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- Xref: sparky rec.autos.tech:14076 alt.autos.antique:2021
- Path: sparky!uunet!portal!lll-winken!ames!olivea!news.bbn.com!noc.near.net!gateway!miki!harling
- From: harling@miki.pictel.com (Dan Harling)
- Newsgroups: rec.autos.tech,alt.autos.antique
- Subject: Re: Spark plug specs and old cars
- Message-ID: <1992Oct15.174409.14081@miki.pictel.com>
- Date: 15 Oct 92 17:44:09 GMT
- References: <1992Oct14.135431.24851@julian.uwo.ca> <sffcu.6@cuais01.cc.columbia.edu>
- Sender: Dan Harling
- Organization: PictureTel Corporation
- Lines: 23
-
- In article <sffcu.6@cuais01.cc.columbia.edu> sffcu@cuais01.cc.columbia.edu (Stewart Feuerstein) writes:
- >
- > 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...
- > The N and the Y represent the thread size and length of the plug and
- >other details such as extended tip etc...
-
- I was always under the impression that the heat range was at least
- related to the length of the plug; i.e., how far into the heads they
- extend. Given the 14's I took out of my car and the 18's I bought to
- replace them to prevent fouling (all other digits being equal), the
- 18's had visibly more length to the threaded section. This makes
- sense, as putting the plug further into the cylinder will cause it to
- pick up more heat.
-
- Of course, this could be completely wrong, and the heat range might
- just pertain to the thermal conductivity of the plug material, but the
- above example made me think that there might be more to it than that.
- ____________________________________________________________________________
- Daniel A. Harling (harling@pictel.com)
- PictureTel Corp. Opinions expressed are not necessarily those of
- Peabody, MA 01960 PictureTel, but they ought to be!
-