Hi guys,
Well I'm really pleased to report I have managed to make a significant improvement to the running
.
I began by getting everything as symmetrical about the centre stroke as possible then modified the HP exhaust valve by 0.5mm to get a later closing. I was then able to close those drain valves off and the engine ran very evenly in both directions and very slowly - a timed 60 rpm . It does need a lot of pressure - far more than anticipated but I think I may be able to reduce that some. I finally fitted a gauge to my shed regulator and was very surprised to find the lowest pressure it would run on was 45psi
At a steady beat with the stop valve right open it was 65psi
. I would think it requires this amount of pressure because the cut offs are possibly too early - at a lower pressure there simply isn't enough volume of air to move the piston the full stroke.
So, I took another video only to just find that I didn't
It's obvious that what I actually did do was begin to record as I put the camera down
after taking the 'non video'!! You have a an 18.54 minute video of the corner of my gauge block case to the sound track of the much steadier engine beat but I don't think that will make for scintilllating coverage
You'll just have to take my word for it ..... Per?
So, I do feel I can now continue with the rest of the cosmetic parts knowing that it runs as well as I could wish for - I'll tweak the cut off to give a longer opening when it's all done.
Back soon then - another engine project is begining to look an attractive follow on but not until this is one is 'completely' done
Regards all - Ol Tug