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On 27 Feb 2004 at 7:41, Kevin Guarnotta wrote: > With all this talk of FI to carbs conversion I have noticed a little side > discussion on coils. On my bus & squareback I have black coils, but was > recently trying to stock up on some spare stuff (cip1.com sale). So I was > going to get a spare coil for each (the bus is 6V, sqbk 12V). Is the blue > coil worse than the black coil, can you get a black 6V coil? Or black 12V > coil, or do they only sell the blue one? Why blue? I think black looks much > nicer. OE coils were black and came in both 6 & 12V versions. Blue coils also came in both 6 & 12V versions, but I don't know how easy it would be to find a 6V blue coil today. The blue coils are wound with slightly different wire and turns ratios and give slightly more spark energy at very high RPM. They have a very slight performance edge as you get up around 8000 RPM, IIRC. I worked up a MathCAD program on these a few years ago. I can send the file to anyone who has MathCAD if you are interested. At one time the blue coils were a very popular performance item, but nowadays the poor reliability really makes them a poor choice. They have the additional disadvantage that they draw more current in the normal RPM range and thus are harder on points, but the Compufire and Pertronix ignitions don't seem to mind them. Unless you are planning to work well above 6000 RPM there is ABSOLUTELY no reason to bother. Unless you have a counterweighted crank you don't want to go there anyway. There's no coil you can buy that will serve you better than the one that came on your car. I'm sure it happens, but I've never seen a failed OE Bosch coil. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org