Air Tight

[RMMK]

I am unsure whether the pulse jet needs to be airtight without any small openings between the combustion chanmber and the head assembly.... I think using flanges might also result in small space?? Is it okay or should it be completely closed because of we blow air inside for starting the same some air will leak out from the same area?? Will it work still???

[metiz]

Make it as airtight as possible. All leaks will decrease the likelyhood that your engine will run