How a Mechanical Governor Works on a 4-Stroke Lawnmower Engine
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- čas přidán 23. 04. 2023
- This How a Mechanical Governor Works on a Small Four Stoke Lawn mower Engine.
This video shows you how the mechanical governor works on a 4 Stroke Lawn mower, but the principles of this can be applied to the workings of an Engine Governor in general.
So, whether you are using a Riding lawn mower, Push mower, Petrol lawnmower or even an electric lawn mower, this principle could possibly be valid. The Robot Lawn mower doesn't escape this principle either!
If you are having problems starting your lawnmower then please do take look at my other video, where I help you get back you and running again if your Lawn mower Won't Start: • Lawn Mower Will Not St...
Link to Engine Transformation Video: • How this Rusty Old Law...
Four-stroke internal combustion engines frequently employ a mechanical governor system to control engine speed and maintain a constant RPM (revolutions per minute) under a variety of load circumstances. To maintain smooth operation and avoid overspeeding or underspeeding, the governor system helps regulate the fuel flow to the engine.
A four-stroke engine's mechanical governor system is described in the following manner:
The mechanical governor system consists of the following essential components:
Flyweights, a control lever, and the governor shaft are all part of the governor assembly.
The throttle regulates how much gasoline and air are injected into the engine.
Control Springs: The governor system requires a certain amount of tension from these springs in order to function properly.
The governor assembly is joined to the throttle mechanism by linkages.
Sensing Engine Speed: The governor system keeps track of the engine speed. This is accomplished either by a governor gear installed on the flywheel or by a magnetic pickup that measures the engine's rotational speed. The governor assembly is connected to the governor gear, also known as the magnetic pickup. Two flyweights are a part of the governor assembly and are fastened to the governor shaft. The flyweights are subjected to an increase in centrifugal force as engine speed rises. The governor shaft is rotated by this force, which also causes the flyweights to travel outward.
Control Lever and Linkages: A control lever that is attached to the throttle mechanism is connected to the governor shaft. The control lever is engaged when the flyweights shift outward as a result of increasing engine speed, and it changes the throttle position appropriately. The control lever limits the throttle if the engine speed is too high, decreasing the fuel supply to the engine. The control lever closes the throttle to decrease the fuel flow when the engine speed rises.
The governor system works on the basis of a feedback mechanism. The engine speed is impacted as the throttle position is changed by the control lever. The governor gear or magnetic pickup detects a change in engine speed, and the flyweights adjust to maintain the correct RPM.
The governor mechanism also makes adjustments for changes in load. The governor system detects the decrease in engine speed when the engine sees an increase in load, such as when more devices are connected or the workload increases. In response, it opens the throttle to give the engine more fuel, making up for the extra load and keeping the appropriate RPM.
Overall, a four-stroke engine's mechanical governor system is crucial for controlling engine speed and guaranteeing reliability. The governor system keeps the RPM steady so that the engine can run smoothly and efficiently under a variety of load conditions by monitoring engine speed, spotting variations, and regulating the throttle position.
I hope you gain something from this.
Many thanks indeed
Craig (Owner and Creator of The Repair Specialist Channel)
#MechanicalGovernor
#EngineSpeedControl
#FourStrokeEngine
#RPMRegulation
#EnginePerformance
#ThrottleControl
#Flyweights
#LoadAdjustment
#ConstantRPM
#GovernorSystem
#EngineGovernor
#EngineSpeedSensor
#FlywheelGovernor
#MechanicalControl
#ThrottlePosition
#LoadVariations
#EngineStability
#GovernorMechanism
#ControlLevers
#SpeedFeedback - Auta a dopravní prostředky
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Hi guys I just wanted to Introduce to you my other Channel "Kirkman's Academy" - which i'm just getting started. It's a go-to channel for simple explanations for hard to grasp subjects such as physics, maths and chemistry etc. Here is the link: www.youtube.com/@kirkmansacademy/videos . Thank you so much for looking, and if these topics interest you then I hope to see you the there. Many thanks indeed. Craig 😊👍
Great video no loud introduction straight to the point and no music while you were talking
Thank you so much
Yes it is ingenious. When the mower engine bogs down in some heavy grass, the governor opens up the throttle and gives it more fuel to try and keep the RPMs up.
Great video explaining how an internal governor works. Extra bonus points awarded for having an actual engine cutaway to illustrate. Well done Sir. Well done indeed.
Thank you so much for your kind feedback. Craig 👍👍👍👍
What can I say, absolutely brilliant demonstration, was always wondering how the governor works, thanks very much greg
That sir is one of the BEST descriptions of that system I’ve ever seen. 👍🏼🇨🇦
Wow, thanks! I really appreciate it. Craig 👍👍👍
Wow, I finally understand how these accursed governors work for small 4-S engines! Especially the linkages always had me baffled.
On my victa lawn mowers the governor operated according to strength of cooling fan blowing on a sail type lever .
Thanks guv .
Perfect explanation on how the governor system is supposed to work. Thank you!
Thank you 👍👍
If your lawn mower has a hunting rpm ( revs up and down almost shutting off in a never ending cycle) or when it starts it revs up high to fall on its face and turns off not wanting to stay running .. the carburetor is dirty ..
some carbs have a center bolt under fuel bowl on the carb this is your primary jet
remove the bolt ( if the bowl stays on that's fine one thing at a time ) with the proper size socket or wrench .. make sure it's passageway that runs through the center and the little hole that's undee the bolt head is clear . Put the bolt back on the carburetor and it should be good to go. ... showed my buddy this some years back ... he would picked up ever mower thrown out on the curb clean the carburetor and sell it to pawn shop... guy was making almost $400 a month doing this at one point.
Wow. Awesome👍
I have a small diesel engine I need to govern to give me more power when the electrical load increases. This video has given me ideas on how I can retro-fit a mechanical governor. Nice to know these mechanical guvnors still exist. Had a hard time searching for them online.
It is the same on gas engines that were used in stationary applications or on heavy duty trucks with PTO’s. The only differences was how they were run. Some ran directly off of the distributer and used vacuum as a reference. So it is mechanical/vacuum governed. Most actuations of the throttle plate directly were done by vacuum and simply not by levers. Same concepts apply though. Others were vacuum only like many 1bbl carbs. They used manifold vacuum reference to open or a close a secondary throttle plate to control the rpm. This was set by spring tension on a diaphragm. The other way is mechanical entirely similar to the modern lawnmower engines you showed in the video. If it was a remote system it simply used cables as reference speed. These same concepts were applied to create the earliest cruise controls like the speedo-stat and the earliest production cruise control Chrysler’s Auto-Pilot. Very cool stuff that very smart people figured out!
Right on 'dynamic' demo. There is nothing quite like a dynamic demonstration, and your's is Well Done.
Thank you!
Thank you kindly! Craig 👍
Yesterday I didn't even know what a governor was, I just knew "something" was acting up on my snowblower. This video and another one on another channel taught me how the ideling(?) in the carburator worked and what part the governor plays in the whole of it. Thank you from Sweden! 🇸🇪
Been trying to find out how these work for years. Thanks for taking the time to explain this.
The best explanation i’ve seen in years. Ricky Huntsville, Ala.
Thank you Ricky for your kind and motivating feedback. Craig
I've had to replace some governor springs that rusted and broke, but I never had the opportunity to open one up to see how it works. It has bothered me for a while, so thanks for this.
This is absolutley brilliant. Not to say your previous 2d graphical animations weren't fantastic but this is top notch when it comes to the educating people in regards to the internal and mechanical aspects of machinery and mechanisms, it just cannot be beat. It's a shame that teaching like this has become a "thing of the past". Mentors like you are not as plentiful as they used to be and are certainly not like were in the 60's!
Wow. Thank you. I really appreciate your kind feedback. Very motivating 👍👍👍
i always thought there was some sort of sensor and microcontroller involved. what a genius mind has created this simple yet workable system. thanks for sharing!
You unlocked a lifelong mystery for me. Thanks
Thanks I finally understand how spring tension on the governor arm affects the position of the throttle
Amazing video! This is the first time I feel like I UNDERSTAND how the governor works 🎉
Excellent video straight to the point and very well explained.
Thank you so much 👍👍
Best explanation i have ever seen. I FINALLY understand how this system works! Thank you sir !!!
My neighbour fixed his mower and now runs flat out constantly, I can now tell him what's wrong! Thanks again 👍
The lawnmower engine knows what RPM it is at by knowing what RPM it isn't and gets itself there.
Remarkable.
Absolutely brilliant!!! I have always wondered how that works. Thank you!!
You are so welcome! Thank you. Craig 👍👍👍
Thanks. I assumed it was some sort of centrifugal gear coupled thing but now I know exactly how it works.
Very well done. Very simple and informative. Thanks for posting.
Thanks for watching! Craig
This was absolutely excellent.
Thank you so much. 👍👍👍
That was very well described. Thanks so much.
You're very welcome! Thank you 👍👍👍
Brilliant explanation and cutaway to explain it all. thank you (Greetings from Australia)
You're very welcome! Craig
Absolutly top notch explanation of lawnmower governor works.j This wold have been impossible had you not spent all those hours preparing the cutaway engine. You are a superb instructor. I once saw a video of yours that had a great big model of a chainsaw carburettor for instruction on how they work. You'd never work it out on your own!....that one had to be the best instructive video i'd ever seen!
That was an excellent explanation of how the governor works.
Great explanation
I'd heard of a governor spring, hadn't a clue what it done. Now I know. Good video.
Absolutely fantastic explanation. Thank you for making this video.
Gr8 explaining to this. I know about it but not all the details.
Great work. The cutaway engine makes things very clear.
This video is stupendous. Now I know how a governor works. Thanks, from a retired electronics engineer. Where is the microprocessor?
thanks for video . I have been interested in knowing how that works for along time .
wow, what a fantastic explanation ! the cutaway sections are amazing. I've been trying to fix my lawnmower for ages, your video has helped me sort it - thanks !
Hello Graig, thanks for this video, I sometimes wondered what id find if my govener failed in some manner , on a 160cc Honda izzy ,.which tries to and mostly runs at a constant speed .Now I know , and its the same principle we see in an engine museum with the shiny brass balls on their centrifugal goveners spinning round keeping the engine at the designed speed within the load limits for the engine . My spare 135cc Izzy looks to be controlled by the throttle lever and what seems to be a vacuum load/speed sensing system but this arrangement allows me to throttle down when needed . Thanks again for another excellent video . A.T.B., Ian 👍👍☺☺
This is a very good explanation
Thank you so much 👍👍👍
You put that old engine to use. "I knew you would"! 👍
Stay well, Joe Z
This helped me so much. Now because of you I understand how governors work.
Thank you so much for your kind feedback. Craig 👍
So glad I found this before I started messing with my cement mixer!
Brilliantly explained
Thank you. I really appreciate it. Craig
excellent explanation and great use of visuals. very helpful. thank you.
Good job explaining and filming the governor system. Liked and subscribed.
Many, *many* years ago (like almost 60 yrs), I had an old lawn mower engine. I don't remember the brand of engine, but I think it was a B&S. Its governor was similar, except the throttle was controlled by a flap in the airflow of the cooling fan. Faster engine speed= more air= close throttle. The cam drive method seems like it would be much more accurate.
Clear and concise. Extremely well put together video.
Thank you. I really appreciate it. Craig 👍👍👍
Thank you. I never understood what was going on there, especially having grown up when lawn mower engines had a separate throttle lever that we controlled. I had no idea all this was going on and I didn't know what was involved. And I've worked on cars for 40 years, lol.
Great video. Thanks for the explanation
Thank you so much. I really appreciate it. Craig 👍👍👍
Excellent description, Thankyou very much sir!
What a great way to do a tutorial! Brilliant! Of course, I'd be fascinated to see the teardown and work done to produce this masterful work of art, so I'll watch that, too. I'm sure we'll see it in action again, in all of its glory. I think you covered how the governor works before, but this makes things ever more clear. Fantastic and Thanks, Mr. Craig.
Edit to add: You forgot to add the link to *Old Rusty Lawn mower Transformed Into Something Very Different! (An Educational Artifact)* so I found it in your Videos page.
excellent explanation and engine cutaway, thank you.
Solid info, thank you
Otima explicação prática do governador...
Exelent! Clear and to the point.
Fantastic video!!! Very clear and concise. I always wanted to know how the heck my mower controlled its throttle.
good explanation
Very well done tutorial with actual working view if the governor system. Narrated and filmed quite detailed yet easily explained! Great video!! 😊
Mate, Thank you very very much for your explanation! Your video's always have the right amount of information and the way you explanate it is spot on! Look forward to your future video's!
Thank you for your Kind feedback. I really appreciate it. Craig 👍
That was an "Oh!" moment for me. Got myself two old Briggs & Stratton mowers to repair, one's running now but sounds like it revs way too high and inconsistently, so this is a solid lead. Wasn't really aware how governors work on engines. Thank you.
The other one probably has a broken spark coil, no spark from the cable connection, and but a drip of oil on the dip stick so probably received no maintenance :(
Always wondered about that thanks!
Good video. Haven't actually seen internal mechanics of governor. Surprised to see so many plastic parts there. Though shouldn't be thinking how cheaply these engines are made of :)
Great cutaway engine Craig! Knowledge is Power!!
Delighted, thanks very much 😊
Couldn't ask for a better explanation
Awesome video ! Thank you for the visuals and clear explanation.
Fabulous explanation and visualization! Thanks.
Excellent setup and great explanation.
This was very helpful, thank you
Thanks TRS!
That was a perfect explanation ! . . . I've always wondered how a gov works. . Thank you.
Excellent practical application, clear and concise.....
Very helpful thank you for the time you put towards educating people like myself
I could never figure out how a governor works or was it for thank you now I do
Best explanation i’ve seen, thank you!
This is great! Thanks!
Great video. Thank you.
I believe the phases "balls to the wall" and (to go) "balls out" come from steam engines. Specifically a centrifugal governor with ball shaped weights was used to control engine speed. When the engine was operating at maximum speed, the ball weights of the governor were fully out due to centrifugal force. For an engine mounted indoors, the balls would be towards the interior walls of the building.
I've always wondered what was inside the crankcase on a small engine. I should have expected a centrifugal governor.
Craig your videos are the absolute best. Thank you so much for sharing your knowledge. Artie 😊
Thank you Artie. I always appreciate your kind and motivating comments. Craig 👍👍👍
Excellent video! 👍
Thank you very much! Craig 👍👍👍
Great vid!
I didn't know that...great explanation...great teacher
Great video!
Very well explained!
this is brilliant, genius, really appreciate your efforts.
Thanks Guv'nor 😆 great explanation 👍
😂
Outstanding!
Good video! Thank you!
I'm thinking this is going to help me to get my lawnmower running rather than frustrating me into higher stress. It's surging a lot and won't stay running if I get it started!
Excellent definitely a THUMBS UP!!!! 👍
Well done!! Thx
Yes Craig, we liked this video!!!
Excellent video.
Very interesting video. Thanks for sharing!
Excellent video
Awesome video...from Canada.