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On Sun, 2002-09-15 at 21:25, Keith Park wrote: > WOW! > > I had alot of carbon build up under the intake valves when I did my last > valve job... not this bad and not on the head but just the valve. I do have > and had working thermostat linkage and most of my driving is highway. My > old boss at the garage suggested occationally using marvel mystery oil to > prevent this... I have tried this and will see when the heads come off again > in a few years. > > Im my case, the buildup cut the low end off the motors HP curve. > > BTW... one head is fly-cut or a 7.7:1 head and the other is a 7.2:1 stepped > head :) > Carbon on the back of the valve head is kinda normal. But this kind of carbon is caused by the way our FI works. The fuel on one cylinder of each head is sprayed on a closed valve. The other cylinder on each of these heads was pretty normal. (valve open cylinder) -- Russ Wolfe '66 FB MT (It drove) '71 FB AT '65 Bug (not running) russw@classicvw.org http://www.classicvw.org ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/