Date: Sun, 19 May 2002 09:37:20 GMT
From: hohnopsamlid.invalid (Goran Larsson)
Subject: Re: Saab 9000 direct ignition cartridge

In article <ac7fr2$eta$>, Vesku <> wrote: > Due to high price and limited availability of replacement cartridges, I don't know what you considers a high price, but you have to be expecting a very low hourly wage if you think that you can build something cheaper. A new cartridge is something like 50 BigMac & Co here in Sweden and availability is far from limited. They can't be that expensive outside of Sweden and I can't see any reason for limited availability in Finland. Some tips how to reduce the risk of a broken DI cartridge: Never, absolutely never, run the DI cartridge upside down for testing. The transformer oil inside the coils will flow away from the coils and they will overheat. This will damage the cartridge. Don't place the DI cartridge upside down when removing it to get access to the sparkplugs. If you did put it upside down you have to drink a cup of tea after mounting it, but before starting the engine. This will allow time for the transformer oil to flow back to where it is supposed to be. Don't use a too large sparkplug gap with a DI cartridge as the higher voltage needed to bridge the too large gap may damage the cartridge. Aim for the narrow side of the allowed gap range. Readjust gap or replace the sparkplugs if the gap opens up too much. Use the specified NGK sparkplug. Never use non-resistor sparkplugs. The R in BCPR is important. Using non-R sparkplugs with a DI cartridge will damage the cartridge. Use the specified NGK sparkplug. Never use weird sparkplug designs with two, three, or fourtytwo spark gaps as they may damage the cartridge or produce weird ionization measurements that will cause trouble for the engine management. Saab has used these DI cartridges since 1988 and the design has improved over the years. The location of the cartridge has some important advantages but is a nightmare for the components. I don't know how much advantage the older DI/APC system takes of the DI cartridges, but newer engine management systems use the sparkplugs as sensors detecting the degree of ionization during combustion. This is used to control the fuel and ignition parameters for each cylinder individually and to detect engine knocking. Replacing the DI cartridge with something homebuilt will most likely cripple the car. -- G–ran Larsson

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