Date: Fri, 02 Sep 2005 21:24:17 +0100 From: Pooh Bear <rabbitsfriendsandrelationsnospamail.com> Subject: Re: SAAB Quality Since GM?
Johannes wrote: > Pooh Bear wrote: > > > > mattleibovitchnospaml.com wrote: > > > > > I agree. The DIC shouldn't even be a replacement item. GM's various > > > distributorless ignition setups (since 1984) have proven to be pretty > > > much trouble free and will last "forever" much like any other > > > solid-state electronics. Why is Saab's version so very different? > > > > Because the're too much clever electronics is in that DI cassette ? > > > > As an electronics designer, I'd like to know what the typical failure > > mode(s) is (are). I'll bet there's something(s) straighforward that's > > fixable by design. > > > > Graham > > The failure is related to the heat and lack of cooling possibilities when > mounted on top of the engine. I took mine apart, the insulation in one of > the coils had burned through, I guess it short circuited. > > It also help if you diagnose any overheating problem immediately, i.e. > don't drive round with the temperature gauge at 3/4 mark. It must always > be at a healthy 1/2 mark. You reckon it's just heat ? Obviously that came to mind. Electronics can take some pretty serious heat as long as it's actually purpose designed to do so. Silicon semiconductors have a top limit on operating temp of 200 C. Integrated circuits rather less. Varies with complexity but up to 125C. Graham
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