The system is meant to run under pressure to hold the water against the cylinder walls otherwise the water will boil away from the hottest point's,cylinder walls and cyl head,so not having the cap on will allow it to boil.
Air will cause the same problem as there is no heat transfer to cool it.
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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