What is crankcase scavenging?

A crankcase scavenged two-stroke engine includes a piston reciprocably mounted in a cylinder. An inlet duct is arranged to supply combustion air to the crankcase and a throttling valve is arranged to throttle the flow of air through the inlet duct.

What do you understand by term scavenging explain?

verb (used with object), scav·enged, scav·eng·ing. to take or gather (something usable) from discarded material. to cleanse of filth, as a street. to expel burnt gases from (the cylinder of an internal-combustion engine).

What is a Strato engine?

Engines with a high power to weight ratio and a high-power output per engine cc size are classified as high-performance engines, and these are the only type of engines made by RedMax. …

What are the three methods of scavenging explain each?

Three basic systems are in use: the cross flow, the loop and the uniflow. All modern slow-speed marine diesel engines now use the uniflow scavenging system with a cylinder-head exhaust valve. In cross scavenging the incoming air is directed upwards, pushing the exhaust gases before it.

What is a scavenge space?

Scavenge space, as we know, is an enclosed space under the piston of the engine. Stuffing box on down side and piston on top makes it a closed space. And fresh pressurized air is continuously fed into this space.

What does no scavenging mean?

Scavenging is the act of unauthorized persons going through recycling or refuse containers, whether the containers are located on City or private property. Like illegal dumping, scavenging is a crime in San Diego, and it is taken very seriously by the City.

What are the benefits of scavenging in engine?

Scavenging is the process of removing exhaust gases from the cylinder after combustion and replenishing the cylinder with fresh air. Efficient scavenging is necessary for good combustion of fuel inside the engine cylinder. The passage of scavenge air will also assist cooling of the cylinder, piston and valves.

What does Strato saw mean?

Re: What is a “stratos” saw It stands for stratified scavenging. In short, the saw will have a two barrel (or split barrel) carburetor, and two distinct intake channels. One channel carries only clean air while the other carries the fuel/air mix.

What is scavenging in an engine?

The scavenging, in an internal combustion engine (IC Engine), is the process of removing the burnt gases from the combustion chamber of the engine cylinder. Though there are many types of scavenging, yet the following are important from the subject point of view:

What are the different types of scavenging methods?

1. Crossflow scavenging. In this method, the transfer port (or inlet port for the engine cylinder) and exhaust port are situated on the opposite sides of the engine cylinder (as in the case of two stroke cycle engines). 2. Back flow or loop scavenging.

What is the scavenging efficiency of a diesel engine?

Note: The scavenging efficiency of a four stroke cycle diesel engine is between 95 and 100 percent.

What causes fresh charge to escape from a two-stroke ignition engine?

In the case of two-stroke spark ignition engine, there is a possibility of the fresh charge escaping out with the burnt exhaust gases because there is a small fraction of a revolution of the crank during which the exhaust of the burnt gases and the entry of the fresh charge is taking place simultaneously.