Re: Homebrew Printed Circuit Boards



Arny Krueger wrote:

"Eeyore" <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote in
message news:4613B363.B2010480@xxxxxxxxxxx
Arny Krueger wrote:

Bret Ludwig wrote:

Yes but they don't always work as well. Look at the
coil-on-plug ignitions. The coils are too small to give
a really good zap.

Agreed.

Saab direct ignition here. No problems at all.

The Milan (Mercury-badged Fusion) I've been talking about uses direct
ignition (coils directly mounted on sparkplugs) as well. The advantage is no
high voltage distributor and negligable high voltage wiring.

Indeed. Saab pioneered the concept.

My 1993 model 9000 has something similar but Saab place the coils in the 'DI
module' which sits atop the engine in the valley formed by the 2 camshafts.

DI module failures are not totally unknown but due AIUI to possible
underspeccing of the electronics since the idea was brand new at the time.

Otherwise it's simply a joy ! No HT leads and no distrubutor to go wrong or
wear. An absolutely excellent idea. Saab's Trionic engine maagement also uses
the spark plugs to measure the mixture.

Graham

.

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