Octane rating

[userfriendly]

Bakit masmataas ang octane rating sa Pinas kumpera sa US at Canada? Sa US at Canada, ang regular ay 87 octane, 90 yung mid level at 93 yung high octane. Pero sa Pinas, 93, 95 at may 96 pa yata.

Magkaiba ba ang standard o ang method of rating? Kasi di ba masmadumi yung gasolina natin?

[the_wildthing]

Magkaiba ang method ng computation. Nakalagay sa gas pump sa US kung ano yung method, di ko na lang maala-ala.

[yebo]

also, US spec cars have lower compression ratios (due to strict anti-pollution laws, less NOx on low compression engines) and do not require higher octane gasoline. to compensate for the lower compression ratios their engines have bigger displacements.

the philippines have taxation laws that apply higher taxes on bigger displacement engines. thus vehicles in the philippines have higher compression ratios to squeeze more horsepower from smaller engines. higher compression ratios require higher octane gasoline.

[boybi]

also, US spec cars have lower compression ratios (due to strict anti-pollution laws, less NOx on low compression engines) and do not require higher octane gasoline. to compensate for the lower compression ratios their engines have bigger displacements.

the philippines have taxation laws that apply higher taxes on bigger displacement engines. thus vehicles in the philippines have higher compression ratios to squeeze more horsepower from smaller engines. higher compression ratios require higher octane gasoline.

kaya pala minsan iba yung power output ng locally sold cars compared sa ibang countries. akala ko linoloko lang tayo ng car manufacturers.

[n2knee]

kaya magkaiba ang octane rating sa USA, Europe, at Asia ay:

sa USA/Canada, ang rating ay yung average ng RON (Research Octane Number) and MON (Motor Octane Number) = AKI. halimbawa ang unleaded fuel ay may rating na 97 (RON) at 87 (MON) ay magiging 92 (AKI) dito sa USA (97+87=184/2=92).

sa Europe at Asia ay RON gamit na pangrating sa mga gasolina.

[3ple4]

May 87 octane rating sa Metroil gas station sa Bocaue, Bulacan.

[ryan]

Among our local fuel variants, which one has highest octane rating? Is it Blaze?

[squala]

Ryan, SeaOil has 98 octane AFAIK, but really doubt it's better than what Shell and Petron have to offer.

[redorange]

also, US spec cars have lower compression ratios (due to strict anti-pollution laws, less NOx on low compression engines) and do not require higher octane gasoline. to compensate for the lower compression ratios their engines have bigger displacements.

the philippines have taxation laws that apply higher taxes on bigger displacement engines. thus vehicles in the philippines have higher compression ratios to squeeze more horsepower from smaller engines. higher compression ratios require higher octane gasoline.

That was true in the 70's and 80's but now it's no longer the case w/ regard to compression ratios. The C6 Corvette w/LS2 engine has a 10.9:1, Honda Civic Si w/ K series engine 11:1, Nissan VQ engine has 10.3:1, Toyota 2ZZ-GE engine 11.5:1, 1ZZ-FE engine 10:1. So as you can see we have more than our share high compression engines, we get big displacement because we like torque and you can't get that with a 1.5L engine and we drive longer distances at faster speeds which is not fun when you have a small engine. As far as taxes on big engines we have that also it's called a gas guzzler tax and pollution laws allow us to breathe our air instead of bumping into it like in Metro Manila w/ the smog.

BTW were I live 87 octane gas is now +/-$3.30 a gallon which is about $.87 per liter or P45.24 * a conservative P52:$1 exchange rate. You can add about 40 to 50 cent for 91 octane. Last I checked RP unleaded gas prices were P40.79 to 43.06 per liter and we don't get told in advance when gas prices will go up they just go up sometimes while you are putting gas on your car as has happened to me more than once. We are already hearing talks of gas at the $4 range by next year.

[niky]

Philippine RON ratings can be roughly translated as follows:

92-93 RON - 87 Octane, US (AKI)

95 RON - 92 AKI

96-98 RON - 93-95 AKI?

Of course, with different blends and additives, these aren't exact conversions. But it should be close.

Is Seaoil's 98 Octane the ethanol blend? If it is, it doesn't give quite the power of true 98 RON, I think. Ethanol is an octane booster.