Subject: Continuos Duty Bilge Blowers
From: "Calif Bill"

"Harry Krause" wrote

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.


G Not 100% true.
I'll leave it to the engineers to explain, but, in many installations you'll
find both intake and exhaust blowers.
In one particular application, they upgraded from "naturally aspirated" to twin
turbo's per engine which created that slight negative pressure you mention,
causing loss of peak power and RPM's.
In this case, the natural venting couldn't supply sufficient air and blowers
needed to be added to solve the problem.
BG had a hell of a struggle opening the door to the e/r to begin with.

Shen

Not on an under 25' boat. Especially one that runs a 3" or 4" e/r fan.

"Shen44" wrote in message
...
Subject: Continuos Duty Bilge Blowers
From: "Calif Bill"

"Harry Krause" wrote

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.


G Not 100% true.
I'll leave it to the engineers to explain, but, in many installations
you'll
find both intake and exhaust blowers.
In one particular application, they upgraded from "naturally aspirated" to
twin
turbo's per engine which created that slight negative pressure you
mention,
causing loss of peak power and RPM's.
In this case, the natural venting couldn't supply sufficient air and
blowers
needed to be added to solve the problem.
BG had a hell of a struggle opening the door to the e/r to begin with.

Shen

Subject: Continuos Duty Bilge Blowers
From: "Calif Bill"
Date: 05/23/2004 11:08 Pacific Standard Time
Message-id: et

Not on an under 25' boat. Especially one that runs a 3" or 4" e/r fan.


This may normally be true, but, if their is a reason for requiring a
"continuous duty" blower on ANY size boat, the "continuous duty" may be for
some reason other than exhausting "flammable" vapors.
Hence the comment, "not 100% true", as there are other possible reasons that a
particular installation may require something other than your norm.....
maintain a positive pressure, exhaust excess heat, etc.

Shen