Water injection questions

[Tony Bryant]

> 
> How much benefit might be produced in a non-turbo, stock motor. I'm think purely 
> of the charge cooling and increased charge mass. Could this produce significant 
> gains used with enrichment at WOT? Roughly how much water would be required per 
> volume of air? How much ignition advance would be required ?
> 
I haven't experimentally verified it, but my simulations tell me that 
the presence of water has the effect of cooling the peak cylinder 
temperatures. In other words some energy that is normally going into
driving the piston, is now heating up some water. i.e. less power
because your engine is now becoming a petrol powered steam generator, 
instead of an engine. 

Excess fuel does exactly the same thing (which is why it helps
prevent knocking), fuel may be more expensive than water, but 
the fuel injection hardware is already there.

IMHO the only use of water injection is cooling the intake charge, 
and even then a cold air/ram air box & a decent or no filter is probably
more effective.

As for volume of water & advance, I can't help....



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* "Insanity is the only sane response to an insane world" *
*                 >> bryantt at fp.co.nz <<                  *
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