Fw: [Diy_efi] compression ratio

[Grant Beaty]

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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