[T2] water injection

[c.dreike]

One more point is that I have no dizzy, as the FI system performs the 
spark generation by way of a coil pack as in modern FI engines. I have 
full control of the advance function and air/fuel ratio via data arrays.

Chris

On 10/29/2016 6:52 PM, Robert Mann wrote:
> What carb do you have?
> The best place to slap in the water is, as I theorise, just outside 
> the throttle butterfly.  This is where a small hole takes vacuum (via 
> a nozzle at no predictable place on the carb body) for the dizzie.
> Actually it doesn't matter as much in practice on our engines, because 
> they are wide open nearly all the time.
>
> Keep in touch
>
> R
>
> On Sun, Oct 30, 2016 at 2:08 PM, c.dreike <c.dreike at verizon.net 
> <mailto:c.dreike at verizon.net>> wrote:
>
>     Robert,
>     I have read through your treatise on water injection and it seems
>     that I misunderstood where the injection should take place. I have
>     connected to a port on the throttle body which is below the butterfly.
>     Back to the drawing board.
>
>     Regards.
>     Chris
>     64DD Kamper Kit
>
>
>
>     On 10/29/2016 3:45 PM, Robert Mann wrote:
>>     My article <http://www.kuratrading.com/HTMLArticles/writings.htm
>>     <http://www.kuratrading.com/HTMLArticles/writings.htm>> mentions
>>     the sizes of needle which, on different carbs, give a suitable
>>     feed-rate of water / i.e./ approx 5% of the fuel consumption.
>>           Quote:
>>                         Often best is 0.71mm (22G) or 0.63mm (23G),
>>     but 0.8mm (21G) or 0.51mm (25G) is best for some motors.
>>
>>          If I convert 0.012" correctly, it comes to 0.3mm which is if
>>     anything too small.  I can't think where there would be a strong
>>     enough vacuum to suck thru that tiny restriction such a huge flow
>>     as you record.  I suspect one of us (?both) has made a numerical
>>     error.  Let us both check  ...
>>          My 1600dp has the Brazilian Weber (30mm choke).  The rubber
>>     joiner  push-fit onto the nozzle which provides the vacuum to the
>>     distributor has a 0.61mm needle stabbed in from the high side. 
>>     The rear L of the body provides a good spot for c. 3L of water. 
>>     If like me you are in a jurisdiction requiring official safey
>>     inspections regularly, you may be required to slap a floor into
>>     that water compartment; if so, perspex is best.
>>          Sorry to hear your oxygen sensor was crippled.  May it
>>     recover upon some more use?  BTW AFAIK the use of that component
>>     was invented by my sometime U of Auckland colleague Dr Geo
>>     Blanshard, who reasoned it was all very well to inject what is
>>     computed from the airflow, the accelerator position, etc, but if
>>     you fail to check what then actually results from combustion you
>>     are in a sense working in the dark.  I recall the sensor he
>>     slapped into the exhaust cost (c.1981) $200.  If yours does not
>>     recover from its chilling experience, I trust the replacement
>>     will by today be much cheaper.
>>
>>     Keep in touch
>>
>>     Robt Mann
>>     1973 1600dp Devon
>>
>>     On Sun, Oct 30, 2016 at 4:55 AM, c.dreike <c.dreike at verizon.net
>>     <mailto:c.dreike at verizon.net>> wrote:
>>
>>         Robert,
>>         I finally tried some water injection on my FI upright engine
>>         using your ideas. I need a smaller orifice to meter the
>>         water. I used one around .012". Sucked water like mad. About
>>         a pint in few minutes. Had to keep the engine reved up to
>>         prevent stalling.  Ruined my wide band O2 sensor. I suppose a
>>         smaller amount of H2O would not do the damage. What size
>>         needle did you use in your water injection exeriments?
>>
>>         Regards,
>>         Chris
>>         64DD Kamper Kit
>>         _______________________________________________
>>         type2 mailing list
>>         type2 at type2.com <mailto:type2 at type2.com>
>>         https://www.type2.com/lists/type2/listinfo
>>         <https://www.type2.com/lists/type2/listinfo>
>>
>>
>
>