My latest project named "Red"

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Rdean33422

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Success!!!!


Specs
1" bore
2" stroke
5 to 1 compression ratio
crankshaft and connecting rod all on ball bearings
6" flywheels weigh 4lbs each
low speed 420 rpms
21 revolutions between power strokes
almost no vibration

I now have over 2hrs run time on the engine with no problems.
I wanted a slow running long cycling hit-miss engine and that is exactly what I got.

Thanks for looking
Ray
 

Steamchick

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Hi Ray, before you spoke, I thought "I bet you are happy!", "Very smooth and repeatable firing", No apparent vibration", and "Why does the governor rattle a bit in mid-bob-weight position?".
But WELL DONE on a really good, well tuned, model. What is next? - A generator to run off the engine? Then you can demonstrate the idle (lights=OFF) to constant running (Lights ON and Generator working) at the flick of a switch!
Hi Brian, I guess the governor weights, when in "mid-position", have a bit of necessary slack and oscillate a bit?
Ray, what thoughts?
K2
 

Rdean33422

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The governor is dead simple to make as the pictures show.
I was surprised that it worked so well right from the start. I have tried different adjustments to the springs and wires but finally put everything back to where it was in the beginning.

IMG_0845.JPG
It is driven off the crankshaft via a rubber belt (o-ring) at about 1/2 engine speed. I wasn't concerned about the exact speed I just wanted it to run slower and that was the size of the material I had on hand.

IMG_0847.JPG
The spring on the upright shaft just preloads the fly weights and sets the at rest position of the balls. The fly weight arms are connected to the spool with two bent wires.

IMG_0851.JPG
The spring on the push rod holds the rod up so the exhaust valve can close and the engine fires. It also preloads the rocker arm and helps return the spool back down to firing position when running.

If you have any questions don't hesitate to ask.

Thanks for looking
Ray
 

awake

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Very nice. Is the lever bearing directly on the exhaust valve - is that the exhaust valve itself, or does it connect to the exhaust valve closer to the head of the engine?
 

Rdean33422

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Here is an earlier picture showing the exhaust valve and rocker arm in the head.
IMG_0800.JPG

The rocker arm is connected to the long push rod along the side of the engine. At the end of the rod there is a brass block that rides on the cam lobe. The short rod back by the flywheel catches that block and holds the exhaust valve open until the engine slows down and then releases it.


Ray
 

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