Point well taken Al,
We do see these type of coils attached to the valve cover of cars. As was mentioned directly above the exhaust manifold! In slow/no moving trafic this must cause considerable environmental heating. The concern of the coil being fired more often is important and should be considered. The solution is simple just mount the coils away from the engine and use a cool box. The question is how many of these things HAVE failed? A single failure could be a result of a failure anywhere in the manufacturing process. Put more simply, the thing might have been going to fail anyway. How many people have had a LS-1 coil fail in the group?
Bill Jepson
-----Original Message-----
From: Al Gietzen <ALVentures@cox.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 18 Jan 2006 11:38:10 -0800
Subject: [FlyRotary] Re: LS1 Coil Failures
There may well be a duty cycle problem, but I doubt it. Older ignitions used a single coil of similar type firing all 8 cylinders. I would be more likely to suggest it was a "bathtub failure curve" failure of the solid state "trigger" circuit.
Ah-h-h; and why would duty cycle not have an effect on temperature and failure rate of the ?trigger? circuit? The solid state components do dissipate some heat, and the more cycles, the more heat and other effects leading to failure.
Al G