Care credeti ca este benzinaria cu cel mai bun carburant ?

[GXG Find all posts View Profile Close GXG]

Eu in continuare bag efix, si nu a mai dat nici o data antipolution si nu mai scoate fum. Deci...... Apropos de servire, eu client OMV ma tot lovesc la rompetrol de faptul ca intotdeauna pompa oti curge ori e murdara de motorina si nu au pe cineva sa-mi verifice presiunea si sa spele parbrizul. Eu intotdeauna lasam 2RON baiatului, deci cred ca problema platii nu prea se pune.

[Duyu Find all posts View Profile Close Duyu]

De cand mi-am achizitionat masina merg pe mana OMV-ului, numai motorina euro 5. (premium diesel euro 5, sau mai nou pe timp de iarna, cea importata din Austria, alpine diesel, tot euro 5). Pana acum nici o problema din cauza carburantului.

[Val S Find all posts View Profile Close Val S]

Mai oameni buni, fiti seriosi, ce masuratori sa faca, stiti cumva cat timp, bani si carburant este necesar pentru a face "de-adevaratelea" teste cu carburantul aditivat? Parerea mea este ca acel aditiv care se pune in carrburant in depozite are generic un caracter detergent pentru supape si injectoare. In rest nu cred ca a facut cineva teste cu temperatura de ardere, forma flacarii in cilindru, etc
Cereti o informatie detaliata de la RAR - OCP despre metodologia de testare si mai vedem.
Sa fim seriosi, este marketing 100%.

[BeeJay Find all posts View Profile Close BeeJay]

Pe langa faptul ca e marketing e si prosteala pe fata: puteti sa puneti si combustibil de curse; efectul va fi sesizabil doar pentru cei care au motoare peste 2000 cmc.

[75NOR Find all posts View Profile Close 75NOR]

completare la BeeJay: motoare peste 2000 si un raport de compresie suficient de mare ca motorul sa poata valorifica o benzina cu CO mai mare si proprietati calorice imbunatatie.

Concluzie: daca nu aveti cel putin 2.0 si 177 de cai (mot de 206 RC si 307) puteti sa puneti si mama benzinelor ca fix la fel va merge motorul

[AIR Find all posts View Profile Close AIR]

Aici te contrazic norule, deosebirea se simte dar nu asa de mult cat ne-am dori noi, poate doar cu alti combustibili.Una e sa mergi cu un carburant care iti pune masina in nas, si alta problema e cu un carburant bun care te ajuta in depasire uneori nemaifiind nevoie sa retrogradezi pana in a 3 a
Personal consider ca nu are sens sa da-i bani in plus pe acelasi produs.
Uitati-va la petrom.ro si veti vedea ca top euro4=sprint diesel, si asa mai departe.
Am pus intr-o vreme benzina fara Pb de la OMV (pe atunci era doar de 95),dar am pus aproape un an de zile.Stiam dupa nivelul la ac cati litri intra.Intrau mereu la fel 36de litri.Apoi a aparut Rompetrol si am pus de la ei acul arata identic la Rompetrol nu intrau decat 32 litri.Am verificat la mai multe statii cand acul arata la aceeasi pozitie.(pe vremea aceea masina consuma aproape la fel de la plin la plin (8.5-8.6))
Deci m-am cam suparat pe OMV, am pus ulterior tot de la Omv cu acul la benzina in aceeasi pozitie la ei (indiferent de statie intrau 36 litri) o remarca mereu o umpleam pana sus sa se vada benzina.Deci nu ma luam dupa saritul pistolului.
La petrom am trecut ulterior, pt ca am observat ca benzina de la OMV si MOL iti tine motorul parca mai viu (merge mai rotund si urca mai usor in ture) dar mai ales la drum lung se consuma mai repede.:naughty:
Cea de la petrom si mai ales Top 99 au randament mai mare am scos cele mai mici consumuri cu ele.
Buna mi s-a parut si benzina de 98 de la Lukoil.
Cea de la rompetrol 98 am incercat dar nu am simtit nici o diferenta fata de 95 tot a lor.
Deocamdata am pus doar efix diesel de la rompetrol, merge bine masina si mai trebuie sa treaca un timp sa ne obisnuim reciproc unul cu celalalt :naughty:
Si cand am iesit din tara dupa 2000 nu am remarcat aproape nici o deosebire intre benzina din tara si cea din germania sau austria, e drept ca nu am pus Optimax de la Shell care era mai scumpa decat celelalte, dar in rest am pus superplus bleifrei (98) si nu am simtit ca masina mergea muult mai bine decat in tara sau decat acolo cu benzina de 95. (nu vorbesc de autostrazi:naughty: )
Momentan voi pune benzina sau motorina de unde consider ca este mai ieftin dar cu o calitate mai buna cel mai bun raport la benzina ramane top 99 de la petrom cu 34700 mai ieftin decat 36000 de la rompetrol (98)
Cu motorina nu ma pronunt inca pt ca nu am experienta:naughty:
Dar in timp sunt hotarat sa incerc tot si Lukoil, SI Mol, si OMV, Agip, sau Petrom, Rompetrol deja am pus

[kik Find all posts View Profile Close kik]

Hei nor de ce nu pui de la petrom daca ie toate la fel??

[BeeJay Find all posts View Profile Close BeeJay]

Am pus benzina de la toate benzinariile. Faptul ca am pus odata in Dacie benzina de la Petrom si a inghetat returul m-a determinat sa nu mai alimentez niciodata de acolo. In rest n-am observat nici cea mai mica diferenta. Motorul nu a tras niciodata nici mai bine, nici mai prost. Intr-un post anterior am explicat cum au aparut marcile de combustibil de genul "Alpine Diesel", "MOL EVO", etc. La unele statii se pot gasi combustibili cu impuritati sau "botezati" dar asta e altceva. Faptul ca banii dati pe combustibili scumpi sunt bani aruncati, mi-a fost confirmat de un articol pe care l-am citit cu ceva timp in urma. Era vorba de un test cu mai multe masini cu motoare de capacitati diferite si mai multe tipuri de combustibili. Acolo am aflat ca degeaba pui benzina de rally intr-un motor de capacitate mica pentru ca pur si simplu puterea sau cuplul motorului nu creste. Masuratorile nu erau facute dupa ureche ci pe stand. Din cate stiu cea mai buna benzina era una de la Shell, dar, repet, imbunatatirea s-a simtit dupa 2000 de cmc.

[BeeJay Find all posts View Profile Close BeeJay]

Mixtura aer-combustibil poate autodetona in anumite conditii, conditii care se regasesc din plin in camera de ardere. Prin urmare in combustibili se adauga alti compusi chimici pentru a putea controla arderea. Acesti compusi chimici dau cifra octanica si cu cat cifra octanica e mai mare, cu atat combustibilul va suporta compresii mai mari fara a detona. Deoarece masinile de competitie au motoare cu rapoarte de compresie ridicata se foloseste benzina cu cifra octanica mai mare. Benzina cu cifra octanica mare pusa in motoarele noastre nu aduc nici cea mai mica imbunatatire in privinta performantei dar cifra octanica mai mica decat cea recomandata de producator dauneaza grav motorului.
Atentie: cifra octanica difera in functie de altitudine. Daca la Constanta cifra octanica a benzinei este 95, la Brasov ea va fi de 94, la Poiana Brasov va fi 93,5 iar la Balea va fi de 91. La fiecare 300m altitudine cifra ocatanica scade cu 0,5.

[silverbullet Find all posts View Profile Close silverbullet]

Atentie: cifra octanica difera in functie de altitudine. Daca la Constanta cifra octanica a benzinei este 95, la Brasov ea va fi de 94, la Poiana Brasov va fi 93,5 iar la Balea va fi de 91. La fiecare 300m altitudine cifra ocatanica scade cu 0,5.

Poti explica chestia asta?

[75NOR Find all posts View Profile Close 75NOR]

@kik: vroiam sa zic ca intre benzinele bune gen OMV 95, 100, Rompetrol 95, 98, NU se simte absolut nici o diferenta daca nu ai un motor high performance.

De la omv si petrom refuz sa alimentez. Unii sunt de mentalitate comunista, altii sunt niste plictisiti.

Alimentez doar Rompetrol, caci pe langa benzina ofera si servicii care mie imi plac.

LuKoil, Mol si altii nici nu intra in discutie. Datorita jobului am ajuns sa cunosc binisor oameni de decizie si de la LuKoil si Mol. La ce degringolada e la ei si ce probleme au cu furnizorii, sub nici o forma nu-mi inspira incredere carburantii lor.

[a_mic Find all posts View Profile Close a_mic]

ia zi, prietene BeeJay, ca nu stiu cum vine treaba. Cifra octanica, dupa stiinta mea, e data de continutul de izooctani al benzinei, respectiv: o benzina de 90 are 90% izooctani. Acesta este motivul pentru care cifra octanica a unei benzine nu poate depasi 100. Pentru benzinele non-euro, adaosul de tetraetil de plumb creste capacitatea de detonatie fara a utiliza intr-o proportie mai mare izooctanii, iar pentru benzinele de tip euro, capacitatea de detonatie creste prin cresterea continutului de izooctani. Motivul abandonarii tetraetilului de plumb il constituie gradul ridicat de poluare cu plumb dar, in contrapartida, pentru a obtine benzine superioare trebuie sa cresc continutul de izo8. Eu stiu ca cifra octanica nu poate sa scada cu altitudinea din cauza faptului ca aceasta nu afecteaza continutul de izo8. Intr-adevar, cu altitudinea ar trebui sa scada detonatia din cauza amestecului din care partea de oxigen scade cu altitudinea.

[AIR Find all posts View Profile Close AIR]

Aici intra in functiune senzorul de presiune atmosferica din computerul de gestiune a motorului.Nu stiu exact daca mareste avansul sau ce face exact in orice caz nu te lasa cu ochii in soare, cand ai de urcat pante accentuate.E important ca sa nu scada cantitatea de oxigen dat faptului ca aerul e mai rarefiat si mai sarac in oxigen.
Stiu ca OT dar e in legatura cu ce scrie in posturile anterioare.

[BeeJay Find all posts View Profile Close BeeJay]

Exista benzina cu cifra octanica mai mare de 100. Asta stiu sigur. Cum se masoara puteti citi mai jos. Nu mai traduc pentru ca oricum chimia am urat-o in scoala.

"Octane ratings - how to stop detonation

So you know that a fuel-air mix, given the right conditions, can spontaneously combust. In order to control this property, all petrols have chemicals mixed in with them to control how quickly the fuel burns. This is known as the octane rating of the fuel. The higher the rating, the slower and more controlled the fuel burns.
Put on the geek-shades for a moment and I'll explain octane in more depth. If you don't like being blinded by science, skip down a few paragraphs. For the rest of you, octane is measured relative to a mixture of isooctane (2,2,4-trimethylpentane, an isomer of octane) and n-heptane. An 87-octane gasoline has the same knock resistance as a mixture of 87% isooctane and 13% n-heptane. The octane value of a fuel used to be controlled by the amount of tetraethyl lead in it, but in the 70s and 80s when it became apparent that lead was pretty harmful, lead-free petrol appeared and other substances were introduced to control octane instead.
Measuring octane - RON, MON and the difference between America and the rest of the world.

Just so you know, the octane number is actually an imprecise measure of the maximum compression ratio at which a particular fuel can be burned in an engine without detonation. There are actually two numbers - RON (Research octane number) and MON (Motor Octane Number). The RON simulates fuel performance under low severity engine operation. The MON simulates more severe operation that might be incurred at high speed or high load and can be as much as 10 points lower than the RON. In Europe, what you'll see on the petrol pumps is the RON. However, in America, what you'll see on the petrol pump is usually the "mean" octane number - notified as (R+M)/2 - the average of both the RON and MON. This is why there is an apparent discrepancy between the octane values of petrol in America versus the rest of the world. Euro95 unleaded in Europe is 95 octane but it's the equivalent of American (R+M)/2 89 octane.
In America, low altitude petrol stations typically sell three grades of petrol with octane ratings of 87, 89 and 91. High altitude stations typically also sell three grades, but with lower values - 85, 87 and 89.
What factors affect detonation?

There's a bunch of things that can affect how likely an engine is to have detonation problems. The common ones are ambient air temperature, humidity, altitude, your engine's ability to stay cool (ie. the cooling system) and spark timing. Fortunately, nowadays the engine management system of modern cars can compensate for almost all of these by advancing and retarding the ignition timing. This is where the computer slightly adjusts the point in the ignition cycle at which the spark is generated at the spark plug. With older engines that used mechanical points to send current to the spark plugs, adjusting the timing was a manual affair that involved adjusting the distributor cap orientation.
Knock sensors. Most modern cars have knock sensors screwed into the engine at multiple places. These actually detect the vibration or shock caused by detonation (rather than trying to detect the sound) and can signal the engine management system to change the ignition timing to reduce or eliminate the problem.
Octane and altitude

The higher the altitude above sea level, the lower the octane requirement. As a general rule of thumb, for every 300m or 1000ft above sea level, the RON value can go down by about 0.5. For example an 85 octane fuel in Denver will have about the same characteristics as an 87 octane fuel on the coast in Los Angeles. As a practical example of this, I currently live in Salt Lake City which is at around 4,200ft. We travel to Las Vegas from time to time which is at around 2,000ft. Our Subaru has a minimum octane requirement of 89 at sea level - so about 87 where we live. Last time we drove to Vegas, the petrol station we stopped at had run out of 'premium' products so we had to fill up with 85 octane. This, combined with the drop in altitude caused the 'check engine' light to come on because we'd effectively taken the engine from 87 octane at altitude to the equivalent of 83 octane at altitude - way below the minimum required by our car.
Octane and power

It's a common misconception amongst car enthusiasts that higher octane = more power. This is simply not true. The myth arose because of sportier vehicles requiring higher octane fuels. Without understanding why, a certain section of the car subculture decided that this was because higher octane petrol meant higher power.
The reality of the situation is a little different. Power is limited by the maximum amount of fuel-air mixture that can be jammed into the combustion chamber. Because high performance engines operate with high compression ratios they are more likely to suffer from detonation and so to compensate, they need a higher octane fuel to control the burn. So yes, sports cars do need high octane fuel, but it's not because the octane rating is somehow giving more power. It's because it's required because the engine develops more power because of its design.
There is a direct correlation between the compression ratio of an engine and its fuel octane requirements. The following table is a rough guide to octane values per engine compression ratio for a carburettor engine without engine management. For modern fuel-injected cars with advanced engine management systems, these values are lowered by about 5 to 7 points.
Compression ratio Octane
5:1 72
6:1 81
7:1 87
8:1 92
9:1 96
10:1 100
11:1 104
12:1 108
Octane and gas mileage

Here's a good question : can octane affect gas mileage. The short answer is absolutely, yes it can, but not for the reasons you might think. The octane value of a fuel itself has nothing to do with how much potential energy the fuel has, or how cleanly or efficiently it burns. All it does is control the burn. However, if you're running with a petrol that isn't the octane rating recommended for your car, you could lose gas mileage. Why? Lets say your manufacturers handbook recommends that you run 87 octane fuel in your car but you fill it with 85 instead, trying to save some money on filling up. Your car will still work just fine because the engine management system will be detecting knock and retarding the ignition timing to compensate. And that's the key. By changing the ignition timing, you could be losing efficiency in the engine, which could translate into worse gas mileage. Again as a practical example, my little tale above about our trip to Vegas on low octane gas. (Whether you want to believe some bloke on the internet or not is up to you). On the low octane gas on the trip down, we could barely get 23.5mpg out of the Subaru. Once I was able to fill it up again with premium at the recommended octane rating, we got 27.9mpg on the way back. A difference of 4.4mpg over 450 miles of driving.
Doing the maths, you can figure out that by skimping on the price during fill-up, you may save a little money right there and then, but it costs in the long term because you're going to be filling up more often to do the same mileage. My advice? Do what the handbook tells you. After all it's in the manufacturers better interests that you get the most performance out of your car as you can - they don't want you badmouthing them, and in this day and age of instant internet gratification, you can bad-mouth a large company very quickly and get a lot of publicity. "

[a_mic Find all posts View Profile Close a_mic]

"Masurarea cifrei octanice - RON, MON si diferentele intre America si restul lumii.

Asa cum stiti, cifra octanica este in prezent o masura aproximativa a ratei maxime de comprimare prin care un combustibil de un anumit tip poate arde intr-un motor fara detonare. Sunt utilizate in prezent doua cifre: RON (cifra octanica de "cercetare" (???) ) si MON (cifra octanica motor). RON simuleaza performantele combustibilului in functionarea "lejera" a motorului. MON simuleaza functionarea in conditii mai severe induse de viteze sau incarcari masice mari si poate fi cu 10 unitati mai mica decat RON. In Europa, cifra afisata la pompa este RON. Ceea ce vedeti In America la pompa ca fiind cifra octanica este o valoare mediata - notata (RON+MON)/2. Acesta este motivul aparentei diferente intre cifrele octanice din America fata de restul lumii. Euro95 fara plumb in Europa este octanic 95 dar, echivalentul ei in America este octanic 89.
In America, in mod obisnuit, statiile de alimentare situate la altitudini joase afiseaza cifre octanice de 87, 89 si 91. Statiile de la altitudini mari afiseaza in mod uzual tot trei categorii dar, cu cifre octanice mai mici, respectiv 85, 87 si 89".

@BeeJay: cred ca poti creste cifra peste 100 doar daca folosesti izo8 in proportie de 100% si adaugi tetraetil de plumb.
Traducerea am facut-o din placere si ca sa inteleg mai bine ce scrie in articol. Este interesant dar, americanii au fost mereu mai suciti: mila, uncie, leghe, picior, unghiuri centesimale, Fahrenheit,...