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On 5 Nov 2004 at 23:30, eggmeg@netzero.net wrote: > I too have the 1500S domie pistons. While my car is not on the road > yet, how long can I drive it on 90 octane before it bursts into > flames? > Oh, the humanity!!! You may be fine. It's useful to learn to recognize knock. It sounds like a handfull of marbles being slowly dribbled into a metal wastebasket. If you have it, you'll hear it at low RPMs when you give the engine full throttle. If you don't hear this you may not have a problem. It's never a problem at high speeds or cruising, unless your timing is WAY out of whack (way too advanced.) If you hear this, you can just let up on the throttle at low RPMs, or you can try adding something that can up the octane. One thing that can help here is gasohol, or you can just add alcohol to the gas. Octane enhancers are also sold everywhere, but don't get carried away; use only as much as it takes to make the knock go away. The alternative requires an engine rebuild. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~