are looking at is the condenser. The 6-volt system does not use a resistor. Go to your nearest parts house and order a condenser for a 1954 car. That will solve your problem. Any more questions, come on back.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: May 2002
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ChatMaster - 6,000
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ChatMaster - 6,000
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DWinn
With the marking "3mf" indicates it is a condensor (capacitor in electronic terminology) not a resistor. As Ray suggested most part stores should be able to supply.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Dec 2001
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ChatMaster - 10,000
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ChatMaster - 10,000
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This 3mf condensor on the outside of the distributor on a 49 probably is to reduce static noise in the AM radio. I think those ignition condensers are usually rated at 2mf.
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: May 2002
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ChatMaster - 1,000
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ChatMaster - 1,000
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From my 1941 edition DELCO-REMY Catalog A-101,condensers (rated in microfarads),have certain applications,relative to the speed range of the engine they will be used on. High speed range engines(please note,the book gives no actual rev range),require a low condenser value of aproximately 0.2uF capacity. Medium speed range engines require a medium value condenser of approximately 0.3uF capacity. Low speed engines(stationary engines,tractors etc.)require a high value condenser of approximately 0.4uF. Hope this helps out. 
Last edited by CJP'S 29; 07/14/08 04:32 AM.
CJP'S 29
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Joined: Dec 2001
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ChatMaster - 10,000
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ChatMaster - 10,000
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That is good to know. so instead of 2 or 3mF it should have been 0.2uF or 0.3 uF. I also suppose that an eight cylinder distributor would require a different uF condenser than a four cylinder engine, at the same RPM, that seems logical to me.
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: Jul 2008
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Grease Monkey
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Grease Monkey
Joined: Jul 2008
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CJP's 29:
As stated by others above, it the condensor just for static, or does the condensor have something to do with coil sccording to your book. Thanks!
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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The condenser is critical to the operation of the ignition system. The condenser can be installed on the coil (as this one apparently is) or on the distributor. As a final check, remove the distributor cap and see if there is an internal condenser mounted by the points. If so, then the condenser in question is a radio item. It will be connected to the 6-volt + line to the coil.
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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