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Marv,
When I had my apex seal failure and initially thought the cause was the new type plugs protruding into the chamber, I measured the distance (on the Lead Plug) and its electrode was 5 mm from the inside surface of the combustion chamber. Never measured the trailing because its hole into the chamber is too small to worry about any part of the electrode poking into the chamber..
Ed
----- Original Message ----- From: "Marvin Kaye" <marv@lancaironline.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, November 22, 2006 9:57 PM
Subject: [FlyRotary] Re: Spark Plug Fouling and Temperature
The recent discussions about surface gap plugs and now the fouling issue started me to wondering.... it seems to me if a surface gap plug were available that, when seated fully, the end of the electrode and it's surrounding grounding area was around .005" or so away from extending beyond the surface of the rotor housing, the full spark energy would be just about in direct contact with the combustion chamber. Does anyone know how deep into the housing the end of a typical plug is? Seems like this would optimize combustion by eliminating the need for the mixture to be ignited from within the spark plug hole. Just a thought.
<marv>
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