Fw: [Diy_efi] compression ratio

[Greg Hermann]

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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