25-03-2019, 12:45 PM
Not sure if anyone has tried using a fluid - being incompressible it is not 'springy' - and it would rapidly escape past the rings (and the valves when pressure was applied)?
With the rope trick, though I have not used it, I would imagine that you could work out the approximate length of the rope needed from estimating the volume as length x cross-sectional area - and then, say, doubling it because it would not pack efficiently. The max volume of a cylinder is known - about 200cc. If the rope is 5mm diameter, it is 4cm length per cc, or 2cm per cc with a 50% packing factor. A stick down the plug hole will shown how far down the piston is so the initial amount of rope can be estimated.
More or less rope can then be inserted depending on whether the engine turns over easily or jams? The advantage of rope is that it is soft and squashy, whilst being resilient and retrievable? Persumably someone has tried this in the past?
When I brought up my stuck cylinder head as a problem in 2009, it was suggested that I check I had removed all the nuts... it is hard to imagine that this could be such problem, but the head on my car had been in place since before 1970. It still came off eventually, and a couple of times since.
Colin
With the rope trick, though I have not used it, I would imagine that you could work out the approximate length of the rope needed from estimating the volume as length x cross-sectional area - and then, say, doubling it because it would not pack efficiently. The max volume of a cylinder is known - about 200cc. If the rope is 5mm diameter, it is 4cm length per cc, or 2cm per cc with a 50% packing factor. A stick down the plug hole will shown how far down the piston is so the initial amount of rope can be estimated.
More or less rope can then be inserted depending on whether the engine turns over easily or jams? The advantage of rope is that it is soft and squashy, whilst being resilient and retrievable? Persumably someone has tried this in the past?
When I brought up my stuck cylinder head as a problem in 2009, it was suggested that I check I had removed all the nuts... it is hard to imagine that this could be such problem, but the head on my car had been in place since before 1970. It still came off eventually, and a couple of times since.
Colin