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When the slide vale is in the center position and air is applied to the steam chest it should seal will little or no air coming out the exhaust right?

I will give that a try. by the way Jason what drawing program do you use?

Yes I should have said I have .098” travel from center in each direction. Total movement is .196”

Jason , Ken I want to thank you both for your patience. I put a dial indicator on all the moving parts of the steam chest linkages and what I found was .098” everywhere except the slide valve itself. It was about .080”. I got the drawings for this unit off GrabCad. And as Brian Rupnow stated...

Hey guys how open should each port be when it is in the open position. 100% 50% 25%?. I am sure I do not have enough offset.

I am wondering. I have .098” offset. I wonder if this is enough.

Wouldn’t you know that you pick the drawing I did not use. All the drawings and grab cad show the eccentric linkage up. The one I used shows the eccentric linkage down. I took the steam chest apart flipped the slide valve upside down and then hooked everything up with the cover off. When I...

Just so everyone knows:):):). This the unit running just after I built it. See the media section

Initial run

I am not sure how to explain it but when the engine runs now it has a hard knock in it. As if part way thru the stroke air is getting to the other side of the piston. I have a lot of lube in the unit now and if I turn it over by hand there is no tight spots.

Here is an Interesting question. If the slide valve is positioned properly but the stroke is 30% short how would the cylinder react?

Hey guys thanks for all the help. I have tried everything anybody has suggested and still no joy. As you can see I can get to run but not well. I have no play in the valve string. I put a dial on the slide valve itself and I should have .196 total travel and I have .131. As Jasonb sayes I will...

I was thinking the same thing. I took the unit apart the other day to check the offset on the eccentric. It’s is .093”. But you are right when I measure the actual throw on the slide valve I am only seeing .065” the difference is in loose connections. Also I put pressure in the steam chest and...

I was thinking the same thing. I took the unit apart the other day to check the offset on the eccentric. It’s is .093”. But you are right when I measure the actual throw on the slide valve I am only seeing .065” the difference is in loose connections. Also I put pressure in the steam chest and...

Thanks Charles The piston seals are nice and tight. And you are right I forgot to oil the steam chest.

It’s ingesting to watch it run. There seems to be a knock on each stroke. And some times if I run just one side I can get the piston to move back and forth just 1/2 a stroke.

Hey guys it’s me again. I can almost get this puppy to run (see media). I have to much play in the slide Valve linkage and if you look at the Grab Cad drw. The linkage is secured to the shaft by a small setscrew. There are to links and a setscrew in each one. After a while the set screws come...

Hey guys check out the media part of this forum. Here she is running (sort of). I can’t get any speed. It runs very free but still takes 30 psi to run. I can’t figure out how to post a video here but there is one in the media part.

Here she is running for the first time. I can get it to run but only at slow speed. It turns very freely. It take 30 PSI to run

First Run