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----- Original Message -----
Sent: Sunday, January 23, 2005 8:53
PM
Subject: [FlyRotary] Re: Ah Ha! Pressure
Regulator Problem?
In a message dated 1/23/2005 5:05:26 AM Pacific
Standard Time, eanderson@carolina.rr.com
writes:
Hey Bill,
I appreciate all the help I
can get - different insight/experience is what makes sharing information on
this list so useful. It certainly seems that the return capability of
this regulator could be less than required to properly regulate pressure
referenced to manifold. I had assumed that since MSD advertised their
High pressure pump and regulator together that they would work
together. And the regulator may indeed increase fuel pressure/flow if
presented with boost pressure (above ambient) - just don't know since I
don't have a turbo.
Thanks again
Ed A
Ed,
There are two parts to this equation. First: Does the regulator flow enough by
itself. Second: and almost as important is the plumbing itself. Some people
will use very small return plumbing. That plumbing can restrict flow, keeping
the fuel presure high. Another thing for the new people to remember, be sure
your return switches with your tank valve. There have been accidents where the
return flow wasn't switched and the tank ran dry. (Always on final of
course)
Bill Jepson
I agree Bill, I used the same -6 line for return as
for main flow, so that shouldn't be a problem. My return line is to a
small (1 pint) header tank on the firewall, so no return line to main tanks to
switch. Has worked well for 260+ flying hours - but, a change I would
make would be to put the header in the wing root or someplace other than under
the cowl due to heat and possibility of vapor lock. The combination of
blast air tube to the fuel components and a boost pump (to pressurize the
header if needed) keeps that at bay.
Ed A
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