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Re: Indexing Spark Plugs

To: EUlm890623@aol.com
Subject: Re: Indexing Spark Plugs
From: Andrew Mace <amace@unix2.nysed.gov>
Date: Sat, 31 Aug 1996 09:06:54 -0400 (EDT)
Cc: Triumphs@autox.team.net
On Fri, 30 Aug 1996 EUlm890623@aol.com wrote:

> My fellow Triumphers,
> 
> I have the head off on my Spitfire and am having a go at indexing the spark
> plugs, (i.e. using spark plug washers as shims to aim the plug electrode at
> the intake valve). Having never done this before I've noticed that it can
> take 3 or 4 washers to get  the little suckers to aim properly. This is
> causing some of  the plugs to ride  noticably higher in the head. Is this the
> proper procedure or will the way the plugs are riding couteract any increase
> in performance I hope to gain?
> 
> Great big thanks in advance,
> 
> Eddy Ulm
> 1980 Spitfire
> 1963 TR4

Eddy, FWIW, I tried this years ago on my GT6+, when I was autocrossing 
regularly and looking for "any advantage I could get." ;-) What I ended 
up doing was just getting several extra plugs and simply using the trial-and-
error method to find six that would line up relatively close to the 
intake valve.

I don't know if extra washers will have that much of a detrimental 
effect, but plugs are cheap.

Meanwhile, I'll agree that it probably doesn't make a lot of difference 
in a relatively stock engine, but it made me feel better! :-)

--Andy

  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Andrew Mace                         e-mail: amace@unix2.nysed.gov *
  *                                                                   *
  * Mrs Irrelevant: Oh, is it a jet?                                  *
  * Man: Well, no... It's not so much of a jet, it's more your, er,   *
  *  Triumph Herald engine with wings.                                *
  *   -- The Cut-price Airline Sketch, Monty Python's Flying Circus   *
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