At 11:15 AM 1/18/2001, Dave Baker wrote: >Can anyone recommend a good book on the basics of VW engines? Well, only the people with HTML capability are reading this at all (hint, hint). But many here would suggest you checkout a copy of _Bosch Fuel Injection and Engine Management_, Robert Bentley Publishers, available from Bus Depot, Bentley etc. > Bentley and Haynes assume you know (or don't need to know) how the > catalytic converter works and what the O2 sensor does. The cat takes in raw exhaust and passes it over a catalyst bed which promotes oxidation and other chemical combinations to clean up stuff that's either leftover from, (hydrocarbons), or produced by (CO, oxides of nitrogen) the combustion process. The simplest cats only deal with mice I mean hydrocarbons, and it's this ability to promote the burning of stuff that's otherwise too thin to burn that makes them glow in the dark when your mixture is way rich. The O2 or lambda sensor is actually a tiny chemical battery which produces a voltage if there is oxygen on one side of its active element and not the other; and not if not. It only works when it's hotter than about 300C/500F, so newer ones have a built in electric heater to get it started faster. It's too close to an on/off signal to be directly useful for adjusting mixture, so the ECU biases it to half a volt and treats it as "greater than half a volt means too rich, less than half a volt means too lean, therefore whichever way it is correct until it goes the other way."
> I'd like to get a better understanding of how all the various components > discussed on this list work together to make the motor go. You know, > foot bone connected to the knee bone stuff. Nonononono, the foot bone connects to the accelerator bone. Sheesh! david
David Beierl - Providence, RI http://pws.prserv.net/synergy/Vanagon/ '84 Westy "Dutiful Passage" '85 GL "Poor Relation" |
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