Choosing a fuel oil with a Compression Ratio Engine

Car and motorcycle engines require fuel types in accordance with the design of the machine itself in order to work properly and produce optimal performance. Type of gasoline is usually represented by a number / value of octane (RON), for example, air-Premium 88 octane, 92 octane PERTAMAX air and so on. The higher the octane number, the price per liter was generally higher. But not necessarily that if the air-filled, high-octane gasoline in automobile engines / motors us, then will result in a higher power as well. If we look at the specifications of our vehicle (car or motorcycle) on good brochure will feature information compression ratio (Compression Ratio / CR). CR is the result of pressure ratio calculation relating to the volume of the combustion chamber against the piston step distance from the bottom point to the top point when the machine is working. shown in the photo, that the CR engine DOHC car Timor S515i is 9.3: 1

From the information brochure specifications, we can determine that the Timor car engine types require 92 octane gasoline is worth, ie gasoline PERTAMAX.

What if filled with gasoline with a lower octane?
Low octane gasoline is more flammable. The higher the value of CR in machine-value means require high octane gasoline. Engine with high compression makes gasoline burn faster (due to high pressure), which would be a problem is, when gasoline burns early before the spark plug sparks. When the piston rises upward compression, spark plugs precedes burning gasoline, consequently the piston as hard hit by the blast the combustor. We often hear the term "Ngelitik" (pinging / knocking). How describe the perceived severity of the piston knocking? Slowly but surely making a piston like the moon's surface and can even be perforated.

When there is a 'knocking', not gasoline into the unused power. The machine is not working optimally. Back repeated, CR engine is high, requiring a slow burning gasoline. The higher the CR value, the slower burning gasoline to be (high octane). So to my friends, look at the value of CR engine cars / motorcycles we (can peek at the list below), fill in the appropriate fuel for the engine.
What if filled with gasoline with a higher octane?
Gasoline with a higher octane (pertamax, pertamax plus, etc.), generally equipped with cleaning additives, and so on. However, not many give additional power, so high octane does not mean more power. Because benefits are comparable if less than the price is high, then the edges are simply a waste of money.
conclusion:
Recommended refuel appropriate compression ratio values​​. (unless there are other modifications).
Increasingly HIGH octane rating, the slower the fuel burns (due to higher grilled point).
Increasingly HIGH octane rating, the more difficult vaporized gasoline (low evaporation)
Gasoline that failed to fire (due to too high octane), can cause a buildup of crust in the combustion chamber or on the valve.
Alternative solution:
Many ways to get around in order to use Premium gasoline engine air-CR high, but the machine did not have a 'knocking', among others:
Adding Octane Booster on gasoline (petrol tank included)
Using a catalyst to raise the octane rating (usually containing lead, not environmentally friendly).
Changing degrees of ignition timing (ignition timing) to a position more slowly (Retard).
Using a water-injection applications (rather troublesome for maintenance).
Many of us see, especially at the pump, new motor that high berkompresi long queue at the gas pump of Premium. Economic factors are more urgent than the impact damaged his bike next to the machine or indeed a lack of information regarding the selection of this gas.

Table Fuel Motorcycles Yamaha accordance Compression Ratio