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FI Type 3s do well on CO ; around 0.5% to 1% is the usual level if it's all working properly. That only really leaves Nox, but that's not very nice on the street, hence the catalytic converter. Dave. UK VW Type 3&4 Club www.hallvw.clara.net/ -----Original Message----- From: Jim Adney <jadney@vwtype3.org> To: type3@vwtype3.org <type3@vwtype3.org> Date: 15 January 1999 05:03 Subject: Re: [T3] For whom the bell tolls... snip Jim MacNaughton mentioned his older cars which were clean. I believe you, Jim, but you only mentioned unburned hydrocarbons. My impression is that it has always been easy to get these down in a well maintained engine. The trick, and where all the automotive engineering money is going, is to get HC, NOx, and CO all down at the same time. I don't think your cars, or mine, can do that. Jim ------------------------------------------------------------------- Search old messages on the Web! Visit