Date: Sat, 19 May 2007 07:33:58 GMT
From: johannes <>
Subject: Re: DI failure:  happy ending

still me wrote: > > On Sat, 12 May 2007 17:10:52 GMT, Eeyore > <> wrote: > > >The temperatures there aren't particularly excessive. It's entirely do-able > >given good attention to detail. I expect GM cost-cutting was the problem. > > > >Graham > > Graham: > > I would disagree, based on the evidence I've seen. Every car I come > across with a similar direct ignition system seems to get about the > same miles (70K or so) out of these units. Saab, Audi, I think BMW > also suffers from it. Even two Nissan's I've owned, an '88 and a '99 > suffered from the same issue. > > I'm not saying that you could not build electronics to survive in this > environment, but heat is the #1 enemy of electronic components. > Dissipating that heat is very difficult in on top of an engine and > under a hood. When I opened mine (9000), there wasn't any solid state electronics inside, only the copper coils. It's the coils that gets shaken about, so the insulation between the thousands of copper windings weakens, breaks down and eventually short circuit. The electronics is done outside and a trigger voltage of 400V is supplied to the unit.

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