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- Xref: sparky rec.autos.tech:13995 alt.autos.antique:2007
- Path: sparky!uunet!stanford.edu!rutgers!news.columbia.edu!sff.cc.columbia.edu!sffcu
- From: sffcu@cuais01.cc.columbia.edu (Stewart Feuerstein)
- Newsgroups: rec.autos.tech,alt.autos.antique
- Subject: Re: Spark plug specs and old cars
- Message-ID: <sffcu.6@cuais01.cc.columbia.edu>
- Date: 14 Oct 92 16:30:05 GMT
- References: <1992Oct14.135431.24851@julian.uwo.ca>
- Sender: usenet@news.columbia.edu (The Network News)
- Organization: Columbia University
- Lines: 38
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-
- In article <1992Oct14.135431.24851@julian.uwo.ca> wlsmith@valve.heart.rri.uwo.ca (Wayne Smith) writes:
-
- >A typical sparkplug (Champion) goes something like RN12YC.
- >The R is for resistor, the C for copper.
- >Can anyone explain the other parameters?
-
- >My car lists an N14Y plug (65 Dodge, slant-6).
-
- >Can someone explain why resistor plugs are used now, and how the
- >added resistance (I measured the resistance of RN12YC to be 30k)
- >effects the whole ignition system? (a 25 year old ignition system)
-
- >Could I use an N11YC plug? What is the best available match today for
- >an N14Y plug?
-
- Resistor plugs are used to reduce electromagnetic noise from the
- cars ignitions system. If your spark plug wires are in good shape you
- should have no problem using resistor plugs. The rest of your ignition
- system should be adequate. If you are really worried about it, buy an
- aftermarket coil (ie. MSD, ACCEL etc...).
- I used to have a document that lists what the spark plug numbers
- mean. I'll fill you in on what I remember. The 14 is the heat range of the
- plug. This is a number that represents how quickly heat is removed from the
- tip of the plug. This number is very important. If your plug is runs too
- hot then your car will pre-ignite and diesel. If the plugs run too cold
- they will not burn off any deposits and will quickly foul and the car will
- run terribly. I would not run N11YC plugs in place of N14Ys. Your looking
- for trouble.
- The N and the Y represent the thread size and length of the plug and
- other details such as extended tip etc. I don't remember which is which.
- Clearly you must run the same thread size and length. If possible you
- should use plugs with the recommended code. However you could run copper
- tip and resistor versions of the N14Y. If you auto parts dealer doesn't
- stock the right plugs. Ask him if he would order them for you. I am sure
- they are still available. Plenty of people are still running Chrysler
- slant sixes.
- -Stew
-
-