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Stationary Engines Discussion Forum

What makes it a hit and miss

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Alan Dewsnup

07-13-2006 19:42:24




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I am new to stationary engines. Would someone please describe what makes a true hit and miss? What is throttle governed? What is an engine called that hits on every power stroke?
Thanks, Alan




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Will/ MN

07-13-2006 20:22:29




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 Re: What makes it a hit and miss in reply to Alan Dewsnup, 07-13-2006 19:42:24  
On a hit n miss engine the governor controls the spark. Meaning that once the engine gets up to the set speed a mechanism is triggered that stops the spark from taking place, thus slowing it down.

On a throttle governed engine the same applies except it is the fuel supply that is cut off.



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Bob

07-14-2006 09:47:47




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 Re: What makes it a hit and miss in reply to Will/ MN, 07-13-2006 20:22:29  
Not all hit-and-miss engines shut off the spark while "missing".

Even more importantly, while "missing", typically the exhaust valve is held open, preventing the cylinder from "sucking" gas through the mixer.

This controls the speed, and also saves fuel, as it is not taking in gas during the "miss" time, and wasting it out the exhaust. If only the ignition were shut down, that is what would happen.

Part of the distinctive "hit-and-miss" sound is this "chuffing" of air in and out of the exhaust port while "missing".

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doogdoog

07-15-2006 02:31:37




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 Re: What makes it a hit and miss in reply to Bob, 07-14-2006 09:47:47  
Aloha Bob, "Even more importantly, while "missing", typically the exhaust valve is held open, preventing the cylinder from "sucking" gas through the mixer." How is the exhaust valve held open?? TIA

Mahalo,
doogdoog



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Bob

07-15-2006 06:01:11




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 Re: What makes it a hit and miss in reply to doogdoog, 07-15-2006 02:31:37  
Typically, a lever controlled by the governor "latches" the exhaust valve pushrod mechanism in the "open" position during "miss" time, then releases it, as the engine slows a bit, and needs to "hit" again. Also, when latched, the mechanism typically also did not operate the breaker points, or the magneto.

The link below shows a model hit-on-miss engine, and decribes how the mechanism works. There were lots of variations in the mechanism between manufacturers, but they accomplished the same thing, holding the exhaust valve open during "miss time"..

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doogdoog

07-15-2006 22:55:53




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 (NM) Thanks Bob in reply to Bob, 07-15-2006 06:01:11  
Aloha, Thanks Bob.

Mahalo,
doogdoog



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