Odd spark plug colour

[Edward McCarthy]

The Haynes spark plug page notes a "yellow-ish, glazed appearance" resulting
from high speed glazing, i.e., a sudden rise in temperature in the
combustion chamber due to hard acceleration (way to go!)....

-----Original Message-----
From: Phil Payne [mailto:quattro at isham-research.com] 
Sent: Tuesday, January 27, 2004 10:06 AM
To: quattro at audifans.com
Subject: Re: Odd spark plug colour


> Pulled the plugs on the 90 20v today (7a eng code) just to have a look 
> at the condition been
in now for 20k miles. The colour was an orange colour almost like rust,
never seen this before just wondered if anyone out there has any kind of
explanation. I do use an ocatane booster in the fuel but can't believe it's
that. Car runs fine.

There's a handy colour chart in the back of most Haynes' manuals.

--
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803

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