Rob,
At my speed of 200 Kts, the max ram air rise is 2" Hg or about 1 psi.
At your speed of about 248 Kts, the max ram air rise is about 3" Hg or 1.5
psi. The upper cowl pressure is always going to be less than that
generated by good ram air into the induction system, thus the induction "deck"
pressure may be great enough to limit the vaporization thru an injector or, as
in your case, even cause fuel to be forced out of the injector body "air
intake".
Below is another way this can be overcome using a separate ram intake
for the bleed air. The little tap into the distribution plenum was to
measure the effectiveness in with cockpit located instrumentation.
The ram intake:
The plenum and distribution to each shrouded injector:
Scott Krueger
AKA Grayhawk
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL
(KARR)
"...as we know, there are known knowns; there are things we know
we know. We also know there are known unknowns; that is to say we know there are
some things we do not know. But there are also unknown unknowns - the ones we
don't know we don't know." D. Rumsfeld