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On 6 Jul 2002, at 12:50, Ben Doughney wrote: > I put my new spark plugs back in my Fasty again, because I thought I might > as well change them. The old spark plugs that were in there were Bosch W5BC. > The new ones are the ones I usually use; W8AC. What is the difference > between the two? On the W5BC's the electrode was sticking out further, does > this mean it is a hotter plug? The B means extended tip compared to the A. The heat range is the 5 which is WAY off for our engines. I don't remember which way it goes, whether 5 is hotter or cooler than 8. Somehow, I think these are cooler. Most people don't understand what this really means. The goal in the end is to get your plugs to run at some temp, which happens to be the same for all engines and conditions. You choose "hotter" plugs to bring the insulator temp up, while "cooler" plugs bring the temp down. You adjust until they run at the right temp. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/