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- Dictionarydetonation/ˌdɛtəˈneɪʃn/
noun
- 1. the action of causing a bomb or explosive device to explode: "she was in a control building at the time of detonation"
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Because detonation interrupts that design, it robs the engine of power. Most engines can handle some minor detonation. Modern, fuel injected engines can sense a knock and adjust the Air/Fuel Ratio and Ignition Timing. However, if the detonation is not fixed, it will damage the engine. Just one major detonation event could cause significant damage.
Pre-ignition is combustion inside the cylinder BEFORE the spark plug fires. It is similar to Detonation, but it is different. Air/Fuel Mixture d uring the Compression Stroke. This creates too much pressure inside the cylinder, too soon. The piston is then forced to compress already heated, expanding gases. Pre-ignition will cause significant ...
The right amount of quench can promote fast, complete burn of the air/fuel mixture. It creates turbulence, which forces the air/fuel mixture toward the spark plug. This reduces the possibility of Detonation. It also leads to cleaner emissions. What should it be? Quench should be as tight as possible, without the piston contacting the head.
Dished Pistons. This piston has a bowl- or dish-shaped top. It is used to reduce Compression Ratio because it adds volume to the chamber. It can be used in turbocharged or supercharged engines to help avoid Detonation. It makes for a fast-burning, compact combustion chamber.
Higher than 8.0:1 is not necessary or recommended. Fuel, ignition timing, and total boost could become critical factors. 4 - 7 psi boost level. This range has proven to be the best compromise for power and reliability. 4,500 - 5,000 engine rpm. When using stock cast pistons, the engine should be limited to a maximum of 4,500-5,000 rpm.
What is the compression ratio? Compression Ratio (CR) tells you the relationship between minimum and maximum cylinder volume. The cylinder is largest when the piston is at BDC. It is smallest when the piston is at TDC. The ratio is expressed as: Max. Cylinder Vol. : Min. Cylinder Vol. Actual measurements are used to calculate the ratio. Then ...
Retarding the timing means the plug fires later in the compression stroke (closer to TDC). Retarding the timing can help reduce Detonation. However, if the spark happens too late, you will lose power. This is because the cylinder pressure won't reach it's max until the piston is already headed back down on the Power Stroke. Engine damage and ...
Gasoline is a mixture of various chemicals. A sample of the fuel blend is run in a test engine in a lab. The octane rating is assigned based on the test results. There are 2 common octane tests: Research Octane Number (RON) In this test, the engine is run at 600 rpm with variable compression ratio. The results are compared with mixtures of ...
What is Camshaft Duration? Duration is how long the valve is off its seat. It is listed in degrees of crankshaft rotation. When someone refers to a "big cam," they mean it has longer duration, not higher Lift. Manufacturers often list 2 different duration values: Advertised Duration is the degrees of crankshaft rotation that the lifter is ...
What are the benefits? Fuel injection delivers fuel more precisely than a carburetor. This lets you run more ignition advance before Detonation occurs. It's basically free horsepower you can pick up when switching to EFI. The ECU can retard the timing too. This allows you to accurately dial back advance with boost or nitrous.
