New Compressed Air Hit n Miss Engine

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cfellows:
Managed to get a few more things done. The governor is patterned after the one Phil Duclos used on his Victorian engine. I made the 5/8" brass balls using an over-the-top ball turner that I had made several years ago. Before I could use it however, I had to adapt it to my QCTP. I used the boring bar holder and inserted a 3/4" brass bar that I had bored out to 1/2" to accommodate the 1/2" shaft of the ball turner. The small protrusions on one end of each ball will be turned off and bored to accept the swing arms of the governor.

I also made the piston and the connecting rod. The latter is made from 3/8" thick x 3/4" wide aluminum. Finally, I also finished the crank disk but still have to make the crank pin.

And, here's a couple of images with a few of the parts loosely hanging in place

Chuck

cfellows:
Well, I think I'm within a day or two of having this thing ready for a test run. It will take a little longer to get the governor bits all hooked up so it runs in hit n miss mode, but I should have all that part finished as well in less than a week, maybe by the weekend sometime. I'm really pleased with the way everything is turning out. I think this will be a nice looking and good running engine.

Got to get it finished, I'm already thinking about my next project.

Chuck

sbwhart:
:drool:

Thats comming together real well Chuck, looking forward to seeing it run.

Stew

cfellows:
Thanks Stew.

I got the engine running last night and made a number of improvements and tuneups today. Once I got it all together, there were several embarrassing problems that I had to correct.

- The connecting rod was too long so the piston was hitting the head before top dead center. Had to mill a depression in the head and face a 1/16" off the top of the piston.

- The connecting rod was hitting the side of the cylinder so I had to turn a bevel on the inside of the cylinder and turn the rod down to a smaller diameter.

- The valve travel was insufficient to open the valve, so I had to do some more machining on the cam. Also had to increase the dwell since the valve wasn't staying open long enough.

Today I corrected all that. I also added the plumbing to bring the air supply line out the side of the base. Now all I have left is to complete the governor and valve latching mechanism so it will run in hit n miss mode.
Got a video loading on youtube at the moment.

I will post the video as soon as it finishes uploading. Here are some pictures.

Chuck

cfellows:
And here's the video...

http://www.youtube.com/watch?v=9xECJ4WTrf8

Chuck

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