Eddy,
I have indexed plugs before, but have never used more than two washers.
My philosophy was to get the electrodes as close as reasonably possible.
You may be hurting your performance more than you help by lifting the
plugs up with that many washers.
Are you using compression washers? They do allow a little more
flexibility in exactly where the electrodes end up, as you can go a
little tighter or looser to make the electrode fall in the right place.
I never did any serious testing; dynamometer etc. but my standard "close
enough" was within about a 30 degree range around the optimum point.
At the risk of opening up another wildly ranging discussion I will add
that for the past several years I have been using Bosch Platinum plugs in
all my vehicles. I think it makes them go a little faster than a good
wash and wax; but not as fast as if you vacuum out the interior also.
Jack Brooks
Looking hard for a TR-3
JIBrooks@Juno.com
On Fri, 30 Aug 1996 20:52:39 -0400 EUlm890623@aol.com writes:
>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
>
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