Engines > Restoration of Model Engines
Two Uniflow Engines
Jasonb:
The G1 Uniflow is quite a chunky engine of cast iron construction and quite large for the cylinder size. The steel crankshaft runs straight in the iron, dural piston and conrod.
As mentioned the main problems preventing it from running were that the cam was in the wrong position but mostly that the pushrod was not locked into the top of the tappet so valve lift was altering as the engine was being run. I did not run it at full generating speed as there is no oil in the crankcase and no lubricator but a few drops of oil are enough for short test runs and all seems well with it starting fairly easily. The owner can sort out the damaged regulator valve when he gets the engine back.
http://www.youtube.com/watch?v=Pl4YDlsa5V0
Jasonb:
The Basset Lowke Uniflow would only run with a small bleed hole open. A complete strip down did not reveal much but the flywheel was not particularly tight. It ran Ok once put back together with a temporary screw plugging the bleed hole. I can only assume that as these engines have quite a kick when the valve opens that the crank was rotating but the flywheel was not picking up speed and just slipping so had no initia to carry the piston back up and compress what air was left in the cylinder unless it could come out the bleed hole.
The drawings posted earlier show the crankcase stopping at the bottom of the cylinder and the steel cylinder exposed but this engine is like the one in the full steam plant photo where the casting encloses a steel cylinder liner and a passage around the exhaust holes directs the steam to a single exhaust pipe.
Again I did not push it to the speeds quoted in the old magazine articles but am happy with how it now runs.
http://www.youtube.com/watch?v=ngkoS2YftCI
Sanjay F:
Brilliant, 2 x fantastic looking engines brought to life, well done :popcorn: :ThumbsUp:
I'd like both of them ;)
PaulR:
--- Quote from: Jasonb on May 04, 2026, 07:48:31 am ---I can only assume that as these engines have quite a kick when the valve opens that the crank was rotating but the flywheel was not picking up speed and just slipping so had no initia to carry the piston back up and compress what air was left in the cylinder unless it could come out the bleed hole.
--- End quote ---
Great bit of detective work! I really like these two and especially the sound.
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