Hi Guys i have finished my 10v which turns over very nicely. However I have made a simple pot boiler 2" by approx 3" long and connected to the engine. However it seems I am unable to generate enough pressure!! The engine will turn for a few revs but then simply stops. until pressure builds up. I have connected both with a short lenght of eight tubing. with no leaks. I am using a blowlamp to boil the water so there is plenty of heat. Any advice would be appreciated Alan
Hi Alan. First thing I would suspect in a double acting engine like that (I built one once) is steam leaks past the piston: they won't be obvious like a leaky pipe connection. As designed it uses an oil groove, but I increased the slot depth on mine to take packing and it improved it no end. Regards JB
I am using a blowlamp to boil the water so there is plenty of heat.
There is enough heat, but does it end up where you want (need!) it? If it goes up the stack it's lost. I don't know how large that 10v is, but a pot of those dimensions doesn't have much heating surface. Maybe add some circulation tubes or porcupine quills.
In addition to the comments already, another problem is a 2x3 boiler doesn't have sufficient steam reserve space and even when forced (aggressively fired) the steam supply is quickly depleted, as you experience. The smallest boiler Stuart sold to demonstrate (as opposed to working) this engine is about 2.5x8 and was fired by a large spirit burner. In this particular case, size does matter.