You have uneathed a whole problem that prob affects 90% of water injection users out there. I have a similar prob im working on. The problem is the differance of the high presure air on the outside of the bend and the low pressure on the inside in my case.
So in your case the air will flow to the farthest cylinder best and the nearest the least. This is gonna leave you short in that cylinder. Even if you have a collector which then divides into 4 you would still suffer. The main problem as far as i can see is that the manifold is designed to flow air not WI as well. You would see the prob more if you were running a AIC down stream and a egt per cylinder. I know Lotus have flow bench equipment but private work is a strict no no........ i need to ask some of the guys when im there about this....I have a better pic using my car of what your problem is.
Scott
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RX7
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