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Originally Posted by p nut
I'm saying that you CAN use it in an Si. It is RECOMMENDED that you use premium, but doesn't mean the end of the world if you choose 85. What makes you think that you can't? Most modern engines have knock sensors that automatically retard timing, so it's not going to blow up your engine if you use it.
The MDX has the same fuel recommendation.
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It would really help you if you just READ a little.
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Originally Posted by soxfan143
Octane is directly related to burn efficiency. The lower the octane the easier the fuel will ignite under pressure and possibly ignite prematurely. Premature ignition as also known as the dreaded knock. Now with a high compression motor like the Si the compression in the chamber on the compression stroke is way too much for 87 octane fuel. And with the high ignition timing this car runs on, the 87 octane gas is a recipe for disaster. You WILL get detonation from this. You might not hear it and the knock sensor will retard timing enough for you not to cause significant damage. But I would not run 87 octane ever in this car.
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Quote:
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Originally Posted by soxfan143
Do you even know how bad that ping-klang-tik-tik is for your motor? The pistins are trying to be spun backwards. The fuel is igniting while the piston is on it's way up on the compression stroke. This will cause serious problems. Like bent rods and broken pistons. So please don't make it out to be OK to use cheap gas in this car. Or there will be a lot of unhappy owners at the dealers with voided warranty claims when they test the fuel and find out it was run on 87 octane and the motor is rubbish.
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