Jay Laifman wrote:
> That is interesting that you mention the 2 stroke applications. I remember
> when I was having ignition problems (which turned out to be a bad ground to
> my electronic points) I read up on a whole bunch of different plugs used by
> Alpine people. One person wrote that he used Champion N7Y. The stock ones
> are Champion N9Y. I found the N7Y's at Pep Boys and they were packaged for
> motorcycles. I bought a set, but never used them since I found the
> problem. I went back to the N9YC's and have been happy. (I think the guy
> with the N7Y's was in the SAOC workshop manual in the article about racing
> at the end).
>
> FYI, the guy who rebuilt my engine put NGK BP6ES' on. I booted those with
> the bad ground and now will go back to trying them some day. He recently
> told me that he has done a bunch of testing and has found that a certain
> Bosch plug was more consistent. I don't know which one though.
>
> Jay
The NY7, "I believe" is what they call a fine wire plug.
Typically used as Jay says in 2 stroke apps, where the smaller
tip runs a smaller and hotter spark.
It is often used on carburetted racing engines, where the cam is
so strong that the pilot or progression circuit is too weak to support
a proper mixture, so a richer, but less atomized mixture is provided.
The fine wire plug used to be about all that would light off such a bad
mixture in part throttle conditions.
Nowadays, people solve this particular problem with a MSD
"multiple spark discharge" ignition system.
The down side to the fine wire plug is that the life is pretty short.
Jarrid Gross
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 10:33:54 CDT