Cell configuration???

[NZHHO]

Vertical wet Cell:

- + - + - + -

How many neutral plates in between would I need to run between 12-13V?

Is voltage leakage really an isue that needs addressing? If so what should I use to seal plate edges. eg. epoxy, high temp silicone etc.?

[pdai11]

Best is to place at least 3 neutrals at each plate, best is four.

[Bud]

if you the right plate spacing and the right amount of neutral plates in your cell your voltage should not be over 1.24 volts per cell any more than this is creating steam and not hho. you do not want steam in your engine this would not be a good thing.
good luck

[HHOGasKitWizard]

everything really depends on how much spacing you have between your plates if you could get us a good pic we may be able to help you more.