To answer the question in the subject line - you shouldn't have to fit
hotter/cooler plugs to a standard engine unless there are other problems, in
which case the change of plug is only getting round the real problem not
curing it. A hotter plug will have a longer nose which will heat up more
and burn oil deposits off better, if your plugs are oiling up. But the
down-side is that cylinder temperatures will rise (the plug plays a
significant role in transferring cylinder heat) and the increased heat could
cause pre-ignition or other heat-related problems. Plug oiling means either
it isn't firing properly or excess oil is getting into the combustion
chamber from somewhere.
PaulH.
----- Original Message -----
From: "James Schulte" <schultejim@msn.com>
To: "MG Club Philadelphia" <Philly_MG_Club@yahoogroups.com>;
<Mgs@autox.team.net>
Sent: Saturday, December 25, 2004 12:42 AM
Subject: Hotter plugs..what advantages/disadvantages
> I put in NGK BPR5 plugs in my 69C at the suggestion of someone on the
list,
> because I'm still burning some oil.
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