How does a governor work?

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Old 11-23-08, 04:59 PM
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How does a governor work?

Im trying to get my little jacobson snowblower going but the governor wont work right, looks like a chimpanzee made it. Im kind of confused on how its supposed to work. Its just a plastic wing over the flywheel like most lawn mowers.
 
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Old 11-23-08, 05:36 PM
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Are you missing the monkey that holds it in place??

LOL, they work with a spring that provides a little tension and air flow created by the flywheel fan when the engine is running. Air blows against the governor vane and pushes it to close the throttle on the carburetor. The spring provides tension to maintain a certain rpm setting, and increasing the spring tension results in a higher operating rpm (faster) and decreased tension causes lower operating rpm's (slower). If the tension of the spring is too low, then the engine will only idle, if the tension is too great it can run too fast or may surge (up and down) in speed.
 
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Old 11-23-08, 08:23 PM
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What does the governor do when the engine gets under load?
 
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Old 11-24-08, 12:13 AM
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It opens the throttle a bit, depending on the load. The more of a load you put on the engine, the more it tries to slow down. If the engine slows down, the fan isn't blowing the governor vane as hard. The vane is connected to a linkage to the throttle which opens the throttle... increasing engine speed....producing more wind on the vane until it reaches an equal resistance to the spring tension, maintaining engine rpm at all times.
 
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Old 11-24-08, 09:33 AM
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Originally Posted by cheese View Post
It opens the throttle a bit, depending on the load. The more of a load you put on the engine, the more it tries to slow down. If the engine slows down, the fan isn't blowing the governor vane as hard. The vane is connected to a linkage to the throttle which opens the throttle... increasing engine speed....producing more wind on the vane until it reaches an equal resistance to the spring tension, maintaining engine rpm at all times.
Thats how I thought it would have to work but looking at it It seemed like it would close it when it slowed down, I must have been having a brain fart.
 
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