Angier,
I am replying without any bias, one way or another, at all.
1. Every flexible hose carrying fluid (including air) in the engine
compartment should be of Teflon or Teflon-like core covered with SS braid.
Their life is unlimited and this pays off in safety and future maintenance
costs. Mea culpa: I violated this with respect to the Electronic Ignition
implementation in that the separate restricted tap for its MAP is carried in
high-temp low pressure hose with slide on AN tube fittings.
2. Pick-offs for engine sensors (i.e. fuel pressure, oil pressure,
manifold pressure) should have a restriction built into the fitting
coming from the engine (or other T) so that if there is any failure downstream
from the tap, there is only a small adverse effect until a safe landing can be
made to repair the failure (uh, a pin-hole stream of oil or fuel is better
than a large stream and messing up one cylinder's MAP slightly is better than
messing it up a lot). I leave the construction or purchase of such
restrictors to your imagination and Google.
3. Fire sleeve should be used for all flex fluid lines in the engine
compartment (except perhaps for the MAP line), since one doesn't know where the
fire will come from. My original MAP sensor line (to a VM engine
monitor) is fire sleeved for sake of symmetry.
Others will have other opinions.
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
Pilot
not TSO'd, Certificated score only > 70%.
In a message dated 2/18/2008 1:46:54 P.M. Central Standard Time,
N4ZQ@comcast.net writes:
The time
has come to fabricate hose connections from engine to
firewall for
oil and fuel pressure transducers as well as manifold
pressure. The
male fittings on engine/firewall are aluminum 2D. The
pressures here
are low so not sure if Stratoflex 156 hose and fittings
would be
appropriate so I'd appreciate suggestions here. Also, are
hoses used
for this application normally covered with fire sleeve or
not?