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post #9 of (permalink) Old 5th November 2008
S.M.A.R.T.(y) Pants
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Back in the late Eighties, there was a couple of ideas bounced around to reduce pollution;

Lean Burn and Catalytic Convertors.

The first principle involved the engine receiving very close to the stoichiometric amount of air to fuel ratio (around 14:1), the benefits were obvious - an efficient burn = maximum fuel economy + decent performance.

The second principle involved strapping an extra silencer & probe containing expensive and fragile rare metals to each exhaust, then setting the engine to run 'dirty' (i.e. rich - around 11.5:1 - this helps the cat warm up more quickly) - ironically leading to reduced performance, increased fuel consumption and higher CO2 emissions.

One of the craziest ideas ever carried through to fruition - it effectively wiped a decade's worth of engine development away at a stroke.


This job should never be complete - the day I think I've done it all, is the day I resign.

S.M.A.R.T. Technician
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater
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