water injection

[Todd King]

     <<<
     Isn't one of the effects of water injection to absorb the heat as it 
     changes form water to steam, thereby providing some sought of 
     intercooling effect in the combustion chamber anyway, so even if it is 
     not that cold, it will still have an intercooling effect....   >>>
     
     Absolutely; in fact this is where the benefits come from. The heat of 
     vaporization is huge for water; it absorbs alot of heat to transition 
     to steam. Also similar to why N2O works well. It takes alot of heat 
     input to seperate the O from the N2 which causes an intercooled 
     effect, as well as freeing up extra O for combustion of more fuel.
        Any theories on why batch fire doesn't pop at wot vs sequential 
     which often does on the turbo Buicks? It's really confusing. I've 
     directly measured inj duty cycles at wot in SFI mode and they ran all 
     the way up to > 99.5% for 720 deg rotation. But a "pop" often implies 
     a lean condition. How could multiport exceed the above SFI fueling 
     with all 6 inj on at ~ 100% dc? It can't- so what the heck can be 
     going on here?
     
     Todd- currently bewildered...         todd_king at ccm2.jf.intel.com