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Message: <blockquote data-quote="shiroitenshi" data-source="post: 2143832" data-attributes="member: 27518">This is not noobie questionlah moshpit.. Okay, for starters, this is a bit of a gray area for me.. I think I know, but I cannot say that it's a 100% sure thing.. There are many variables that affect knock resistance, so I won't go into that.. since I'm still learning those stuff.The RON number is something that ranks how much the fuel resist autoigniton (something like detonation).. Many standards depending on how ppl test the fuel or calculate... some are MON, and PON (PON is the usual US rating.., that's why you see their fuel rating is lower)If you want a clearer idea, I think you can google up sources for it.. I give simple version (as I see it lah)The higher your engine compression means how much your engine compress the air. If 10:1, means that 10cc is compressed to the space of 1cc before it's ignited by the spark plug. In a B16A, one cylinder roughly pushes something less than 400 cc into the space of something less than 40cc (That's where you get the 10.5 CR on B16A)One thing about doing that is that the air+fuel heats up by a lot when compressed... and if given a low octane fuel, it will ignite without needing a spark from the spark plug.. This is what causes the detonation/knocking you always hear about. So one way is for tuners is to tweak the ignition timing so that it fires just before the fuel and air auto-ignite. This prevent's the detonation from happening, but also decreases power if went to the extremes. Too much igntion advance is also similar, because the fuel air mix did not result in peak combustion chamber pressure just before the piston starts going down it's stroke (That's how power is generated in engines.) so to achieve that, we need higher compression, so the peak combustion chamber pressure is reached faster, and higher too. It also can result in knock, if the fuel + air mixture autoignites before the spark plug fires.So you can use 92ron on your B16a, if you detune the ignition and accept the lesser power output.. but that's a step backwards isn't it?The B16A is recommended to run on premium fuels like the 97RON (I think the requirements was like maybe 95 RON? (anyone has the original fuel tank cover sticker to be sure?)</blockquote>

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