Calif Bill wrote:
"Harry Krause" wrote in message
...
Shen44 wrote:
Subject: Continuos Duty Bilge Blowers
From: "K. Smith"
Not 100% true. I know of a number of installations that require a
constant
blower to assure positive air pressure within the e/r to cover all
engine
operating speeds.
Shen
Why?? Fuel or gas leaks?? (hope not)
Once the motor is running at some revs it's sucking in more air than
any blower is likely to move; indeed leaving the blower on at cruise is
robbing the motor of free air supply or at least trying to.
Assuming your engine room is reasonably well sealed, that could be part
of the problem for the blowers??? struggling against the inrushing air
trying to feed the motor??
K
Ms. Smith's boating advice is, as has been demonstrated here several
dozen times, not very good.
Neither is your or Shen's. A E/R blower sucks the air out. Not blow air
in. Therefore there should be at the most a slightly negative pressure.
But that's what I was alluding to Bill, most systems the blower is
designed to be off when the engine is at cruise revs, i.e. it's trying
to expel air from the e/r, whereas the motor wants as unrestricted a
flow "in" that it can get.
Without a specific reason as to why, I would still be asking why does
the blower operate "continuously"???
Anyway save the original questioner gives a reason (say the
manufacturer suggests, but that leads to even more questions)
No matter.
K