Not a lot.
No Catalyst = bugger all CO2. There will be a lot of Carbon Monoxide, Hydrocarbons, NOx etc, that would have normally been catalysed (if there is such a word) into Carbon Dioxide.
It has occured to me (in the last thirty seconds) that the carbon footprint of GA is actually very small! The detailed research I've carried out in the last five minutes indicates that there is a miniscule amount of CO2 emitted from non catalyst engines. Catalysts make CO2, Engines make VOC's, NOx, CO, water and hydrocarbons, ergo we're low carbon. The harmful effect of these emissions has got to be small considering the amount of flying that takes place so therefore we're green too, and catalysts are bad for the environment.
I thank you.
JC
Petrolhead
Last edited by Dak Mechanic; 14th January 2007 at 19:08.
Reason: Added a bit of info!