Date: Sun, 17 Dec 2006 16:47:04 GMT
From: johannes <>
Subject: Re: DI cassette failures

- Bob - wrote: > > On Sun, 17 Dec 2006 14:25:45 +0000, Eeyore > <> wrote: > > >> > > > >And all because the GM accountants - sorry bean counters - got involved. > > You mean the failure rate ? I disagree that it's the fault of the GM > accountants, although I'd be happy to blame them for lots of other > things. > > I own of have owned three cars with DI type systems, two of them > relatively "reliable" Japanese cars. On all, a DI coil has gone bad in > the 50-80K range. And, I'm the sort of guy who maintains his cars so > it's not related to that. Likewise I've heard of issues with many > makes and Audi was wholesale replacing DI coils at such a rate that > the manufacturer could not keep up, there was a worldwide shortage > with folks waiting months to get parts. Saabs seem to average 75K. > They do have the disadvantage of not being able to replace just one > coil. > > I think the problem is with putting electronics on top of an engine > where they bake and vibrate every time they run. AFAIK, there is no electronics in the DI, the electronics processing is done elsewhere. The DI receives 400 Volts to each coil which steps up to the spark voltage. The higher input voltage reduces the bulk of the coils. The failure is in the insulation of the coil windings.

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