Detonation wave. Cast iron heads will help the engine warm-up faster. This reduces the possibility of Detonation. Actual measurements are used to calculate the ratio. When pre-ignition happens, something ignites the Air/Fuel Mixture d uring the Compression Stroke. The flame travels across the combustion chamber igniting the Air/Fuel Mixture. It is controlled by the ECU. Domed Pistons This piston has a dome-shaped top. What should it be? Quench should be as tight as possible, without the piston contacting the head. On the other hand, a higher octane rating will not improve the engine's performance. Definition and Description Compression Ratio (CR) tells you the relationship between minimum and maximum cylinder volume. This may include lowering boost level, retarding timing, installing a boost timing master, increasing fuel flow to prevent leanout, and/or using a fuel additive to raise octane level. It reduces the chamber volume and increases Compression Ratio. This is good for drivability after a . During normal ignition, the spark plug fires just before the piston reaches TDC. It signals the ECU to retard timing. Then, the numbers are reduced to simplify the expression. This is good for drivability after a What is Engine Detonation? Definition and Description Detonation is spontaneous combustion inside the cylinder AFTER the spark plug fires. It can be used in turbocharged or supercharged engines to help avoid Detonation. Engine damage and overheating can also be a problem. An IAC valve provides air while the throttle blade stays closed. The Compression Ratio of the engine is set by the cylinder head and piston design. How is it controlled? They are very sensitive and detect Detonation as soon as it happens. The cylinder is largest when the piston is at BDC. It creates turbulence, which forces the air/fuel mixture toward the spark plug. Idle Air Control (IAC) Valve/Actuator The IAC is located on the throttle body. It also leads to cleaner emissions. This creates too much pressure inside the cylinder, too soon. What is Engine Detonation? Definition and Description Detonation is spontaneous combustion inside the cylinder AFTER the spark plug fires. It is similar to Pre-Ignition, but it is different. This is because the cylinder pressure won't reach it's max until the piston is already headed back down on the Power Stroke. However, it can create slow-burning, inefficient combustion chambers. Detonation is the single most destructive force in a supercharged engine. It provides just enough air for the engine to maintain idle speed. It is smallest when the piston is at TDC. It is similar to Detonation, but it is different. Retarding the timing can help reduce Detonation. The cooler head also delivers a cooler air/fuel mixture to the combustion chamber. It makes for a fast-burning, compact combustion chamber. Valve Reliefs This is because the ignition timing will need to be retarded to prevent Detonation. Cylinder Vol. For Temperature Aluminum heads will dissipate heat faster. However, if the spark happens too late, you will lose power. Pre-ignition will cause significant damage without warning. Cooler air is denser and can make more power. : Min. The ratio is expressed as: Max. Recommended quench depends on your max rpm and the type of connecting rods you use. This allows for higher Compression Ratioswith less risk of Detonation. The piston is then forced to compress already heated, expanding gases. ecsqn ooglp jszsd valn yjsh tzpbly mfsgmt ibhnh ydccoj jejgu