Viewing 40 posts - 41 through 80 (of 129 total)
  • Worth paying a premium for a diesel engine?
  • aracer
    Free Member

    As for those questioning whow much of a man you would feel in a 1.4 I am so sorry for you that your masculinity is so fragile that if you dont have a large powerful car it somehow feels threatened..the answer for me would clearly be more of a man than you would as my sense of being a man is not linked to the cc of the car I drive.

    Quite right. In order to prove your manhood you simply have to have kiddy seats in the back and a "baby on board" sticker.

    molgrips
    Free Member

    The 1.4 Skoda will be slightly slower than the 1.9 diesel in terms of out and out power.

    0-60 maybe, but the 1.4 will feel way way slower – as I can testify. In a 1.4 you'll be forever having to wedge it in 3rd to get anything at all to happen. In the D you'll be able to squeeze the pedal and get pushed forwards whatever gear you are in.

    As for reliability of diesels, it's not a myth, it may be a touch out of date though. In the old days a diesel benefited from being overbuilt, and running at low revs all their lives, but they didn't have to worry about a HT injection system. So no damp start problems, no mixture problems, no carburettor, no fuel quality issues, no spark plug issues, no HT leads etc etc etc.

    molgrips
    Free Member

    PS can't believe the Honda 2.2 iCDTI isn't in the favourite diesel engine list on that telegraph article.

    PPS I'd only drive petrol hybrid if I could tow with it.

    tron
    Free Member

    As for reliability of diesels, it's not a myth, it may be a touch out of date though. In the old days a diesel benefited from being overbuilt, and running at low revs all their lives, but they didn't have to worry about a HT injection system. So no damp start problems, no mixture problems, no carburettor, no fuel quality issues, no spark plug issues, no HT leads etc etc etc.

    Spark plugs tend to last at the very least 20k, and fairly often 50k these days, depending on what plug's specified. About the same as glow-plugs. EFI has done away with cold start issues etc. The only thing that a petrol has to go wrong that a diesel doesn't have an equivalent for is HT leads, and that's a fairly rare occurence (with the exception of Mondeos of a certain vintage).

    On the other hand, diesels have bits that petrols don't, and seem to manage to lunch Dual Mass Flywheels at a massive rate compared to petrol cars. And the bits that pack up on diesels are expensive!

    aracer
    Free Member

    Spark plugs tend to last at the very least 20k, and fairly often 50k these days, depending on what plug's specified. About the same as glow-plugs.

    Strangely my glow plugs manage rather more than that (think I had to have them done at ~90k).

    On the other hand, diesels have bits that petrols don't

    Such as?

    I don't have a DMF flywheel either – them being unreliable is a whole separate issue.

    molgrips
    Free Member

    Tron, I was talking about where the reliability thing came from ie 15 years ago. My petrol's got no HT leads, ignition coils are built into the spark plug.

    PeterPoddy
    Free Member

    So no damp start problems, no mixture problems, no carburettor, no fuel quality issues, no spark plug issues, no HT leads etc etc etc.

    But as has already been said, they have a turbo (Which needs expensive oil) and a stack of emissions kit to go wrong instead.

    Whatever, when I did the sums, there's no way a diesel would have been cheaper to run, so we bought a petrol car. You've got to be doing 20k+ before it's worth it

    And I simply don't like diesel engines in cars. I've driven a LOT of them as well, from most maufacturers, and recently I got to compare our petrol Focus with another Focus with the equivilent diesel engine in it.

    The diesel car was like somebody had filled the front with lead and replaced the throttle cable with some old knicker elastic.
    Whatever the NUMBERS say, to me a petrol engine feels crisper, keener, smoother. There's no turbo lag, no powerband: Dab the gas and get the power instantly, not wait for a second or two, get a huge rush of tourque and then have it die 1000rpm before the redline.
    And the petrol Focus was notably better handling. It just felt lighter on the front and quicker and more accurate to turn in. More bite in the brakes too, and a slightly more supple ride. The heavier diesel engine really dulled the dynamics of the car.
    It's the second back-to back test I've done like this, and the petrol car has won both times…….

    willard
    Full Member

    You lot do realise that you have just totally ruined what was, for me at least, an easy choice at what I was going to get as a next car don't you?

    I had it all lined up… part-ex my 4×4 for a five year old (max) Skoda Octavia estate diesel and drive off into the sunset smoking pipe and putting leather arm patches onto my tweed jacket.

    I now find out that I might as well not both buying one because even the 56 mpg figures that parkers bandy around for the 1.9PD TDi version are going to cost me money because I do less than 15k a year.

    So, you swines… What am I going to do now? Huh? It's taken me a year to think about selling my 4×4 and now it's gone totally out the window.

    molgrips
    Free Member

    Turbos.. we are talking about old diesels here.. turbo just went in my old diesel that my neighbour now has.. after 185k miles. Can't really complain about that 🙂

    , not wait for a second or two, get a huge rush of tourque and then have it die 1000rpm before the redline.

    I invite you to come and drive my Passat 2.0 TDi. It categorically does NOT do this. Seriously, it pulls more and more up to the red line.

    There is turbo lag, unless you leave the tranny in S mode, when there's none. As for handling, yep, agree. Personally I don't like the way you have to downshift in a petrol car to get it to accelerate, and I also don't like the way I have to fill up 30% more often 🙂

    molgrips
    Free Member

    Oh and willard – MTFU, sell the chelsea tractor, get the Octy and enjoy torquey effortless motoring 🙂

    NikNak7890
    Free Member

    Get an Octavia Scout 4×4 tuned for 180 bhp and get the best of both worlds 😉

    DrP
    Full Member

    I tell you what i like the look of – the new VAG 1.4 turbo engines – 140BHP, low emissions. Sure – you'll have to get 'em spinning for decent power, but there's something satisfying about low displacement turbo engines!

    DrP

    molgrips
    Free Member

    DrP, I often said to myself that someone should come up with a small turbo petrol engine – lo and behold VW did. Not bad for emissions but you've still got turbos to contend with which was one of the diesel disadvantages quoted above.

    willard
    Full Member

    Yeah, I thought about the Scout, but given that most of my driving these days is on road and not on the farm (and it is _not_ a chelsea tractor by the way!) it seems pointless to have… Just another bit of transmission to haul around.

    This really is no easier than it was six months ago. Maybe I should just buy another cheap Golf while I decide…

    sharkbait
    Free Member

    Having just got a used Golf GT TDi I have to say I love the torquey nature of a decent diesel. We do quite a lot of country lane stuff and the engine makes it so easy to go at a reasonable speed without having to rev the nuts off it – lovely for overtaking in short distances too.
    I do a 7 mile round trip to school and back every morning and even over a short distance it averages 44mpg even when it's below freezing.
    I've told myself I won't buy another petrol engined car 🙂

    DezB
    Free Member

    I've just gone from a petrol turbo Saab to a diesel turbo Saab and er.. er.. sorry I don't give shit! It's just a car!

    willard
    Full Member

    Nor do I really… But I have a certain number of requirements that I have to meet.

    1) Boot big enough for two spaniels, overall big enough to fit camping stuff, dogs and food in for a week. Bikes to be able to go in the back when dogs are not in there
    2) Good fuel economy
    3) Reliable
    4) Comfortable on long drives

    I'd like to add "exciting drive", "sporty", "off road ability" to that list, but let's be honest here… I don't care as long as it gets me to work daily, get's me back to Suffolk once in a while and down to Wiltshire once a month.

    Ideas?

    thisisnotaspoon
    Free Member

    Personally I reper petrol, I had motorbikes before cars so the concept of changeing gear to accelerate doesn't bother me. Although I do miss being able to flick between gears without the clutch.

    I'd love it if someone built engines designed for LPG, might not be very long lived, but 200bhp per liter would be fairly easily obtainable, although you'd have 2stroke sized power bands..

    DezB
    Free Member

    willard – no budget then! Must be a massive range, no wonder you're having trouble. 😉

    molgrips
    Free Member

    Tinas, are you talking about increasing the compression ratio? Several companies are working on that for ethanol – with appropriate compression you can achieve high specific powers. I think Saab were looking at eccentric crankshaft bearings, kind of like an EBB for single speeds I suppose.. but then again if you have a turbo you can just up the boost which is what some older car enthusiasts have been doing, to get 300bhp from old Volvos I read somewhere.

    Variable compression with atkinson miller cycle using solenoid valves.. very interesting.

    PeterPoddy
    Free Member

    I invite you to come and drive my Passat 2.0 TDi. It categorically does NOT do this. Seriously, it pulls more and more up to the red line.

    Would that be the same 2.0Tdi engine sitting in the VW Eos sitting in our drive? The 140bhp one? (Belongs to the mother in law, we get to borrow it when she goes away)

    Well, it's a gutless slug below about 1500rpm. (Our 1.6 Focus is more flexible) It's the engine I was thinking of when I wrote my last post. Horrible thing. The old 1.9Tdi she had before it was a far nicer engine, even though it didn't have the same headline power figures.

    hora
    Free Member

    thisisnotaspoon I'd go for the 1.4 petrol personally.

    I'd only buy the 1.9TDI if you were planning on owning it for its life. Sorry '90k just run in' doesnt count it for me. ALL engines are a lottery.

    If you were keeping it 2-3yrs- 1.4 everytime.

    willard
    Full Member

    Ah yes, budget… A sore point that. I'd like to say I could afford to go an spunk a wadge of cash on a second hand Cayenne diesel, but in reality I've got about 5k (maybe 6k with a following wind) to spend on something that should maybe last four years.

    samuri
    Free Member

    ditto molgrip's point on the 2.2 CDTi Honda engine. What a silly reviewer. I drive a different diesel car every week and my honda 2.2 beats them all hands down. It's the only one that feels like a petrol engine.

    There isn't enough diesel in the world to supply demand

    You sound ever so slightly biased there because precisely the same point is true for petrol isn't it.

    edit: oh sorry, would I reccommend a diesel engine? Every single time, whether it's for running around town or doing long motorway hauls. I'd never go back to petrol.

    hora
    Free Member

    Would I buy a 90,000 1.9TDI Fabia for over 5k?

    Would I ****.

    would I buy a 90,000 1.9TDI VW Passat for 3.5k? Yes I would.

    You've got to be crackers to spend that much on a high-miler Pope mobile. I drove one on holiday and hated it with a passion. The Panda they replaced it with was five-times better.

    Pile of shit.

    samuri
    Free Member

    Would I buy a 90,000 1.9TDI Fabia for over 5k?

    Would I ****.

    would I buy a 90,000 1.9TDI VW Passat for 3.5k? Yes I would

    You realise they're *exactly* the same engine? Made in the same factory and everything….

    hora
    Free Member

    Oh aye yeah. Everything else round it has been designed with different tolerances and for a different purpose.

    Lets not forget one is a amalgamation of two different floor pans and is designed around smaller engines etc.

    Why would anyone want a Roomster? Jez to the forum….. 😆

    Geronimo
    Free Member

    hora – Member

    Oh aye yeah. Everything else round it has been designed with different tolerances and for a different purpose.

    you appear to post on anyhting to do with cars, but I get the impression that you know ****-all about them beyond reading What Car at the dentist and probably talking b*ll*cks about them with your recruitment colleagues.

    hora
    Free Member

    Geronimo thats a stunning handbag. Do you own many?

    Geronimo
    Free Member

    Call that a handbag?

    hora
    Free Member

    😆

    willard
    Full Member

    Bloke at work has just suggested that I pretend I have kids already and buy a new Berlingo. FFS!! Me, buy a French car?

    Besides, it looks fugly.

    molgrips
    Free Member

    Well, it's a gutless slug below about 1500rpm

    I guess there's something wrong with yours then, mine's fine. Maybe you just don't understand turbo lag?

    I hired a petrol Mazda 2 at the weekend. It was incredibly slow, like back to the days of 1.0 Fiesta/Polos, and only got 43mpg. It was totally gutless below 1.5krpm AND above it. You could trundle along nice and smoothly in say 4th at 40mph – put your foot down, and nothing happened. At all. To get onto motorways and such you had to red line it in second.. relaxed capable driving I think not.

    My Passat is about twice the size, far quicker, far more versatile and gets more MPG. So why do people like petrol again?

    mastiles_fanylion
    Free Member

    My Passat is about twice the size, far quicker, far more versatile and gets more MPG. So why do people like petrol again?

    And costs much more to buy new than a base Mazda 2. What is the equivalent petrol Passat like?

    molgrips
    Free Member

    Sure, MF – wasn't comparing value. I actually quite liked the Mazda. This is about the engine technology itself.

    molgrips
    Free Member

    Here's a dynograph of a Passat 2.0 TDi

    Here's one for a Focus 1.6 Petrol

    TDi develops about 43kW at 1.5krpm, the petrol about 17kW. About two and a half times the power from the diesel at that speed. TDi develops about 280Nm of torque at the same speed, and the petrol about 105Nm. The TDi reaches pretty much max torque at about 1700rpm, and in normal driving engine speeds it's operating at max torque. Hence torquey driving. The petrol's torque curve is quite interstingly flat all through the rev range but the figures are very much lower than the diesel. Hence having to change down to get it to move much at any kind of speed.

    Also note how the TDI's power increases all the way up to its red line.

    anagallis_arvensis
    Full Member

    My mum has a skoda fabia estate 1.9d, gives ugly a bad name but goes as fast as anyone needs a road car to go, handling is precise enough as long as your not driving like a **** and fuel economy seems good.

    ski
    Free Member

    Going back a bit, me and the Mrs both had MK4 Golfs for a while!

    She had 150bhp Gti version, did less miles than me and I had the 1.9tdi 150bhp version as a company car.

    (both did not deserve the gti badge tbh).

    But the diesel felt the quicker car on the road to drive in real everyday traffic scenarios.

    Neither were great drivers cars tbh, but I guess its as close as you can get as a direct comparison to petrol/diesel debate.

    Saying that, she was loaned a 180bhp Gti and that was closer, slightly quicker match for the tdi.

    PeterPoddy
    Free Member

    I guess there's something wrong with yours then, mine's fine. Maybe you just don't understand turbo lag?

    Oh I do. Totally, 100% understand it. And THAT is PRECISELY why I don't like diesels. LAG! **slaps forehead**

    I don't care what the numbers and the graphs say, I just care what it feels like when I twitch my right foot. At the end of the day, a petrol engine is more responsive than a turbo diesel. Tweak the throttle, and you get instant action. No matter how much power you get in a diesel, no matter where you are in the rev range, you've gotta send forms in triplicate to the engine when you want power. 😉 There's always that pause as the turbo spools up and the heavy old pistons slowly wind their speed up against that mahoosive compression. That's why, to me, diesel engines don't belong in sporty cars like said Eos.

    I know I'm in the minority with this, but that suits me fine. I did the maths when we bought our car, and it wasn't worth getting a(nother) diesel financially, so we didn't. And it's lovely to have a smooth, quiet revvy little petrol engine again! 🙂

    Harmitans
    Free Member

    Molgrips, that graph shows the TDI's power falling off sharply before the red-line not increasing all the way.

Viewing 40 posts - 41 through 80 (of 129 total)

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