How the 2-Stroke Engine & Carburetor Work Together!

An Enlightening Explanation of how the Engine & Carb work as One. FOR GREATER KNOWLEDGE

- So let's begin: An internal combustion engine known as a two-stroke engine runs on a special cycle that requires two piston strokes (up and down) to complete one cycle of operation. Due to its simplicity and lightweight attributes, this design is frequently employed in smaller power equipment like chainsaws, motorbikes, and outboard boat engines. A two-stroke engine operates as follows:

The piston begins its downward movement during the intake stroke when it is at the top of the cylinder, close to the spark plug. It uncovers ports or apertures near the cylinder bottom that are connected to the crankcase (lower part of the engine) as it descends. In the cylinder, the piston's downward action partially evacuates the space.

Air-Fuel Mixture Intake: As the piston descends, a mixture of air and fuel (typically premixed) is taken into the cylinder from the carburetor or the fuel injection system. Then, through the open ports, this mixture is drawn into the crankcase.

Compression Stroke (Upward Movement): After the piston completes its downward stroke, it turns around and ascends the cylinder in the opposite direction. The air-fuel combination pumped into the crankcase during the intake stroke is compressed as it rises. Near the apex of the stroke, the spark plug ignites this compressed mixture.

Power Stroke: As the compressed combination burns, a high-pressure, expanding gas is created. Mechanical work is produced as a result of the expanding gas pushing the piston down the cylinder. This is the engine's power stroke.

Exhaust Stroke (Upward Movement): The piston resumes its upward motion after the power stroke. Near the top of the cylinder, it reveals exhaust openings as it rises. Through these exhaust ports, the expanding gas from the power stroke is discharged into the exhaust system.

The cycle is repeated, and the engine keeps running as a result. At the end of the exhaust stroke, when the piston has reached the top of the cylinder, the intake ports are once more exposed, and the cycle repeats. A power stroke occurs after every two piston strokes (one full up-and-down movement) in a two-stroke engine.

Two-stroke engines are notable for their simplicity and light weight, making them appropriate for applications where compactness and strong power-to-weight ratios are crucial. However, in comparison to four-stroke engines, which have an independent intake and exhaust stroke, they also frequently use less gasoline and sometimes emit more pollution. Additionally, two-stroke engines frequently need their fuel and oil mixed together in order to lubricate the moving parts.

This principle works for most types of Chainsaw saws, and the following also helps with Chainsaw maintenance. So, whether you are using a Stihl Chainsaw, Husquvarna Chainsaw, basically, all types of Petrol Chainsaw are valid for this principle, as well as many types of or a 2 Stroke Engine. The Electric Chainsaw, of course, escapes this whole principle!

I really hope you enjoy. Craig

Many thanks

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#AirFuelMixture
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#EngineEfficiency
The creation of information in this description was helped by ChatGPT

[amalfi]

Wish my teachers growing up could get their point across as well as you do sir

[typeppernell]

this is by far the best video ive watched on this. cleared up so many questions I had. Thankyou

[animeanibe]

Explained what I've been wondering all my life in a matter of minutes. Amazing!

[ahobimo]

WOW! This is fantastic!
A teacher of mine once said that the best indicator of how well you understand a topic is your ability to explain it clearly to others. By that metric, you understand 2-stroke engines better than anyone I've ever met!
Equally impressive is the fact that you've illustrated a complex, dynamic process using only paper and colored markers! OK, maybe a straight edge as well. ;-)
Although price might not have been the determining factor in your choice of methods, it still goes to show that imagination and diligence are often more important than having the best, most expensive equipment.

[ManfromVega]

I've watched dozens of videos about the two stroke engine, trying to understand how it works. And i managed to understand it, but then i came across this video, which is by far the best way it has ever been explained. Such detail and in lamen terms. Thank you soo much!!!

[mvmcali]

Tremendous explanations...perfect balance of detail and simplicity.! Love the detailed explanation

[geojor]

the best on youtube, congratulations on your hard work to put these videos for the DIYers ...

[outbackenduro]

EXTREMELY well explained, what a great contribution to all of us thank you

[susanl]

Thank you for your videos...I have many people in my life who like to fix things FOR me, and none who really have the time to teach me. I just purchased a used fs90 Stihl Weed Eater, and right away am having problems. I have decided that it's time to start learning about how engines work, and your videos are immensely helpful. Thanks you!

[siskiyouwoodsmann]

You sir should be teaching this at trade school level as your illustrations and explanations are unparalleled. I suspect you’ve already made a great difference in turning parts changers into true diagnostic technicians. Well done 👍

[athhud]

I wish you were my instructor for every class I've ever taken. The way you illustrate and explain works exactly like my own mind. Great job! Honestly, I thought I knew pretty much everything there is to know about 2 stroke engines, but it seems that there is a little fact in everyone of your videos that I'd never considered. For instance with this one, I had no idea that air/fuel was transferred from underneath the piston to the top of it. I always assumed that it drew air in through the intake on the down stroke like a 4 stroke engine. Thanks for sharing your vast understanding of this topic!

[CaleyCreations]

I'm just about to take delivery of a Stihl cut-off saw and was a bit worried that my lack of engine knowledge would hamper my maintenance/repair attempts, but this is an excellent video demonstrating not just the engine, but the carburettor too. It's actually very similar to premix burners in gas boilers which I used to work with so quite easy to relate to it. Many thanks :)

[oppanheimer]

Best explanation/illustration I've seen on 2 stroke operation. Thank you sir.

[gregmelton]

Cogent, clear, concise with very nice visual elements. Thank you so much for this presentation!

[nathansegurakennedy]

That was phenomenally illustrated! I understood this on the first time watching and learning. Great work m8

[joshuasanborn]

The best explanation I've ever seen on the subject!!

[Guarrdian]

Terrific! I daresay you've got the best explanatory videos on this topic internet-wide!

[samazd]

Great video. All my questions about how the carb works have been answered thank you

[dineshr]

Thanks for the knowledge share. I now know how all the pieces work together. This is masterpiece. this new well intact closely knitted working process of the engine has reduced movement time of humans drastically and benefited our humanity of this decade.

[bonnie-voyage]

Great explanations. Thanks for taking the time to explain and upload.