In a message of 02 Apr 95  19:49:01, David Beaman wrote:
DB> -> YS .45 side exhaust with a MAC header and MAC 8.5cc tuned pipe.  I am
DB> -> 15% Cool Power fuel.  The propeller is a 10x8 APC.  It is rich enough
DB> 
DB> BALLANCE the prop mostly....
DB> vibration will kill the plug every time.  also check that your not over
DB> 
DB> Try a K&B short plug, i use them in my boat....  45% fuel and viberation
DB> from hell...and the plug hangs in there.
    I have good luck with OS #8's.
 
    Too much compression will kill plugs.  An extra head gasket or two will 
help this.  Aluminum particles from a header and pipe rubbing together will 
kill plugs.  Revving up the engine with the glow power still on can burn them 
out.
    Look closely at the burned out plug wire.  If the ends have a bead like 
it was melted then it got too much heat.  If it is a clean break it was 
vibration.  Too rich can also beat up the element by hammering it with fuel 
droplets.
    Most of these problems come from adding a pipe.  It increases the stress 
on everything.
          
          MC
--- FIDOdoor+ 3.2.6
---------------