[Diy_efi] boosted compression ratio

[Bill Washington]

Bernd,
	Just an idea, and I dont know if it would be suitable, but has anyone considered those little ultrasonic foggers that are used for effect in some water features? I would think that they are putting very small water particles into suspension in the air, and if located adjacent to the air intake would be drawn through the induction system with the air. There is no heat involved, only mechanical vibration, so the water should be atomised rather than evaporated, but I have no idea what their rate of atomisation is, or if it is adjustable.




Message: 11
Date: Sun, 22 Dec 2002 21:52:25 +0800
From: Bernd Felsche <bernie at innovative.iinet.net.au>
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] boosted compression ratio
Reply-To: diy_efi at diy-efi.org

>Still trying to get a cheap inlet fogger together; that should do
>> >the trick. In winter, I'd have to heat the fog so that the air
>> >temperature rises as well. At 8 degrees C, air is saturated with
>> >only about 8 g of water per kg of air. Heating the air to about 25
>> >degrees increases that to about 20 grams. That's worth 3 Octane
>> >points; but the temperature rise reduces the effect by 1 to 2
>> >points. <sigh>
>
>  
>
>>> But hang on, you dont want water vapour and you dont want too
>>> small a droplet size otherwise it will become vapour by the time
>>> it gets to the cylinders. I dont recall what boost you were
>>    
>>
> Yes I DO want water vapour. Check the Gasoline FAQ. It deals with 
> humidity - absolute humidity is what appears to be significant in 
> inhibiting knock.




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