You think? Explain in detail which parts you dont agree with and why. Try to use physics and logic. Calling something rubbish is not a valid argument.
You think? Explain in detail which parts you dont agree with and why. Try to use physics and logic. Calling something rubbish is not a valid argument.
Indeed. But there are still poor deluded folk out there who think that torque matters. Odd, isn't it.
Ian
As the more enlightened among us already know its torque x rpm that matters. Or rather power.
Really? Driving the 1.9TDI (130) passat estate over mixed A/B-roads and motorways, I averaged about 48mpg, and I don't exactly hang about. I'm surprised the 2.0TDI would be less economical. You must have much more lead in your shoe than me, or do a lot of town driving.
Anyway, whatever the case, the official figures for both petrol and diesel are given for the same test conditions, so even if they don't reflect real-world conditions, they probably still give a rough indication of the sort of proportional difference in economy you might expect between them.
Most drivers forget that all cars towing caravans are limited to 50m.p.h. on all normal roads, except on Motorways when they are permitted to do a dizzy
60 m.p.h.. We as caravanners don't like it and most seem to ignore it. So if you meet a caravanner doing 50, please write to your MP and ask him to raise the question with the appropriate government minister. I have a suspicion that normal A Road dual carriageways don't class as motorways and therefore caravanners are limited to 50. Am I correct, anyone?Jim
>
So you freely admit that you drive without even knowing the rules of the road for your vehicle?
Thanks for the useful link. Doesn't seem to cover motorcaravans . . . cheers Roger
RB News ( snipped-for-privacy@this.address.co.uk) gurgled happily, sounding much like they were saying :
Would you like your arse wiping for you as well?
- Cars and motorcycles (including car derived vans up to 2 tonnes maximum laden weight)
- Goods vehicles (not exceeding 7.5 tonnes maximum laden weight)
- Goods vehicles (exceeding 7.5 tonnes maximum laden weight)
I *presume* you know which of those weight categories your van falls into?
Well since we were talking entirely about *cars towing caravans* that's immaterial right now.
PC Paul ( snipped-for-privacy@bitrot.co.uk) gurgled happily, sounding much like they were saying :
And since it DOES, it's also immaterial.
The motorcaravanners just need to accept that they're driving a van with pretensions.
However, they would be covered as a 'car derived van' or a 'Goods vehicle up to 7.5 tonnes maximum laden weight'.
It did surprise me when I found out that a bog-standard Transit is limited to 50mph on single carriageway A-roads.
SteveH ( snipped-for-privacy@italiancar.co.uk) gurgled happily, sounding much like they were saying :
Surprise a lot of Transit drivers, too...
Actually, they're covered by the RTA as "dual purpose vehicles" - car speed limits.
But not if it's a motorcaravan.
Ian Dalziel ( snipped-for-privacy@lineone.net) gurgled happily, sounding much like they were saying :
Really?
I thought that was fairly explicit in what it covered - and I don't recall motorhomes being covered.
What size motorhome is covered by it?
Berlingo-camper?
3.5t Sprinter-conversion? 3.5t Ducato-cab-with-large-body? Winnebago?Ian Dalziel ( snipped-for-privacy@lineone.net) gurgled happily, sounding much like they were saying :
Ah. Looks like they're explicitly listed up to a certain unladen weight.
You are suggesting that power is not derived from torque, but you keep quoting the torque -v- r.p.m. conversion.
You're arguing that gearboxes do not transfer torque?
That's because it's not produced at a "rate", it's not that kind of quantity. The other examples you give are also not quantities that are produced at any rate, so are bad comparisons. Torque can actually be compared directly; think of a see-saw.
and hence have no idea what gearing needs to be employed.
Yes. Gears transmit (and amplify / reduce if needed) *torque*.
BOTH are required. You cant have one without the other unless stationary.
They multiply it or divide it.
Only if you are not moving! At which point it becomes totally academic! Once you move at all the torque reduction/multiplication caused by the required gearbox at any given roadspeed means the same torque is produced at the wheel regardless of weather you use a 200 bhp bike or truck motor. So the only meaningful measurement that can be compared usefully is power.
Meaningless. Gears 'transmit' both torque and power, but the conserved quantity, regardless of gearing, is *power*. Power is the more fundamental physical quantity.
In message , Jerry writes
Literally, yes, but without factoring in RPM it's meaningless. With RPM, we're talking about power. And the torque *at* *the* *wheels* available at any given road speed is a function of power and gearing, not of torque at the flywheel [0].
The graph above shows that the engine with more power and less torque at low revs gives more torque at the wheels in every gear, whatever the road speed. So how is "low down torque" relevant?
[0] Of course in one gear torque at the wheels is directly proportional to torque at the flywheel. I'm talking about torque at the wheels available to the car's engineer, which can be manipulated by choice of gearing but is constrained by power output, not by the absolute value of torque independent of rpm.MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.