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The Pub For General Automotive Related Talk |
View Poll Results: What configuration would you use for the Veyron? (to RELIABLY make 1100HP & 1250nm) | |||
W16 with quads just like they did | 86 | 64.66% | |
V12 with quad turbs | 10 | 7.52% | |
V10 with quad turbs | 7 | 5.26% | |
V8 with quad turbs | 5 | 3.76% | |
V8 with twin turbs | 14 | 10.53% | |
Something else (please list) | 11 | 8.27% | |
Voters: 133. You may not vote on this poll |
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07-10-2010, 10:15 AM | #31 | ||
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I don't understand why you are questioning the awesomeness of it all?
It's quick, it's reliable and people that can afford them can't get enough of them? Seems like they hit the nail on the head really. Though a MacF1 is still my kind of hypercar.
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07-10-2010, 10:34 AM | #32 | |||
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07-10-2010, 10:53 AM | #33 | |||
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1) It is not Ford 2) It has the same number of letters in its name as Holden 3) It is not a V8 4) It does not run on LPG, CNG, E85 or pixie dust 5) It is quicker than both FPV GT and TE50 T3 6) It does not have stripes, decals or a bonnet bulge 7) It has not won at Bathurst 8) It is not RWD 9) It does not have provision to tow a 2 tonne trailer up hill faster than a (insert other hated model here) . . . 10) They cannot afford the left hand front wheel nut off one even on 1000 days interest free........ |
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07-10-2010, 11:11 AM | #34 | |||
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XA coupe 8.8sec @ 150mph http://www.fordforums.com.au/showthr...coupe+drag+car BA GT-P for the shed Mustang GT for the other half E3 chubsport - fully fat (and slow), sitting there waiting for me to get sick of it and sell it. BA XR6T for a daily NT Pajero for the bush XB 4 door project- swallows a BF xr6 turbo My dad is a generous bloke. He gave away his dead car batteries free of charge.... |
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07-10-2010, 11:12 AM | #35 | ||
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10) They cannot afford the left hand front wheel nut off one even on 1000 days interest free........[/QUOTE]
I saw a quote for the tyres.....$30,000 for a set! Ouch!
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XA coupe 8.8sec @ 150mph http://www.fordforums.com.au/showthr...coupe+drag+car BA GT-P for the shed Mustang GT for the other half E3 chubsport - fully fat (and slow), sitting there waiting for me to get sick of it and sell it. BA XR6T for a daily NT Pajero for the bush XB 4 door project- swallows a BF xr6 turbo My dad is a generous bloke. He gave away his dead car batteries free of charge.... |
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07-10-2010, 11:21 AM | #36 | ||
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no doubt you could build something more powerfull, but the engine already in it was built for the car, it does the job nicely without fuss, if i was a rich speed freak i`d rather send it to a tuner for a tune.
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07-10-2010, 11:26 AM | #37 | ||||
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07-10-2010, 11:45 AM | #38 | |||
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The only reason I've felt the need to criticise it a bit is simply because a lot of posts suggested my questioning of the use of the W16 at all was somehow insane. It's an awesome car, an awesome motor, an awesome achievement, but it's not insane to question the configuration of the engine and the motives behind it. And to ponder alternatives. I'm certainly not the first one to do so, but it seems some on here think it's complete blasphemy... It's not a pro or anti Veyron thread... But if you think you would've done things differently with the engine then do tell... :-) |
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07-10-2010, 11:49 AM | #39 | |||
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07-10-2010, 11:50 AM | #40 | ||
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I would put a Briggs & Stratton four stroke on each wheel, nice set of clippers on underneath, push the supension lowering device and mow the front lawn with it.
Honestly - the Veyron is and always will be an engineering marvel - hypothetically even questioning it's make up on this forum is somewhat perplexing IMO. |
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07-10-2010, 12:00 PM | #41 | ||
Afterburner + skids =
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Replace the B&S with a Tecumseh and then you're in business
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07-10-2010, 12:01 PM | #42 | |||
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07-10-2010, 12:05 PM | #43 | |||
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07-10-2010, 12:14 PM | #44 | |||
Long live the Falcon GT
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07-10-2010, 12:17 PM | #45 | |||
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07-10-2010, 01:39 PM | #46 | ||
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4 litres. 6 Cylinders. 2 Turbos = 1200hp. (9ff)
Looks perfectly reliable to me... :-) |
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07-10-2010, 01:49 PM | #47 | ||
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OK since you prodded if I was to make the veyron I would be trying to use as much proven good tech as I can get my hands on (the v8s they used are apparently very good alone but not capable by itself) which is pretty much what it looks like they did grabbed the best motor they had doubled it then boosted it, sounds perfectly logical to me..
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07-10-2010, 02:01 PM | #48 | |||
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The W16 is a reliable engine (in the context of supercars). It has a warranty, can cold start, and can be driven practically daily. There are very few other cars that can claim the same thing. That american thing - the ugly shelby thing - that's quicker in a straight line on paper, but it would be consistently broken and on your hoist. The W16 doesn't have a lot of boost smashed into it, and everything is designed to last over 100,000kms. I highly doubt that the Volkswagen group would have spent the millions upon millions that they did developing the thing if there was a cheaper, simpler alternative. You don't agree to lose a million bucks per car if there was a better way to do something. Friggin armchair engineers, ripping on things just for the sake of it. |
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07-10-2010, 02:21 PM | #49 | |||
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Thank you for your participation. Hopefully there's still some others who are brave enough to say: "Actually, I might've tried something different - how about this...." without fear of being shot down... Which is what the intention of the thread was. |
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07-10-2010, 02:26 PM | #50 | |||
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They are 'VR8's' as such - VR6 + 2 cylinders - if you don't know they are almost straight 8's. I wasn't aware of any such engine in production? Audi's and the like are conventional quad cam, 90 degree jobbies. |
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07-10-2010, 02:56 PM | #51 | ||
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There were Passat W8's a few years back.
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07-10-2010, 03:26 PM | #52 | |||
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ie they are only 2 cylinders long, and 4 wide, if you catch my drift, not VR8's like a Veyrons... |
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07-10-2010, 08:45 PM | #53 | |||
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So basically what you are saying is the W8 is more compact than a V8 but larger than a I4 (so probably somewhere between a I4 and I6), I would agree with that. So due to the offset of the cylinders, it is a length that is longer than a V8 (of similar bore size) but much shorter than a V16 with similar bore sizes. The disadvantage of the V8 is to achieve the same capacity, you either have to increase the stroke (reduces the rev capacity and increases piston speed to unmanageable speeds) or increase the bore (increases the length of the motor and the weight due to a lot more block). The simple fact is the W16 is not as long as a straight eight of half the capacity, yes it is longer than a V8 of half the capacity but it is shorter than a V8 of similar capacity. A lot of this can be seen here on the web site. VW VR and W engines To understand this you need to think about why VW came up with the VR configuration (VR6, the forefather to the W8 and W16) and the W configuration, they did it to fit larger engines with more cylinders in FWD transverse mounted configurations, something many other manufacturers could not do. The actual length of the Bugatti Veyron engine is 71 cm, the length of the rocker cover of my Ford I6 is 75 cm (actual engine length is probably more like 85 cm) and the length of my Mini I4 rocker cover is 48 cm (actual engine length is probably more like 58 cm). So it appears VW have managed to jam 16 cylinders and 8L of quad turbo goodness producing 883 kw (in super sport) in less overall length than my FPV I6T at 4L and 270 (ish) kw. To me that puts the engineering marvel into perspective. As for your point of the W16 not revving too well, it produces its max power at 6000 rpm, to me that seems pretty good. Show me another 8L engine that revs to 6000 rpm and carries a factory warranty, the list would be very small. Yes an Enzo engine revs to 8000 rpm, but it is a V12 at 6L capacity and only produces 485 kw and 657 nm compared to the W16's 883 kw and 1500 nm. My god, what were VW thinking? Of course other manufacturers are going to criticise the configuration, they could not achieve the same characteristics or performance. As far as I am concerned, when they have done better they will then earn the right to criticise. Lets face it, nothing on this earth will get you to a higher velocity, with as many comforts and with as much reliability, end of story (for now). Did they use the right engine configuration? It would appear so as they have set the standard because nothing else compares, who are we mere mortals to judge?
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07-10-2010, 09:18 PM | #54 | ||||
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07-10-2010, 09:41 PM | #55 | ||
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The Veyron is unusual in that two key requirements were specified by Ferdinand Piëch before development had begun - it was to crack 400km/h, and have 1000bhp.
The engineers struggled to meet these requirements, with a lot of different engine configurations trialled and tested before settling on the W16. For this reason, I'd vote for the first option - W16 - just like they did. |
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08-10-2010, 02:55 AM | #56 | |||
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08-10-2010, 10:20 AM | #57 | |||
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71cm eh - dunno where you found that figure but if it's right then we'll at least be able to fit a V10 in there - schweet. I wonder how wide the W16 is - surely must be a bit wider than a conventional V8 - even tho each 'bank' only has one head. My point was I don't think they had big revs at the top of thier list of priorities as it's a blown motor. Which also makes it hard to compare to anything else N/A but I'm sure if they'd wanted to build a TTV10 that revved to 6k, they could've. The Veyron project went over budget, over time and the thing came out over weight, they had a lot of fun trying to cool the ttttW16 and I'd hazard a guess this might be repsonsible for a bit of the extra weight. The car is amazing and certainly ticked all the boxes it was supposed to, no doubt. I've certainly now been more swayed towards thinking maybe the W16 wasn't such a bad choice after all, and maybe it wasn't a car built around an engine as some suggested at the time? But still, I do wonder if it could've had a simpler configeration and been just as fast and a bit lighter. Nothing wrong with wondering, I certainly don't think it's crazy to do so - I'm not about to go out and build a Veyron beater, I'm not even claiming I could, so it's all pretty harmless in my books - it's not like I was bagging a car anyone owns on this forum... :-) This thread is a question, not a criticism... Might be a stupid question in some peoples books, but in that case they can simply tick the W16 box and go read another thread. If you don't think it's overly stupid to suggest a different configuration for such an engine, then please, by all means, post up your opinion - don't be scared, no ones gonna hold you accountable! :-) |
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08-10-2010, 10:31 AM | #58 | |||
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I'd love to know what else they tried... Thanks for voting! |
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08-10-2010, 12:27 PM | #59 | |||
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Yes a V10 of similar design to the BMW M5 motor may have fitted in the area that was allocated to engine bay in the veyron and yes it may be simpler than the W16 design (not that the BMW is a simple design by any stretch of the imagination). The problem is the M5 V10 is 5L and produces 373 kw and 500 nm, which is 510 kw and 1000 nm less than the W16. Yes the M5 is NA and you could increase these figures by bolting on 2 or 4 turbos, but to get an increase in power of nearly 250% and an increase in torque of 300%, it would have to run some serious boost pressures which will have a detrimental effect on reliability. Also having a lower capacity engine relying more on boost pressure from turbos is more likely to have a peak torque curve that comes in later in the rev range than a large capacity motor running lower boost pressures. So the other option would be to increase the capacity of the V10 to that of the W16 at 8L. Lets just say we do not want to increase the stroke too much as we do not want a truck motor with long strokes and slow to rev (think of the boss motor here, it has often been criticised for its undersquare dimensions). The BMW M5 motor has a bore/stroke of 91.94/75.13 mm, very oversquare and one of the reasons it revs to 8000 rpm but also a reason it does not produce max power until 7750 rpm. Now to produce a V10 that is 75% larger in capacity to 8L and keep the present motors bore/stroke ratio you will end up with a 160 mm bore and 131 mm stroke. I think you will find there is no where near enough meat between cylinder to take a 5L V10 bore out to 160 mm (even if you could touch the bores together which you can't it would end up 80 cm long which is already longer than a W16). Just for the sake of argument, lets just say BMW have managed to fit all five cylinders per bank on the 5L V12 in the same space that VW have fitted 8 and thus have ended up with a motor length of 71 cm as well (I doubt it, I think you will find the M5 motor is longer but I can not find figures). To increase the engine capacity to 8L without increasing the length of the stroke too much you have to increase the size of the bores so lets say we increase the stoke by 25% (now 93 mm) and the bore by 50% (now 137 mm). To increase the bore size by that figure of 50% and keep the same cylinder wall thicknesses you will of course have to increase the overall length of the motor by at least the same amount to accommodate it. Motor length is now 106 cm long (35 cm longer than the W16). Suddenly your V10 requires the length of engine bay that a dodge viper has, not very conducive to mid engine, AWD and reasonable weight distribution. The end result, which I am sure I have clearly demonstrated is that to achieve the same power levels from a motor that does not have to run small capacity and large boost, either requires a lot of cylinders or very large cylinders. Simple logic tells us that more cylinders can equate to big capacity with smaller cylinder sizes than fewer cylinders can. By doubling the rows of cylinders (2 rows per bank rather than 1) you can increase the number of cylinders without a proportional increase in overall dimensions of the motor. That is exactly what VW has done. I have to wonder if smaller capacity or fewer cylinders (V10 or V12) running boost could achieve the same result, why was it not done ages ago?
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08-10-2010, 12:36 PM | #60 | |||
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No idea - why don't you send him a memo and ask the question. |
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