It should help
I think it would help for two reasons;
First a blower is a postive dispacement pump, for a given rpm, it can only move so much "volume", by cooling the charge entering the blower it will move more air (mass) at the same rpm. Since air mass is the important factor its a good thing. I found a web page some time back that mentioned an experiment that Kenny Bell ran to prove that intercooling before a blower increases air flow but intercooling after a blower has no effect on mass flow, only higher density due to cooling but lower boost and a minor gain due to improved detonation resistance.
On the sealing, there is good reason to say yes to that. For years in drag racing they injected the fuel ahead of the roots blower to both cool it and to act as a fluid seal. They had problems with the idea only because of the explosive nature of Nitromethane. If the engine back fired through an intake valve, it would blow the entire top of the engine off, because you had the intake manifold and pressure side of the blower full of fuel air mix.
That should not be a problem for a water injection system as water methanol mix is much less explosive than nitromethane. One other solution to the blow up problem was to put blow out reliefs in the pressure side of the blower manifold. If it back fired and the fuel air mix ignited, the high pressures would blow out special safety disks rather than lift the intake manifold and blower 30 ' in the air.
The extra cooling also allowed them to run tighter clearances in the blower which also helped reduce leakage past the rotors.
Larry
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