I have some questions, I'm no engineer in mechanical field and I only have a general idea on how an engine works so correct me if I'm wrong

Question: does higher RON allows for higher performance in normal car? Eg myvi saga

Fact: A higher RON allows for a higher compression ratio without knocking

Doubt: to mechanical engineers, does a normal car engine adjust it's own compression ratio to the fuel octane ratio? If it's not variable then wouldn't it compress the fuel back to the same ratio? Then wouldn't the performance be the same between RON 95 and RON97 if the compression ratio is the same?



This post has been edited by destEX: Dec 4 2014, 08:45 AM

The compression ration between RON95 and RON97 is different. RON97 can hadle more pressure thus when combust release more energy, that's all about it. Most of the time you can't feel the difference, except when you paying for your fuel. Just use whatever fuel recommended for your particular car model.

inkambing ENGr. Uitm

This post has been edited by chokia: Dec 4 2014, 08:39 AM

Mahal = Bagus....

V-POWER Racing lagi mahal = lagi bagus

Yes ron97 can handle more pressure but who puts the pressuee? The engine right? Then the compression ratio is determined by the engine, so back to my main question, is the engine compression ratio variable for normal msia cars

Petrol halal > all

Inb4 minyak pelincir halal and minyak pelincir perisa babi

Eversince i used RON97 everyday i reach office early altho i go out late. RON97 can make your car reach places faster

100% success beating traffic light guranteed

Question: does higher RON allows for higher performance in normal car? Eg myvi saga

yes, if your saga got knock sensor, which is the sensor for detecting the fuel quality.

correct me if i'm wrong

The answer is yes, depends on the type of the engine. But i would not recommend to adjust the compression ratio though..

The difference in octane generally indicates the resistance to detonation. It has nothing to do with compression ratio. So throw the idea of the compression ratio out the window.

A car mostly cannot change its compression ratio, but it can advance or retard the ignition. It does this in concert with the O2 sensor for AFR and knock sensor.

eg; If a car senses it is using a lower RON than what is recommended due to the detection of knock and pinging via the knock sensor it starts to retard timing, which lowers the power. And if it detects that knock is 0 and AFR meets the target it gets more aggressive with the timing advance.

But, no. On normal cars, the car will go no more aggressive on the timing than it's stated RON target. If your car maker recommends a RON91 you gain nothing by going to 98 as the ECU will go no higher to preserve the engine from blowing holes in your piston.

Ron 97 less knocking tendency. Most modern engine can take advantage of that with more advanced timing hence producing more power.

This would be more accurate answer. So no need to get different RON for you car, just use whatever recommended by the manufacturer

konklusi disini.. ron 95 nor ron97. dua2 xde beza.

and myth pasal ron97 cuci enjin tu? owai. aku dengar pon dah topkek

Ayam chemical engr

Anyway just pass by

Good

If you own a performance car with a wide range of recommendations, then yes, you can try different fuels.

My Mitsu Evo in the manual says that it will run on 95 to 98, so maximum power is achieved at RON98.
My BMW says it will run on 91 to 98, so being a cheap bahgger I isi with cheapo petrol RON91 to jimat.

Under law, all fuel contains a certain amount of detergents. Some fuel sellers to increase sales put more additive in their premium RON97 petrols, but not all of them.

Also if you use a direct injection engine, all this cleaning shit is useless.

ouh wel.. now the price range not too far.. it should consider cheap.

How can I know my car sapot what petrol?

Proton information so limited on internet.

dont really care bout the more mileage or more power or more fast...
i using ron97 due to more safe for engine je...hopefully.

ingeniur here

still pumping ron95

ron97 more value for money? even for myvi/saga/wira? nah