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General Volvo and Motoring Discussions This forum is for messages of a general nature about Volvos that are not covered by other forums and other motoring related matters of interest. Users will need to register to post/reply. |
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Petrol or DieselViews : 7870 Replies : 157Users Viewing This Thread : |
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Jan 19th, 2021, 14:20 | #141 | |
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More precisely controlled fuel injection strategies (some using up to 8 injection pulses per cycle now), introduction of EGR, improved piston and combustion chamber design to improve swirl, higher diesel injection pressures, have all contributed to improvements in diesel engine efficiency and emissions performance over the years. Compare what comes out of the cylinders on my D24T engine to a brand new diesel engine, and the combustion [in the brand new engine] will be notably cleaner even before after-treatment systems get involved. Last edited by tofufi; Jan 19th, 2021 at 14:28. Reason: Clarification added in [square brackets] |
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Jan 19th, 2021, 14:25 | #142 | |
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NOx is primarily caused under high combustion temperatures and pressures - so under acceleration, steep hills etc. EGR reduces the combustion temperature by reducing the amount of combustible matter in the engine cylinder (the used exhaust gas should have nominal amounts of oxygen left to burn as it goes through the engine the second time). Adblue is added downstream of combustion to mop up NOx. |
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Jan 19th, 2021, 14:28 | #143 |
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I think this explains it in a simple to understand way.
https://www.autocar.co.uk/opinion/te...ficient-petrol
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Jan 19th, 2021, 14:38 | #144 | |
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Jan 19th, 2021, 14:47 | #145 | |
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That said, NOx formation does increase rapidly above 1500-1600 deg C. Last edited by tofufi; Jan 19th, 2021 at 14:50. |
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Jan 21st, 2021, 09:01 | #146 | ||
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From: https://dieselnet.com/tech/engine_fi.php Last edited by tofufi; Jan 21st, 2021 at 09:03. |
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Jan 31st, 2021, 18:28 | #147 |
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I've gone from a petrol to a diesel.
> Now having to commute 60 miles a day > £0 tax > 66 plate. Likely to last me 10 years. By then, we'll have figured out what we're doing about electric cars. > Both cars are now diesel in our household so means less than the half a second of confusion at the pumps. |
Jan 31st, 2021, 18:49 | #148 | |||
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The facts are... there are no facts. Absolutely nobody has done any sort of study taking into account all factors. Perhaps the rise of cleaning products has contributed to people being more ill these days. So much to consider. But banging on about how bad diesels are isn't going to change someone's mind rather just make you look like an extremist and nobody likes those! Quote:
If you can't provide any evidence, then best not bother saying something quite "out there" Quote:
However the waste products can be made significantly cleaner and thus what comes out the back is quite different. Take railways. Old HST engines were fitted with a Valenta (very old) or Paxman VP185 engine. Now all of them currently operating are running with an MTU engine. Same old diesel going in but completely different smoke coming out. Somewhere along the way, those waste products have been changed to be not as harmful. Yes, still there to some degree but if you're basically trying to say a 1970s diesel car will provide the same emissions as a 2020 diesel car, nobody will believe you as (while I have no facts to back this up), I bet my next payslip it's not true. You even said it yourself, a lot is trapped by the DPF or other such filters. If the bas gasses can be changed into soot, that's completely different to it coming out the back of the car. At the end of the day, no matter what the poor people of the 80s and 90s were told, that was 30/40 years ago. The young drivers of today care about price, style and electrical gizmos. Perhaps to an extent environmental factors but I suspect both modern petrol and diesels are about the same in the tests by which they are measured for pollutants. Last edited by anotheruser; Jan 31st, 2021 at 19:51. |
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Jan 31st, 2021, 19:26 | #149 |
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I also found the part of this thread discussing electric vehicles and how "we're not ready" interesting.
Like it or not, it's likely they'll become mainstream. There are many silly questions that were asked about those in terraced houses, or what happens if you don't work or this or that. The answer simply is that some people will miss out. Yes, amazing to say but that's the truth. There was a proposal that people in the future wouldn't own cars but pay some sort of fee to "rent" one. If going on holiday, when it gets nearly empty, you drive to a service station and swap it for a new one. Yes, this means lugging all the luggage between the two cars but that's the best answer so far. Remember, it's not "if" electric vehicles will take over but "when". Instead of asking the question, work out a solution. If you put your hands up and say there isn't one, it's that you're not really interested in finding one really. Because many of the questions could be asked of things like the internet or telephones. The answer is that the industry will find a way. They found a way to upgrade copper wires to fibre optic (to the cabinet at least!) (and there's still a long way to go on that), just like they found a way to install phone lines to begin with. When demand increases, companies will want to make money so will invest and make their billions. |
Jan 31st, 2021, 20:05 | #150 | |
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