[T2] water injection

[Robert Mann]

My article <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> 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
> https://www.type2.com/lists/type2/listinfo