Mia copa, I have been chastised before for not replying to the list.
Ron
-----Original Message-----
From: Parkinson,Ron
Sent: Tuesday, July 13, 2004 10:56 AM
To: 'Douglas Ormrod'
Subject: RE: Spark Plug Choice
Douglas,
For my $.02, I have a modified late TD, and use the shorter reach plug
(colder) because of the higher compression. The theory as I remember it
is that the longer reach (hotter) plug can act as a glow wire like in a
diesel and cause a pre-detonation or knock.
Remember if you are using a sport coil you can run a wider gap than spec
as the addition volts will still arc and that will help.
I don't have many miles since it returned to the road but it is running
great! That is my experience.
Ron Parkinson
2- 53 TDs (Want one?)
-----Original Message-----
From: Douglas Ormrod [mailto:douglas.ormrod@neurological.org.nz]
Sent: Monday, July 12, 2004 8:54 PM
To: mg-t@autox.team.net
Subject: Spark Plug Choice
Hi T folk
The TD spark plug changed form 1/2" to 3/4" reach at engine 22734 - mine
is
earlier than this. My original MG head was bent and cracked so I have
replaced it with a good Wolseley one of unknown age. It has been mildly
worked - ported, bit of a plane, hardened valve seats and new improved
performance cam. So my question is what plugs should I use - is it the
head
that determines choice - and can I find out without taking it off!
Thanks
Douglas
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