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09/05/2008, 17:54 ErnieY Joined on 05/12/2006 Nr Prayssac (Lot) Posts 3,289 Re: e85 superethanol Don't forget that the vast majority of engines are now alloy whereas previously they would have been cast iron, a potential weight saving of 50% or more. The MGB V8 3.5l engine for instance was 40kg lighter than the standard 1.8l iron one. My doctor said one drink per day, I can live with that !    Report

09/05/2008, 22:18 Moulin85 Joined on 23/09/2007 Posts 19 Re: e85 superethanol I agree with some of what is being said. I’m a sports car nut so except for freedom of choice I see little justification for vehicles like the Q7, but I’m willing to bet that it puts out fewer pollutants per mile than an SU carburetted MGB or the majority of other cars of that era.    Report

10/05/2008, 8:07 ErnieY Joined on 05/12/2006 Nr Prayssac (Lot) Posts 3,289 Re: e85 superethanol After 30-50 years and billions of £/€/$ spent on development you might hope so but of course comparing diesel emissions with petrol is fundamentally unfair as the types of emissions are completely different. I'm no chemist but it stands to reason that if one vehicle A can travel only 24 miles on a gallon of fuel and vehicle B travel 1/2 as far again (my MGB will do 36mpg on a motorway run) then there can be no argument that in terms of sheer volume of gasses and pollutants vehicle A has produced more. What those pollutants are and their relative environmental impacts is another subject. Actually though you might be quite surprised at what a properly maintained and carefully up SU carburetted MGB can achieve, (sorry to keep harping on about MGB's BTW but as as an owner for 20+ years they are something I know quite a lot about and the engine & variants were used in untold other vehicles so is reasonbly representative of the era.). Below is a table of the Arizona emission standards for the MGB and although mine falls within the earlier year groups with the fitting of the later HIF SU's and a rolling road optimisation of the needles and ignition system, at MOT time it would always significantly better the figures for the final 1980 model, and remember, for the US this would be the engine strangled with a single Stromberg carburettor and auxilliary air pump (a c0n if ever there was one) resulting in a miserable 65bhp ! I don't have the actual numbers in front of me at the moment but I know I achieved HC's of around 150 and CO's of a fraction over 1.0 and 36mpg was exactly the same as we got from the 2.0l fuel injected Sierra we had for a few years. ARIZONA EMISSIONS STANDARDS FOR THE MGB BY YEAR GROUPS Idle Standard Cruise Standard 1967-71 HC 500 ppm 500 ppm CO 5.5% 4.2% 1972-74 HC 400 ppm 400 ppm CO 5.5% 4.2% 1975-78 HC 250 ppm 250 ppm CO 2.2% 2.2% 1979 HC 220 ppm 220 ppm CO 2.2% 1.65% 1980 HC 220 ppm 220 ppm CO 1.2% 1.2% My doctor said one drink per day, I can live with that !    Report

10/05/2008, 10:00 Moulin85 Joined on 23/09/2007 Posts 19 Re: e85 superethanol Vehicle emissions are measured as an average per mile using an international standard formula and while mpg obviously has a direct bearing, how the engine uses the fuel is the main factor. The figures I have just found in Autocar give the Q7 4.2 V8 petrol as 326g/km CO2, 294g/km for the V8 diesel. This is half the figure I read somewhere recently for the 1971 1100cc Ford Escort!   At the end of the day there are so few Q7’s, Aston Martin’s or Ferrari’s etc that getting rid of them wont make a nats difference to the environment but they are the soft political target to make people feel they are doing something. Try suggesting, as we did last year, that the office staff should wear a thicker top rather than turn the heating up and see what reaction you get!    Report

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