Orbital Air Injector Piece Almost Here, I Think!

[Greg Hermann]

Hi All--

Been some prior talk about this recently--those of you who chatted about it
with me will know who you are---I finally got down to the Denver area
Monday. Managed to find a friendly parts guy at a Mercury Marine dealer.
The parts fiche picture (for the Merc DFI 200 motor) was not particularly
clear, but the price for an "injector" looked wrong enough to be the right
item ($176 USD for one, as I recall), and the guy was willing to order me
one, and even said he would return it if it turned out not to be the right
thing.

Anyway--he called. It's there. Goin' onto UPS Monday. Be here Tuesday.
Someone's gettin' excited. Particularly cuz when the Merc parts guy called
today, he called my piece an "air injector nozzle"! Now all I gotta do is
hold it in my hot little mitts an' see whether I think it can be adapted
mechanically so as to use it for air boost atomization for port
injection!!!!

I think I at least got the Orbital "air boosted injector" part. (That was
more than a bit of a grope, just going by the Merc parts fiche.) Time will
tell, but setting up a flow test will be the next step, I suppose. (Fingers
crossed, and panting!) Think I will flow it on H2O so as to get a
conventional Cv constant for it.

In the (US) controls industry a "Cv" constant of 1.00 means 1 gollon per
minute of water flowing across an item will experience a pressure drop of 1
pound per square inch (I forget the test temp, off the top of my head).
This is pretty much an industry standard kind of a number, so that is where
I would like to start with this puppy. Yes, there are magical mathematical
ways to convert the flow constant for a part (based, as it is, on water
flow) to determine how said part will behave when flowing other fluids,
both liquid and gaseous. Metricly oriented folks use a constant analogous
to our Cv which is called "Ks" , and which is based on metric flow and
pressure units (and water).

The Merc parts guy was kinda interested in what I was up to--a little
apologetic about the price, he muttered something about "And that would be
times six!" , and then looked at me with a grin and said "Naahhh--I bet
it'll be more like times eight for what it sounds like you're up to!!"

Will keep you all posted on further developments. :-)

Regards, Greg