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- From: Frank.Mallory@f417.n109.z1.fidonet.org (Frank Mallory)
- Sender: Uucp@blkcat.UUCP
- Path: sparky!uunet!blkcat!Uucp
- Newsgroups: rec.autos.tech
- Subject: Spark plug specs and old cars
- Message-ID: <719262088.F00001@blkcat.UUCP>
- Date: Fri, 16 Oct 1992 09:55:08 -0500
- Lines: 21
-
- DH> From: harling@miki.pictel.com (Dan Harling)
- DH>
- DH> I was always under the impression that the heat range was at least
- DH> related to the length of the plug; i.e., how far into the heads they
- DH> extend. Given the 14's I took out of my car and the 18's I bought to
- DH> replace them to prevent fouling (all other digits being equal), the
- DH> 18's had visibly more length to the threaded section. This makes
- DH> sense, as putting the plug further into the cylinder will cause it to
- DH> pick up more heat.
-
- Assuming that the original 14s were correct for your car, you should remove the
- 18s IMMEDIATELY. Using a plug that has a longer threaded portion than your
- cylinder head is designed for will ensure, as a minumum, that you will in time
- be unable to remove the plugs, due to accumulated deposits in the exposed
- threads.
-
- Hotter plugs typically have a longer insulator nose, which can only be seen by
- looking inside the metal shell of the plug.
-
-
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-