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A chain saw engine pulls down gases from the atmosphere and pushes them into a circular space. This space is divided into smaller segments by walls that move as the crankshaft rotates. Each segment holds a specific item. The rotated wall releases or expels the item out of the engine. Powering chain saws and other small equipment, 38cc engines usually split into two-stroke and four-stroke engines.
Two-Stroke 38cc Engine:
Two-stroke 38cc small engines complete an entire power cycle in just two strokes of the piston (one revolution of the crankshaft). Fuel and oil are mixed and consumed during the up and down movement. There's a port for exhaust to leave while fresh fuel enters. This type of engine has high power output due to its lightweight design. They cost less but produce more power than four-stroke engines. They're ideal for equipment that needs constant fuel supply, like chain saws. Two-stroke engines are further classified into membrane carburetor engines and gasoline mix engines.
- Membrane Carburetor Engines: These engines use membrane carburetors to mix air with gas. The membrane responds to changes in pressure caused by air flowing through it. More air pressure means more gas pressure from the carburetor. This results in a proper fuel-air mix for the engine to run smoothly. Chain saws that use the membrane carburetor engine are usually efficient and have lower emissions.
- Gasoline Mix Engines: In these engines, oil and gasoline are blended before reaching the fuel system. The mixture reduces friction within the engine and helps in proper combustion.
Four-Stroke 38cc Engine:
Four-stroke 38cc small engines need four strokes of the piston (two revolutions of the crankshaft) to complete one power cycle. They have separate chambers for intake and exhaust, and fuel passes through the crankcase before moving into the combustion chamber. With a more complex design, four-stroke engines are larger, heavier, and more durable than two-stroke engines. They are preferred in applications where longevity and reliability are crucial. Chain saws that use four-stroke engines don't require the oil and gas mix. Instead, they have oil sumps that allow the engine to lubricate itself.
The specifications of a 38cc engine will vary according to its applications. For instance, a two-stroke 38cc chainsaw engine will differ from a four-stroke 38cc tiller engine in terms of power output.
General specifications:
It is critical to maintain the engine properly for longevity. Manufacturers usually provide specific instructions on maintenance. The following are some general suggestions for 38cc engine maintenance:
Small outdoor power tools and equipment:
38cc two-stroke engines can be commonly found in trimmers and blowers, among other outdoor power tools. Such devices are usually cordless and rely on fuel to provide their power source, making them functional and useful for landscapers and gardeners on very large and difficult-to-reach areas.
Hedge Trimmers:
These engines can also be found in some hedge trimmers. While generally, cordless hedge trimmers are preferred for their ease of use, those requiring maximum capacity and power will opt for those that are fuel-powered.
Earth Augers:
Earth augers can also utilize 38cc engines. These tools are drilled that can help make holes in the earth. Usually, they are held on with hands and used for a variety of tasks like fence post holes, planting deep-rooted trees, and even digging for plumbing and electrical lines. 38cc-powered earth augers are generally recommended for those professional users looking for heavy-duty digging.
When selecting the 38cc engine, buyers should consider a few features and applications to ensure they meet their needs.
Match the application:
Choose the engine based on the specific use. For example, select a powerful engine with a higher torque for a heavy-duty drill. On the other hand, a lighter engine can work perfectly with a small, lightweight drill. Also, consider selecting an air-cooled engine that will work well in lawnmowers and concrete cutters.
Upgrade the current engine:
When upgrading to a new engine, select one with similar dimensions to avoid making significant adjustments to the equipment. Also, ensure the new engine’s horsepower will deliver sufficient power for the existing workload.
Fuel type:
Choose an engine that works with the preferred fuel type. For instance, dual-fuel engines may be suitable for some businesses that want flexibility in fuel choices.
Emissions and compliance:
Select an engine that complies with environmental regulations in the operating region. Some equipment, like chainsaws and lawnmowers, must meet specific emission standards.
Cost and long-term value:
When deciding on an engine, consider the initial cost and the long-term value. Choose an engine with excellent fuel efficiency to lower operating costs in the long run. Also, opt for an engine from a supplier or manufacturer with good support and reputation. This will make it easier to get support and spare parts in the future.
Q1: How powerful is a 38cc engine?
A 38cc small engine typically produces around 1.5 to 1.6 horsepower. While this isn't a high figure compared to larger motors, it provides sufficient power for the backlog of equipment designed to use 38cc engines.
Q2: Is a 38cc engine greater than 40cc?
No, a 38cc engine is less than 40cc because it has a smaller cubic capacity. The greater the cubic capacity of an engine, the more powerful it is.
Q3: What is the difference between 2-stroke and 4-stroke engines?
The 38cc 2-stroke lawn mower engine applies fuel and exhaust concepts in two operations, making it lighter, smaller, and more powerful. On the other hand, the 4-stroke chainsaw engine is more fuel-efficient. It can be used in most outdoor equipment and motor vehicles, including those that require larger horsepower.
Q4: How long will a 38cc engine run?
Factors affecting the lifespan of a 38cc small engine include operation time, maintenance care, environmental exposure, and fuel type. Generally, if properly maintained, a 38cc engine in a lawn mower may run for around 1,500 to 3,000 hours.
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