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22/5/2002 |
Something that came to light during a conversation
with a colleague and friend may be worth passing along. It's one of those things
that, once ingested, lurks in the dark corners of the
mind until a pertinent situation comes along. Such a situation reared its head
a couple of weeks back - so now's the time to spread the word before it
disappears back into obscurity.
Engine's that run on or pink (detonate) for some
seemingly illusive reason may well be suffering from a problem that causes an
apparently correctly chosen heat range spark plug to run too hot. The problem
is worn spark plug threads in the head. This reduces the heat-path required to
cool the plug, consequently it over-heats and causes the aforementioned
problems. So if you come across this one, check the plugs for fit in their
threads. If they're loose, try the next heat range up!