Dahman, Ken wrote:
>
> TR3 Drivers,
>
> I have been following the thread Re: TR6 spark plugs and a question
> arose about TR3s. I am using
> Champion RL87YC plugs as a replacement for the original, listed in the
> owners manual, Champion
> L10S plugs. The RL87YCs are not off the shelf items but I can order them
> from the neighborhood parts store and get them in a day or two.
>
> My TR3A runs a little rich and seems to like it that way but, on
> occasion, when the choke sticks, it starts to foul the plugs and
> backfire. It is not a big problem, solved by pushing the needles down
> and remembering not to pull the choke out so far. However, even when not
> experiencing choke problems,
> the plugs run black. The TR6 discussion string brought up the question
> of whether hotter plugs would help reduce the black build up on the
> plugs and if so, what were the brand and code numbers to use.
>
> In a similar topic, I was told that the R in the Champion RL87YC
> designated a Resistor plug and was I sure that I needed this type. Since
> I was told that this was the replacement for the L10S, I said yes.
> But a question arose as to what is a resistor plug and why does the TR3
> ( stock positive ground electrical system, no radio) need one.
>
> Anybody on the list care to clarify either or both subjects?
>
> Thanks,
>
> Ken.Dahman@anheuser-busch.com
> 1959 TR3A
> Ballwin, Missouri
> (314) 391-0016
KEN:
I started the TR6 plug discussion about a week ago, and can honestly say
I've become an expert. Lot's of good input from the list, plus much
research and testing on my own.
If the black on your plugs is a dry, sooty black, then they are cold
fouling and a slightly hotter plug would help. But, there may be an
ignition or mixture problem that should be addressed to totally rectify
your situation.
The resistor plug is not necessary if you don't have a radio or other
items susceptible to ignition "noise". However, it's getting hard to
find non-resistor plugs. Using them won't be a problem - they just cost
a little more than the old standard plug.
Check out:
http://www.edelbrock.com/automotive/sparkplugs.html
Martin Libhart
1972 TR6 (driver)
1970 Spitfire Mk.3 (under restoration)
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