When should you advance ignition timing?
Ignition Advance Advancing the timing means the plug fires earlier in the compression stroke (farther from TDC). Advance is required because the air/fuel mixture does not burn instantly. It takes time for the flame to ignite the all the mixture. However, if the timing is advanced too far, it will cause an Engine Knock.
What causes detonation in a 2-stroke?
Detonation, unlike a normal engine combustion process, is a condition where the fuel and air inside of the combustion chamber spontaneously combusts or “explodes” rather than burning at a very specific c rate. This spontaneous combustion occurs as a result of having a combination of excessive heat and pressure.
How does timing work on a 2-stroke engine?
Ignition timing for 2-stroke engines is determined by the height of the piston before top dead center. The ignition timing given in the maintenance manuals of the time is indicated by the distance from top dead center, not the angle of the crankshaft. 1 before top dead center.
What aspects will affect when advancing the timing on a diesel engine?
Advancing the timing can lead to more smoke. It can cause a lot more vibration in the engine, making it noisier. It will also increase NOx emissions, which is the reason manufacturers usually retard the engines slightly in the first place.
How do you get rid of detonation?
A plug that’s too hot will retain too much heat, causing detonation. A change to a colder heat range plug is often all that’s needed to shut down unwanted detonation. Be aware, though, that too cold a plug can cause the opposite problem of fouling, which is when a plug fails to fire the air/fuel charge altogether.
Why does advanced timing cause detonation?
Too Much Ignition Timing Advance Aggressive timing advance increases pressure and heat while the mixture is being compressed. This can cause the remaining mixture to detonate.
Does a 2-stroke have a timing chain?
As you can see, a two-stroke engine does not utilise poppet valves like in a four-stroke. That means it doesn’t require a cam chain or belt, camshafts, buckets, shims, springs, etc. in addition to the valves.
What Causes 2 stroke detonation?
Does detonation occur in diesel engines?
Detonation is observed in petrol as well as in diesel engines. In petrol engines, the detonation is caused due to the auto-ignition while in diesel engines (CI engines) detonation is caused due to the high ignition lag.
Does advanced timing cause knocking?
Ignition Timing Over Advanced If your ignition timing is over advanced, it means the engine is firing the spark plug too soon. When this happens, the air/fuel mixture ignites too early and causes detonation, which makes the knocking noise you hear.
Can you cam a 2-stroke?
2-stroke engines don’t have a camshaft, nor do they have valves, as you would find in a 4-stroke. Instead, they feature a sleeve valve system where two permanently-open ports exist adjacent to each other in the cylinder wall. These are known as the exhaust port and the inlet port.
Is there a 3 stroke engine?
A three-stroke internal combustion engine completes a complete combustion cycle of exhaust, intake, compression, ignition, and expansion within a single revolution of a crankshaft by a single stroke of a first piston and a single stroke of a second piston within a single cylinder.