[Mg-mmm] MG PA spark plugs

[Lawrie Alexander]

Terry,

I was using BP5HS too. The protruding tip does enable the spark to take place
just barely inside the chamber; a regular 1/2" plug has the gap virtually at
the combustion chamber wall.

My reasoning for a 3/4" plug with a protruding tip is that this would put the
spark well into the area where the mixture comes out from the valve throat,
rather than tucked back against the wall. However, not being an expert on
flame fronts and so forth, maybe I'm completely wrong! That's the reason for
this thread on the list .....

Cheers,

Lawrie
  ----- Original Message -----
  From: TATERRY at aol.com
  To: lawrie at britcars.com ; mg-mmm at autox.team.net
  Sent: Tuesday, October 27, 2009 4:23 PM
  Subject: Re: [Mg-mmm] MG PA spark plugs


  Lawrie, I am using NGK BP5HS plugs in the NA....seem to work well but not so
much time or mileage yet....these are 1/2" reach with an extended
nose....recommended by Bob Bazzica for use in all my cars, TA, TF, Arnolt and
NA.....
  What are others using?
  Terry