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On 15 Jul 2003 at 20:15, Daniel Baum wrote: > The bad news is that it popped a lot from the exhaust as it I accelerated. I > didn't feel any kind of loss of power or bucking as it popped, the ride was > quite smooth. The equation seems to be"more advanced timing = more power but > more popping". Last time I only heard one pop during the entire journey, but > it felt more sluggish. Maybe I should just experiment with different timing > settings till I get it right? More advance will give you more power, but too much advance will damage the engine, so there's a moth and flame component here. You want it set up so that the max advance (with full throttle) will be 28-32 deg (you can have 40 deg while crusing with part throttle.) This is where dist advance curves come in handy. Pops in the exhaust generally mean that the engine is running rich, or that a cylinder is miss firing: You need SOME explanation for why there is unburned gas getting into the exhaust system. Once the petrol gets into the exhaust there are several ways that it can be ignited. It is possible that getting better performance from your engine led you to more "spirited" driving which used the throttle pump more, leading to more gas pumped into the engine. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org