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1. Spark Plug Heat Range (score: 1): Author: John Mitchell <jmitch@snet.net>; Date: Tue, 01 Nov 2005 22:24:08 -0500; I noticed that Bentley calls for UN12Y Champion plugs in early(pre 73) TR6's and N9Y in later cars. Is the hotter plug called for because of the higher compression ratio of the earlier cars? If so, t; /html/triumphs/2005-11/msg00027.html (7,145 bytes)
2. RE: Spark Plug Heat Range (score: 1): Author: "Hugh Barber" <tr6nut@sbcglobal.net>; Date: Tue, 1 Nov 2005 21:02:00 -0800; Generally, one installs colder plugs when one hops-up an engine. Engines prepared to racing spec use colder still. The black soot you are seeing on your plugs at idle may be caused by the hotter cam; /html/triumphs/2005-11/msg00031.html (7,077 bytes)
3. Re: Spark Plug Heat Range (score: 1): Author: Chip19474@aol.com; Date: Wed, 2 Nov 2005 10:18:05 EST; John, My TR6 engine has been modified (Kent TH5 cam, headers, lightened flywheel, combustion chamber profiling, 3 carbs, etc.) I'm using N9Y plugs because the heat range of these plugs (cooler) is a; /html/triumphs/2005-11/msg00043.html (8,048 bytes)

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