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<x-charset iso-8859-1>> What I heard, and I did this with the engine lid off so it was LOUD.. was that random marbles in the combustion chamber sound on the highway under mid to full throttle, would happen when I was running eather too LEAN a mixture or with timing too advanced and also when I used the lower octane gas. keith > A few years ago a friend of mine, a mechanical engineering > professor in automotive engineering, loaned me a book that he > thought was basic enough that I could "get" it. Most of it was, and > it was pretty explicit about knock being a WOT/low RPM thing. > > OTOH, I have no idea what you are hearing at 70 MPH. Perhaps > you're running too rich and the unburned gas is exploding in the > exhaust? I really don't know, just thinking out loud. > > - > ******************************* > Jim Adney, jadney@vwtype3.org > Madison, Wisconsin, USA > ******************************* > > ------------------------------------------------------------------- > Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe > > </x-charset>