View Single Post
Old 03-16-2003, 03:58 PM
psfred psfred is offline
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Stock plugs (those initially installed and recommended/listed) for replacement are not resistor plugs, the resistance required for radio noise suppression and coil life is in the wires and boots.

Bosch makes all kinds of plugs...... just make sure you don't have too much resistance in teh secondary circuit or you will have idle problems and high rpm/high load misfire because the spark won't make it across the gap.

The advantage of platinum electrodes, thin film, thin wire, or the large wire/side electrode ones is that the platinum ionizes the air much better, so the spark forms better. It also does not plate off (evaporate), so there is no electrode erosion. Size of electrode is more or less irelevant, the spark size and temperature is determined by the ionization path and wattage. A hotter, "smaller" spark will ignite the air fuel mixture better than a fat, cold spark every time.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote