Conference terri::cars_uk

It's about three years since I last bought any but you should find N9YC is 
what you want, if memory serves me correctly. They added the C to indicate a 
change to a copper core. Heat range and reach coding remains the same.

Brian

    Thanks Brian. I did notice these, but the socket size is different !!!
    The reach is fine, the size is fine, but I haven't got a plug socket
    to fit ...

    What is the copper core all about anyway ???

  Mark

Sorry Mark, I can't help here. They came out with all the right marketing 
phrases, such as "Better spark" and "Longer life" but since I don't know what 
the core material was originally, I can't even guess at why they should be 
better.

Brian

    I think the copper is supposed to take away the heat more quickly thus
    letting it run cooler.
    
    Richard

    How does this all relate to "hotter" and "colder" plugs ???

    With the N9Y and N7Y champions, one is "hotter" than the other.
    Don't know what this means, but do know that for some racing
    engines, they are started with one type of plug until the engine
    is hot, and then the plugs are replaced with a different type.

  Mark

    
    For each "spec" of plug, i.e Reach/Thread/Taper etc there are 
    Hot and Cold variants, and some in between. Basically the "Cold"
    plugs are for High performance engines, which naturally run Hot.
    The Hot plugs are for low performance engines, which normally 
    run colder. The actual plugs have a different shaped "nose",(the
    bit that holds the centre electrode. Hot plugs are less effective
    at spreading the heat, to the rest of the cylinder block and are
    therefore more "self-cleaning" than cold ones. Using Cold plugs
    in a low performance engine will result in a rapid build-up of
    carbon on the plug and consequent mis-firing.These Cold plugs
    are so called because their construction causes more rapid heat
    dissipation in a high performance engine.
    
    I have a list at home (somewhat out of date) that lists ranges
    of plugs and equivalents from different manufacturers, if you 
    want more info.

    
    From my list of equivalents, Champion N9Y plugs are 14mm thread,
    �" reach mid range plugs, i.e half way between Hot and Cold type.
    
    Equivalents, from other manufacturers are :-
    
    Autolite AG32, Bosch W200T36, KLG FE65P, Lodge HLNY, & NGK BP-7E.
    
    Hot plugs of the same type are :-
    
    AC 44XLS,Autolite AG42,Bosch W160T30,Champion N11Y, NGK BP-6E
    
    Cold plugs of the same type are :-
    
    AC42XLS, Autolite AG22, Bosch W430T30, Champion N6Y.
    
    Remember, use Hot plugs in cool running engines, to minimise plug
    fouling,Cold plugs are for hot running, (high compression) engines,
    in which a hot plug would cause pre-ignition (running on).
    
    Hope this helps.
    

    ... now that IS the sort of information I've been looking for.
    Perhaps now I can get the right plugs for the beast ..

    Thanks, Mark 

�     -<     Plugs?   Spark Plugs?  Out of the Ark aren't they?    8^)    >-
    
�ANNECY::MATTHEWS "M+M Enterprises. Thats the CATCH"   4 lines  21-MAR-1990
    
    So was the previous reply !                                 ^^^^^^^^^^^
    
    J.R.