When I looked at the NGK spark plug site and looked up my 1989 RX7 13b
engine, the recommended plug was the one with the extended shank (the part
sticking out of the engine, above the sealing washer). It does not need the
thinner "special" plug wrench.  I think I'll stick with the NGK BR9EQ plugs,
and use my regular old Sears Craftsman deep well socket.  Paul call me cheap
Conner

----- Original Message -----
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, December 02, 2004 6:37 PM
Subject: [FlyRotary] Re: (unshrouded plug ?)required wrench


> I agree with Bill.  I think one reason Mazda wanted to make it difficult
to
> stick any other than the stock plug  is that some plug electrodes can
reach
> through into the combustion chamber and clip the apex seal as pointed out
by
> Paul Yaw.
>
> Ed Anderson
> ----- Original Message -----
> From: "Bill Dube" <bdube@al.noaa.gov>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, December 02, 2004 7:33 PM
> Subject: [FlyRotary] Re: (unshrouded plug ?)required wrench
>
>
> >
> > >
> > >If I end up using these plugs full time later, I will consider Lynn H's
> > >suggestion to remove the eyebrows on the block, but really like to know
> > >why Mazda went to the trouble of putting them on before grinding them
> off.
> >
> >          Simply looking at the eyebrows, they seem to serve no purpose
> > other than to make it impossible (or at least very difficult) to put in
a
> > 13/16" type spark plug. Perhaps this is their intended purpose. The
Mazda
> > folks don't want someone to put in the "wrong" spark plugs, perhaps.
> >
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >
>
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>