Fuel consumption...

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Tinus lotz
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Re: Fuel consumption...

Post by Tinus lotz » 21 Jan 2012 12:56

Ek pomp my agterwiele tot 3 bar op harde pad en partykeer tot 0.6 vir regte sand
Die 4.8 is seker die beste sand masjien ooit die ooser ouens wil dit nie hoor of weet nie jy moet hulle maar net wys!!
Sit in lowrange en trap die petrol as jy nie aanloop het nie sit in derde of tweede en hou vas!!momentum en wiele wat draai is alles met die regte banddruk natuurlik
Kyk maar self en laat ons weet!!!! :mytwocents:

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Re: Fuel consumption...

Post by Adamastor » 29 Jan 2012 20:25

Hallo almal...

Het Saterdag 28 Januarie 2012 saam met 'n paar ouens by Atlantis gaan duine ry.
Het doelbewus nie probeer om brandstof te spaar nie - wou graag sien wat kan regtig onder uiterste omstandighede gebeur.

Gelukkig het die weer ook "saamgespeel" - dit was 'n snikhete dag en die temperatuur was op 'n stadium diep in die 30's.
Dus het ek die geleendheid gebruik om die lugversorger vir 95% van die dag te laat loop.
Om dit te kon doen, moes ek die enjin noodgedwonge heeldag laat loop.
Ons het so 55km teerpadlangs na die duine gery, so 4 of 5 uur lank gespeel en toe weer 55km teerpadlangs huistoe gery.
Die spelery het ook nie heeltemal so glad verloop nie, omdat ek my seun ook bietjie ryondervindig wou gee en dit het noodgedwonge heelwat probeer en weer probeer ingesluit.
Die enjin het ook 99% van die tyd geloop - selfs terwyl ons gestaan en wag het vir die ouens om die hindernisse te voltooi - in ander woorde amper 6 uur aaneen.

Tinus...
Jou rat keuse vir die 4.8 outomaties blyk in die kol te wees!
Het bietjie met 4 hoog en "drive" gespeel, maar uiteindelik het 4 hoog en 2de die ding teen die steiltes uit gedoen.
Bande was warm (na teerpad ry) afgeblaas na 0.9
Dankie.

Totale afstand 130.5km.
Brandstof verbruik 50.3l.
Dis so 2.58km/l
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Re: Fuel consumption...

Post by Herrie » 30 Jan 2012 12:53

Die laaste twee keer wat ek die Patol vol gemaak het by Total (net 93 by die garage en het gewoonlik op 95 gebly) het my brandstof verbruik heelwat verander!

Die verbruik was is die dorp gewoonlik tussen 4.1 en 4.6. Die laaste tenk se verbruik was 5.2 en die vorige een 5.4.

Wat maak nou die verskil? Die Total petrol of die 93 oktaan? :think:
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Re: Fuel consumption...

Post by davejones » 31 Jan 2012 18:01

David wrote:
2010-06-28 Camp Syncro - Puros.JPG
With everything on top including 4 Jerrycans and not towing anything I got the following consumption while doing 120 on the main roads...
km/l l/100km
4.50 22.25 Stellenbosch - Van Rynsdorp
4.27 23.44 Van Rynsdorp - Noordoewer
4.60 21.75 Noordoewer - Mariental
4.86 20.58 Mariental - Aranos - Gobabis
4.80 20.82 Gobabis - Waterberge - Otjivarongo
5.01 19.96 Otjivarongo - Kamanjab
5.31 18.83 Kamanjab - Opuwo
3.63 27.57 Opuwo - Okongwati - Van Zyl's Pas - Puros - Sesfontein
4.25 23.51 Sesfontein - Warmqelle - Swakopmund
4.68 21.35 Swakopmund
4.42 22.60 Swakopmund - Sossosvlei
4.65 21.52 Sossosvlei - Aus - Rosh Pinah
4.02 24.86 Rosh-Pinah - Sendelingsdrif - Alexanderbaai - Springbok
4.36 22.96 Springbok - Stellenbosch

stunning photo David - you shoulda entered this one into the competition :thumbup: :biggrin:
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Re: Fuel consumption...

Post by dieselfan » 02 Feb 2012 23:52

Herrie wrote:Die laaste twee keer wat ek die Patol vol gemaak het by Total (net 93 by die garage en het gewoonlik op 95 gebly) het my brandstof verbruik heelwat verander!

Die verbruik was is die dorp gewoonlik tussen 4.1 en 4.6. Die laaste tenk se verbruik was 5.2 en die vorige een 5.4.

Wat maak nou die verskil? Die Total petrol of die 93 oktaan? :think:
Many people feel 95 is for Turbo motors. As a matter of interest why was 95 not available in Jhb before, yet was at the coast?

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Re: Fuel consumption...

Post by Peter Connan » 03 Feb 2012 07:04

The octane rating is a measure of how resistant petrol is to pre-ignition.

The octane rating that an engine needs to run is a function of the maximum pressure and temperature the combustion mixture achieves when the pistons reach Top Dead Centre. This is dependent on the engine's compression ratio, the temperature in the combustion chamber, the temperature of the air going into the cylinder and the atmospheric air pressure.

This explains why you generally need a higher octane rating at the coast than at the highveld.

Engine designers keep using higher compression ratios, in a continuous search for better engine efficiency and as a result of materials that can better handle higher continuous temperatures, and this is why the octane ratings of the available fuels have to keep increasing every few years.
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Re: Fuel consumption...

Post by Alex Roux » 03 Feb 2012 09:04

Peter

How will this affect older engines in years to come?
If lower octane is not that freely avaialble anymore and we get forced to put higher octane in the engines that may not have been designed to take it.
How far can this upward rise in octane go?

Alex
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Re: Fuel consumption...

Post by Adamastor » 03 Feb 2012 09:27

I still remember the days before unleaded... it was 98 at the coast...
Then you had "union spirit" a Mobil product that was sort of like 102 or 108 octane... before the "nitro" days...
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Re: Fuel consumption...

Post by Peter Connan » 03 Feb 2012 09:54

Alex, there is no detriment to older engines running higher octane fuels than they need, only the other way around. So don't stress. The 4.2 Petrol engine in my car can (according to the manual) run right down to 88 octane.

The only disadvantage of higher octane fuels, is that they are more expensive.

The guys who race their cars mostly try and get their hands on AVGAS, which is (I think) also around 102-108 Octane, but some say it is a "dry"fuel, so they tend to add some lubricant to it.

Very modern engines can also sort-of run lower octanes than is ideal, because they have "knock sensors" which detect when pre-ignition occurs, and then the ICU retards the ignition timing, but this is not ideal. Under these conditions, the engine will produce substantially less power, but if this system were not present, substantial engine damage could result from using too low an octane rating.
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Re: Fuel consumption...

Post by KOOS BEST » 03 Feb 2012 10:01

Adamastor wrote: Totale afstand 130.5km.
Brandstof verbruik 50.3l.
Dis so 2.58km/l
Alle wereld, hoop jy het Arabier vrinne of baie aandele in SASOL :thumbdown:
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