The most troublesome aspect of rotary engines in
airplanes has to be the spark plugs. Everyone uses the
BUR7 of BUR9 or the finewire plugs. When you look at
the business end of these plugs your first thought has
to be this is a fouled plug waiting to happen. Even
when not using Avgas fliers like Tracy are only
getting 200 hours on them. With Avgas they last like
25 hours.
These plugs may work ok in a car with a generally
lighter load but they seem ill advised for aircraft.
There a lot of "standard" design spark plugs with the
same thread diameter and thread depth out there. I
wounder has anyone tried a more standard type of plug
to see how they may hold up?
                     John Overman
                     Velocity N711VE (reserved)

--- Dennis Haverlah <clouduster@austin.rr.com> wrote:

> Thanks everyone for the spark plug cleaning
> recommendations.  I tried
> brake cleaner and oven cleaner.  The oven cleaner
> appeared to work much
> better.  I had been running the fine wire RE7A L and
> RE9B T plugs that
> came with my Renesis.  After cleaning they still had
> s slight miss at
> full throttle.  I cleaned an old set of plugs that
> came with a 1987
> engine BUR7EQ L and BUR9EQ T and tried them.   The
> engine ran better and
> had no miss at full throttle.   I believe these are
> the same plugs Tracy
> has been running in his Renesis.  All the plugs are
> manufactured by NGK.
>
> Dennis H.
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:  
> http://mail.lancaironline.net/lists/flyrotary/
>



 
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