Author: Bill VonDane <bill@...> Time: Mon Mar 1, 2004 2:40 pm PST Link
More on this subject... You got my interest peaked Jeff.....so I went
looking for installation manuals for different engine monitors that use the
FlowScan 201B... All of them said the following in one way or another:
- The flow transducer should be installed in the fuel line and mounted to a
horizontal surface as described below.
- A screen or filter should be installed upstream of the flow transducer to
screen out debris which could affect rotor movement or settle in V-bearings.
- As turbulence upstream of the transducer affects its performance, there
should be a reasonable length of straight line between the transducer inlet
and the first valve, elbow, or other turbulence producing device.
- Install flow transducer with wire leads pointed UP to vent bubbles and
insure that the rotor is totally immersed in liquid.
- For maximum accuracy at low flow rates the transducer should be mounted on
a horizontal surface.
I only found one that said anything about the actual location, and it said:
...has seen good results with the following mounting:
1. The transducer in a stationary location in line between the electric
boost pump and the engine driven pump.
2. The transducer in a stationary location in line between the fuel
injection servo and the distribution block.
3. The transducer in a stationary location in line between the Engine driven
pump and the Carburetor
I have a call into FlowScan for more info, but from what I have ready today,
I see no problem with installing where I did... When I hear back from
FlowScan I will update this post...
-Bill VonDane
EAA Tech Counselor
RV-8A ~ N8WV ~ Colorado Springs
www.vondane.com
www.creativair.com
www.epanelbuilder.com
----- Original Message -----
From: "pittsakro" <jfarrar1@...>
To: <rv8list@yahoogroups.com>
Sent: Monday, March 01, 2004 1:39 PM
Subject: [rv8list] Re: N8WV Upgrades...
Bill, I would advise against the location that you chose for the
flowscan. The flow meter is a point of restriction in the line.
When there is a restriction on the suction side of a pump, there
can/will be cavitation.....bubbles. It depends on the temp of the
fluid and the suction head of the pump. I believe that there is a
risk in your installation. I've got mine on the discharge side of
the engine pump w/ flex lines in and out, reasonably straight and the
error is less than 1%.
Jeff Farrar
N4ZJ 385hrs
EAA Tech Counselor
EAA Flight Adviser
--- In rv8list@yahoogroups.com, Bill VonDane <bill@v...> wrote:
> I decided to do some upgrades to my -8A, and have a new page on my
site that
> I will be posting the details to if anyone is interested...
>
> http://www.vondane.com/rv8a/finish/finish13.htm
> -Bill VonDane
> EAA Tech Counselor
> RV-8A ~ N8WV ~ Colorado Springs
> www.vondane.com
> www.creativair.com
> www.epanelbuilder.com