[Diy_efi] higher pressure pumps for water injection

[Chris Conlon]

At 12:29 PM 8/1/02 -0400, Eric Fahlgren wrote:
>Chris Conlon wrote:

>> and one set of tests someone just pointed me to went up to 2:3
>> fuel to water with considerable benefit. At the very least I'd
>
>Wow, Chris, is this a typo?  Really half again more water than fuel?
>What sort of engine, how much fuel, how was water delivered?

Not a typo, though 1.5:1 water:fuel was not necessarily optimum in
all respects and all cases. The tests used one cylinder of an air
cooled aircraft engine, with very large cylinders (for gasoline
anyway), and many tests used 80 octane. Thus my feeling is that WI
may have given more benefit than on a water cooler, smaller engine
running say 93 octane. The tests mainly tried to find max allowable
BMEP vs. water. 1.5:1 water:fuel was as high as they went but that
rate definitely allowed higher BMEP than lower amounts.

http://naca.larc.nasa.gov/reports/1943/naca-report-756/index.cgi?page0001.gif

The thing that most impressed me was the safe use of lean mixtures
in combination with lots of water, under significant boost.

Thanks go to Ed McGuirk for pointing me to that specific report.


   Chris C.


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