Fw: [Diy_efi] compression ratio

[Mark Williams]

Lots of people on special occasions also mix alcohol/methanol in with the water
to give the boost your talking about.  Ive heard of poeple using up to 50%
alcohol in the water mix, but i guess theres no reason why you cant use more if
everything is tuned to it properly.

By Grant Beaty, on Wed, May 08, 2002 at 11:29:50PM -0400:
> Wow, thats a lot of water. I know this is a bit OT (the thread is anyway),
> but if you spray water evenly into all cylinders, can it take the place of
> fuel? That is, could you theoretically run 14.7:1 at WOT, spraying water for
> cooling instead of fuel? My setup will be 2D mapped, so I can take out fuel
> and the water injector's duty cycle increases.
> 
> My car is limited by octane. And if I increase the octane, its limited by
> injector. I'd really preffer to kill two birds with one stone and spray
> something into the motor that will effectively increase the octane and
> richen it up at the same time. Alky looks nice, but it seems more volume
> must be sprayed for it to be effective (compared to water).
> 
> Thanks,
> Grant Beaty
> 
> -----Original Message-----
> From: Axel Rietschin <axel_rietschin at compuserve.com>
> To: Diy_efi at diy-efi.org <Diy_efi at diy-efi.org>
> Date: Tuesday, May 07, 2002 9:44 PM
> Subject: Re: Fw: [Diy_efi] compression ratio
> 
> 
> >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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> >
> >
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> 
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