Fw: [Diy_efi] compression ratio

[Axel Rietschin]

OK, cool. Now 70% of fuel mass is a lot of water to carry around ;-) It all
depends of the application, of course, as someone else always says :-)

Now, the ratio I'm used to is more typically around 20% and it serves my
purposes well, of course and as usual, your mileage may vary...

--Axel

----- Original Message -----
From: "Greg Hermann" <bearbvd at mindspring.com>
To: <Diy_efi at diy-efi.org>
Sent: Wednesday, May 08, 2002 3:00 AM
Subject: Re: Fw: [Diy_efi] compression ratio


>
> At 12:53 AM 5/8/02, Axel Rietschin wrote:
> >From: "Greg Hermann" <bearbvd at mindspring.com>
> >> >> > BTW... ive heard that the maximum water that can be injected
before
> >> >> > water-lockup can occour is 50% of fuel.
> >> >>
> >> Apparently you have a good source for urban legends---
> >
> >Water-lockup is indeed probably a little further away ;-) but 50% of fuel
> >mass was indeed experimented by someone (Harry Ricardo? - I don't have a
> >quote handy so please don't ask) and is most probably the most water you
> >ever want to inject.
> >
> >This may be helpful:
> >
> >http://retro.co.za/efi/DIY_EFI/2000/efi5-039.txt
> >
> >
> >--Axel
>
> 70% of fuel mass flow is a bit closer to the theoretical maximum (optimum)
> H2O flow rate which is beneficial--as supported both by thermodynamic
> calculations (the maximum increases somewhat as compression ratio
> increases). and by Sir Harry's work.
>
> Sir Harry went quite a bit FURTHER than the optimum, proving also that
> water flow above the optimum simply results in reduced power and
> efficiency, not in engine damage!
>
> Greg
>
>
>
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