Diesel cars might be phased out.

Discussion in 'Off-Topic Discussion' started by Val.., Sep 11, 2014.

  1. Fat Controller

    Fat Controller 'Cuddly' Scottish Admin! Staff Member

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    @nFrost - looking at that, they are currently only running 10 hybrids (Alexander Dennis Enviro 400's by the look of the picture), so you are not yet seeing the full effects. If any of the new hybrid buses are chucking out reek, there is something very, very wrong.

    I have driven some of the newer hybrid buses, and to be fair they are actually really good - the electric drivetrain has got enough torque to get the bulk of such a large vehicle moving, and ride quality etc is not compromised for passengers. One issue that has occasionally reared its head is that the engine can (and will) alter speed (rev up, basically) which triggers a moment of panic if the driver is not expecting to hear the engine note increase -- driver then stamps on what he thinks is the brake pedal....... however, the fact remains that its a rare problem and it is clearly not a fault with the technology but the human behind the wheel.
     
  2. clueless1

    clueless1 member... yep, that's what I am:)

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    Have a look on some of the car forums. The standard response when someone whines that their emissions are up is often that the EGR valve should be blocked, the DPF removed, a sensor hard wired to a resistor that will always give a 'healthy' reading etc.

    I can totally understand why people do such things. You mentioned early that DPF's do work. Maybe, for a while, but there's plenty of people on the car forums who say otherwise and want to remove them because they're sick of them failing. Perhaps they work reliably for a while then give constant grief? There's so much going on in a modern engine, which means so many things that have to work perfectly in unison, and so many opportunities for failure. By comparison, an electric motor and its associated systems entails some coils of wire, some magnets, some capacitors, a battery, some cabling, and some fairly basic electronics. Modern internal combustion = practically rocket science. Electric motor = GCSE physics.
     
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    • Fat Controller

      Fat Controller 'Cuddly' Scottish Admin! Staff Member

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      With buses, nine times out of ten it is a failing turbo letting oil past the seals which then burns and puts smoke out; sometimes, it can be problems on the fuel side (failing CAPS pumps can do it, although not very often, or even tandem pump problems can do it also)
       
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      • rosietutu

        rosietutu Gardener

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        They Stink.!
         
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        • Fat Controller

          Fat Controller 'Cuddly' Scottish Admin! Staff Member

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          If only that were true in practice.

          Firstly, the removal of DPF's being suggested on car forums is not to do with them giving constant grief, but more to do with the cost of them when they do fail. A DPF for mine would run in at about £1300 fitted, whereas a DPF-delete would cost about £300. Essentially, the DPF internals are stripped, the sensor replaced with a constant resistor and in other cases to keep the ECU happy, the EGR is blanked off. However, as longk mentioned any car that should be fitted with a DPF as standard will have it checked on the MOT as of early next year, so those who chose to cut corners are in for a bit of a bill.........

          As for the electric motor being GCSE physics, well, in theory yes; in practice, it is a completley different bag of monkeys. We have a particular series of hybrids that we have had extensive work done on; I was part of the early testing and development which consisted of a guy with a laptop sitting all wired in whilst I drove around - - he could change parameters that not only affected the acceleration and fuel consumption, but also the braking and power regeneration. At one extreme if you as much as farted near the brake pedal it would stop the bus on a knife edge (and I mean proper neck-snapper stuff), at the other you could be braking with all feeling being totally normal only to end up a bus length or more past the bus stop flag, no matter how hard you tried to pre-empt or adjust.

          The basic principles of electrics and electronics are relatively simple - the practicalities when applied are not.
           
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          • longk

            longk Total Gardener

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            EGR; no longer possible sadly, but yes on older systems I totally agree! DPF; too many short journeys. Basically, the wallies bought the wrong car for the job! Modern diesels are great for users who do more than regular short journeys, petrol for the rest.

            DPF filters are generally reliable if everything is ok elsewhere and it gets regular decent runs. It is a filter and as such needs replacement from time to time, but on the whole (with a few notable exceptions) will be good for 100 000 to 150 000 miles.

            And they should be left as they left the factory. So many of the most vocal wallies on car forums have had this chipped and that remapped. How some pratt with a laptop can do a better job than tens of millions of euros backing a skilled team defies logic. It also defies reliability as countless clutch failures, premature head gasket failures and in extreme cases piston failures are proving. I just bought a 2010 Passat diesel with a broken piston. Sent the ECU away for analysis and it has a non standard map! So at 53000 miles a piston broke and the flailing conrod punched a hole in the block!

            Covered by FC.
            Thanks - you saved me typing for hours!!
             
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            • clueless1

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              This bit amused me, because I totally agree 100%. Its like the yoofs that buy a corsa or clio for £300 then lower it and but 'Neverbeen' stickers all over it. My first ever car was a 1.3 litre, 8 valve Ford Escort Mk5 (the overly heavy one). It was the slowest car in the universe. Yet one day at some lights some chavs in a lowered Nova clearly indicated they intended to 'mock me'. I thought to myself. 'yeah, you've got the quicker car, but I'll make you work for it' (silly I know, I've grown out of that sort of thing). The lights changed, we both floored it. They lunged half a car length ahead instantly, but their rear wheel arches, lowered so much, dropped under acceleration to the extent that a plume of blue smoke come off and they had to slow down. My 3 legged donkey pulled ahead with ease. I've always said in conversions, the engineers put a lot of effort into choosing just the right suspension and engine settings and gear rations and valve clearances etc etc etc, just for some chav to 'do a better job' himself.

              Doesn't seem to change the fact that lots of people, both on the forums and people I know personally suffer endless woe with modern engines, particularly diesel ones. Its why I only like older cars. Newer ones seem to spend half their lives bust.
               
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              • Scrungee

                Scrungee Well known for it

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                TVP causes worse emissions
                 
              • longk

                longk Total Gardener

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                I've got an in depth knowledge of how to set race cars up to corner. Despite not having attended a race meeting in 17 years I still have my corner weight scales and set the odd car up at the workshop. My weekends are frequently interrupted by a couple of old race mates phoning up to toss ideas over. Despite this, I refuse to mess with road car set up. You're spot on - hundreds of thousands of miles go into sorting road car suspension out. Most barry boy Saxos end their days going backwards through a hedge or backwards into a wall because some gimp knew better!

                Too many of these problems are the result of wrong car for the wrong job or through the use of the wrong oil!
                 
              • clueless1

                clueless1 member... yep, that's what I am:)

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                But this isn't the fault of the owner. Most people can't afford to change their car on a whim, so they must choose whatever they think is going to be right for them, and stick with it. The car manufacturers and dealers don't help. They tell you that ALL their cars are perfect for you, and people can't be expected to study in depth engineering principles to help them to make an informed decision. So given that a combination of cost and lack of info makes it virtually impossible for someone to be sure they're making the right choice, I still maintain, that newer cars seem to suffer a lot more woe than older ones.
                 
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                • longk

                  longk Total Gardener

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                  I totally agree Clueless. As is so often the case in life the most instructive experience is usually bitter experience.
                  I stand by the fact that many premature problems come about as the result of using the wrong oil though. This may not be the owners fault but the fault of the garage that they use.
                   
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                  • Fat Controller

                    Fat Controller 'Cuddly' Scottish Admin! Staff Member

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                    Also, to be fair @longk I think the manufacturers themselves have a part to play by pandering to the fleet buyers in the guise of long life servicing. I know lubricant technology has improved dramatically, but to expect the oil and filters to perform for 20,000 miles, well it's got to be nuts to be honest.

                    My car is set to long life, however I change oil and filters annually (about 6000 miles) and refuse to buy anything other than the Mann filters and the correct oil as specified by Audi
                     
                  • longk

                    longk Total Gardener

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                    Not really. Most engines nowadays are bombproof thanks to the advances in mass production techniques. Service intervals based on use patterns used to seem gimmicky, but they have proven to be effective.
                    What is nuts/exploitative is the minimal wear tolerances allowed on brake discs nowadays! They're almost on the limit when fitted new.
                     
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                    • Fat Controller

                      Fat Controller 'Cuddly' Scottish Admin! Staff Member

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                      I still think changing it more frequently can only be better for the engine than not, so I will remain a dinosaur :biggrin:

                      The cost of brake discs can be pretty horrendous too - they were one of the reasons I outed the Passat; by the time all the repairs/servicing that were needed at the time were done (inlet manifold, turbo, EGR valve, cambelt and water pump, brake discs and pads all round) I was staring at a bill the thick end of two and half grand!

                      Somewhat perversely, the Audi has been cheaper to run (admittedly hasn't asked for anything other than servicing and a wheel bearing), right down to the filters being a bit cheaper - can't work that one out for the life of me.
                       
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                      • clueless1

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