[Mg-mmm] MG PA spark plugs

[Peter Green]

Lawrie,

The original plugs were 1/2" reach.

Peter.
  ----- Original Message -----
  From: Lawrie Alexander
  To: MMM Group
  Sent: Tuesday, October 27, 2009 5:08 PM
  Subject: [Mg-mmm] MG PA spark plugs


  Hi, Folks,

  My rebuild of PA engine # 1038A/135P continues, following the disappointing
  failure after 118 miles when the core plug on the top of the head decided to
  pop out. I'm glad I decided to tear the engine completely apart rather than
  just draining the oil several times as numerous problems were revealed,
  largely due to, shall we say, less-than-exemplary work by the English
  specialist rebuilder.

  While I had the head on the bench this morning, I noticed that the spark
  plug hole threads are quite long. The engine had been fitted with 1/2" reach
  plugs which, I noted, put the spark gap barely inside the combustion
  chamber. I tried a 3/4" plug and it appears to put the gap closer to where
  the incoming mixture leaves the intake valve. My Blower's manual references
  a KLG LK1 plug as being the one the factory fitted but I have no reference
  books which tell whether this was a 1/2" or 3/4" plug. While the car ran
  reasonably well with the 1/2" plugs, I am wondering if there is anything to
  be gained by fitting 3/4" plugs.

  Any comments from our P-type owners who may have tried both?

  TIA,

  Lawrie
  _______________________________________________
  Support Team.Net http://www.team.net/donate.html

  Mg-mmm at autox.team.net
  http://autox.team.net/mailman/listinfo/mg-mmm

  You are subscribed as p.green at mgk3.co.uk

  http://www.team.net/archive