breakdown now Natural Speed and fuel economy

G

Guest

Guest
When you have travelled in 4 hours in 45 series or 80 series Troopie at
100kph / 60mph over crushed limestone / dolomite roads with huge washboard
sections as the driver completes just another of his daily journeys, 80mph
up a motorway seems reasonable =96 left at home in the garage fuel consumption
becomes none per year and the vehicle will last ages.

All that said, Fred you are right that cars have there own natural speed, or
you were right, modern cars seem a little different, other than fuel
consumption it would be hard for me to say if my Chrysler Crossfire is
happier at 50, 60, 70, 80, or 100 mph, and I think a blindfold passenger on
the motorway would struggle to say which speed was which.

If my maths are right the difference between 70mph and 80mph in wind
resistance is 80/70 squared or 1.14^2 =3D 1.3 ie travelling at 80mph 14%
faster requires 30% more effort to overcome the air resistance? (Drag is a
square rule, double the speed means four times the drag), 90 as opposed to
70 is 28% faster and requires 65% more effort.

I can see a demand to drop the speed limit (just as we have cars and roads
capable of allowing us to safely travel faster), on the gounds of fuel
economy, drop the speed limit from 70 to 60, inforce it and we would have a
huge drop in fuel consumption and emissions. Probably wouldn=92t slow traffic
as much as one might think, most traffic is only travelling at 80mph to get
to the queues quicker and the slower we go the less people can complain
about 4x4=92s (apart from the daft argument that they take up more road!)
Main thing is an increase in speed limits is not likely as the reverse
argument applies.

Might all seem improbable but I seem to recollect New Zealand running a
scheme (years ago) where you could only use you car on particular days of
the week depending on what sticker you had in the window. (also once all
Motorway traffic is 60mp or slower I won=92t look so silly in a 45 series at
60mph.


Malcolm Bagley
Stafford, UK
1975 FJ45 Pickup (In Work)
_______________________________


_____
From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of FREDERICK AULD
Sent: 20 August 2006 10:06
To: [Email address removed]
Subject: Re: [ELCO] breakdown

Landcruisers, like any car, have their own 'natural' cruising speed... and
for me it's not above 70mph. It may be revving in the mid-2000s which might
look ok compared to a 4 cyl hatchback, but that's not really the way to
assess suitable cruising speed. The other indicator of a cruising speed
that will ensure long vehicle life is mpg... on the TLC, mpg falls away
rapidly after 70mph, which means the engine is working hard to overcome air
drag. Certainly, if you plan to keep the vehicle indefinitely (or forever),
then high speed is a killer in the long term. There are many stories of 1
million mile cars, and their owners will always tell you that moderate speed
(and frequent oil changes) were the secret of success. What's more, if you
ease up, then you get to spend more time behind the wheel enjoying your
cruiser. Cheers. Fred.
----- Original Message ----
From: John Byrne <[Email address removed]>
To: [Email address removed]
Sent: Sunday, 20 August, 2006 12:48:59 AM
Subject: Re: [ELCO] breakdown
Hey Frederick
It maybe a 92 but it has had more new parts than maybe its value on the
market, including an engine rebuild and fuel pump rebuild.
I think it cruises at the 80mph very nicely usually that is and dont think
it is trashing it one bit.
I think a low geared JCB is for moving slowly over rough terrain as should
the cruiser in the same situation.
But it is a top of its class road vehicle aswell and will only be in the mid
2000 revs while doing 80mph.
Also a good run is supposed to purge the engine of all the impurities that
acumilate from slow driving most of the time.
Its very well looked after and if the constant driving on a motor way at 80
mph for about 25 miles is too much for the king of 4x4s to handle.
cheers
john 92HDJ 80 1HDT
----- Original Message -----
From: HYPERLINK "mailto:[Email address removed]"
FREDERICK AULD To: HYPERLINK "mailto:[Email address removed]" [Email address removed]
Sent: Sunday, August 20, 2006 12:15 AM
Subject: Re: [ELCO] breakdown

Why me ? Because these vehicles are not designed for thrashing along at
80mph on motorways. Eventually something will break at that pace,
especially if you have a few miles up.. it's a 92 for xxxx sake. Look after
it, and it will look after you.. These cruisers are designed for crawling
over rough terrain. Big tyres, lots of linkages in the drive-train,
all-wheel drive, low revving diesel.... how do you figure that a constant
80mph is looking after it ?
----- Original Message ----
From: John Byrne <[Email address removed]>
To: [Email address removed]
Sent: Saturday, 19 August, 2006 9:56:24 PM
Subject: Re: [ELCO] breakdown
Hey Peter
Thanks, I am at the stage of random thoughts and a lot of other thoughts like why me again, when i take such good care of it. Just goes to show you
there are the lucky people who dont care about what they drive and drive all
the time without problem and then there are people like me who care and look
after the vehiicle and get a lot of hassle. Dont figure at all.
cheeers
john 92HDJ 80 1HDT
--
European Land Cruiser Owners Mailing List
Further Info: HYPERLINK "http://www.landcruisers.info/lists/"

http://www.landcruisers.info/lists/

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G

Guest

Guest
> Might all seem improbable but I seem to recollect New Zealand
> running a scheme (years ago) where you could only use you car on
> particular days of the week depending on what sticker you had in
> the window. (also once all Motorway traffic is 60mp or slower I
> won=92t look so silly in a 45 series at 60mph.
Did they? Must have been after my time. They do that in Singapore
though. Quite sensible.
 
G

Guest

Guest
Hi Darren,
A system such as this, called dactylos, was used in Athens when I was
living there. The reason was to limit polution during summer months.
--
Rgds,
Roman (London, UK)
'92 HDJ80
On 8/21/06, [Email address removed] <[Email address removed]> wrote:
 
G

Guest

Guest
Hello guys
I think Frederic reads to much into the "natural" aspect of motoring.
which by it's own nature is not natural at all :) You torment your
ass to kep your legs still while moving.
Get a few rattling bits on the dashboard, a roofrack howling in the
wind, big noisy tyres and you will find that 50 mph seems to be more
"natural" than 70mph. I have a Landrover Series III for which even
30mph seems like a mind boggling speed.
At 3000 rpm the 1HD-T works well within it's capacity.
Sorry, but it's a bit simplistic. Air drag is casued by more things
than speed, mpg indicates how much of your hard earned money will be
converted into Gordon Brown's liquid assets, and mph is just a
measure how late you are going to be for the meeting. There are more
important measurable factors that wil tell you how hard the engine is
working, for example EGT, water temperature, etc.
Sure, we know of pristine classic cars that are 50 years old that have
spend most of their lives travelling at 0 mph. That really works
wonders for the engine. For more practial applications cars tend to be
used moving at varyng degrees of speed. Prolonged constant speed,
either low or high, has killed more engines.
For many of us there may be little point in keeping the same engine
forever if it can replaced or overhauled when it's no longer
economical to run it. What we gain is more time to enjoy between
travels.
--
Rgds,
Roman (London, UK)
'92 HDJ80
 
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