Nels,
A few things spring to mind -
1 Is your cylinder head a later one that needs 3/4 in reach plugs not the
1/2 inch of the L82xx plugs?
2 Though the carbs have been rebuilt, did you just bolt them on and go, or
did you fit them and then carefully set them up correctly by adjusting fuel
mix, balancing them etc?
3 When you say "black material" I assume you means a fine carbon deposit
which would be the result of too rich a fuel mixture. On the other hand if
its a thicker oily deposit it would lead me to think the pistons and rings
are shot, and/or the cylinder walls are worn /scoured and a rebore is
needed. In the latter case you would probably also be getting a bit of blue
smoke from the exhaust too.
Clive
Oxford, UK
===========================
----- Original Message -----
From: "Nels Anderson" <nels@flightsim.com>
To: <mg-t@autox.team.net>
Sent: Tuesday, June 29, 2010 11:13 PM
Subject: [Mg-t] Fouled Spark Plugs
> It seems that as long as I've had my '53 TD the spark plugs have fouled on
> a regular basis. Last summer I had the carbs professionally rebuilt and
> adjusted and expected that to solve the problem. But today I tried to
> drive the car and it was running so rough I turned right around and went
> home.
>
> I pulled the plugs and found #3 fouled (black material between points) and
> #4 somewhat caked with black material but not fouled. #1 and #2 were black
> but not so bad looking. This is pretty much the same thing I used to see
> before the carbs were rebuilt.
>
> Carbs were rebuilt last September, 1300 miles ago.
> Plugs were new last September, 1200 miles ago.
> Ignition wires were new in 2007.
> Distributor cap, etc. new in 2004.
>
> So I'm wondering what I can do to reduce this fouling? Would hotter spark
> plugs work; I'm currently using Champion L82YC. Would a sport coil help
> (hotter spark)? And if so, I believe the plugs have to be regapped; to
> what setting? Currently they are gapped between .020 and .022 according to
> the book.
>
> Thanks for any help.
>
> --Nels Anderson
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