styria,

the units of resistance are 'ohms' The symbol is a Greek 'omega' sign - the one that looks like a curly 'n' with feet. I don't know how to get the symbol here..... One ohm is a very small amount though, so one normally works in 'kilo-ohms'. 1 kilo-ohm, abbreviated as 1k-ohmssymbol- is equal to 1000 ohms.

As far as I know, the M110 and M117 also use 5kohm supressors. The M119 in my S500 has 2.5kohm supressors.

As to their necessity or otherwise, due to some ignition lead failures, my M110 currently has a mixture of the correct 5k leads on some cylinders, and some non-impadanced spares-shop jobbies on the others. THis will soon be rectified - there is a new set of bosch leads on its way to me as we speak....

With this current setup the idle is lumpy and uneven - as one might expect due to the different combustion characteristics.

I will try to explain it with an analogy to water in a tank.

Think about a tank of water sitting up at roof height. SUppose it has a hose leading out the bottom. If the hose is fat, the water in the tank will drain out in one sudden rush. The flow will have a HIGH FLOW RATE, but SHORT FLOW DURATION. NOw replace the hose with a much thinner one. We will have a SLOWER FLOW RATE, with LONG FLOW DURATION.

now the analogy

water tank system | equivalent to : | ignition system |

quantity of water to discharge | equivalent to : | quantity of electricity or charge, or 'spark' to be delivered to the cylinder |

size of discharge pipe | equivalent to : | ignition lead impedance |

large pipe diameter equals low impediment to flow | equivalent to : | low supressor impedance |

small pipe diameter equals high impediment to flow | equivalent to : | high supressor impedance |

So in English, if we have a low impedance spares shop ignition lead, this is like the fat pipe on the water tank. All our electrical 'spark' will flow very quickly, and act over a very short time period

If install a proper supressor, the higher impedance will result in THE SAME AMOUNT OF SPARK, or electrical energy, being delivered more slowly - hopefully matching the speed of fuel mixture propagation.

The idea is that the combustion process and gas flow takes a little time, so by slowing the spark, it is possible to get the spark to 'last longer' and be present for a much larger portion of the gas combustion process. THis will lead to more complete mixture burning.

It's late, I'm tired, if this makes no sense, let me know and I'll try again.

Ryan