Hi Guys,
As they say 'Allo Allo'. "Please listen I shall say this only once - there
is NO restrictor in the return fuel line on a Europa/Rotax 914 installation"
regards,
Mike
----- Original Message -----
From: "Ronald J. Parigoris" <rparigor@suffolk.lib.ny.us>
Subject: Europa-List: 914 fuel restrictor info
<rparigor@suffolk.lib.ny.us>
>
> Hey Guys
>
> OK kinda sortta have a better handle on 914 carburation. First off a turbo
motor
> will run with very little fuel pressure, like gravity feed. It will only
run
> however at ambient pressure or less. If you boost the motor will quit. The
reason
> is if you boost the pressure in the venturi, it will blow through main and
needle
> jets! You need to keep the pressure in the float bowl above that of the
boost to
> allow Berneulli to suck.
>
> They have a fuel pressure regulator to handle this task. If it fails and
fuel
> pressure drops, you may be able to continue to make noise if you throttle
back to
> ambient pressure or less.
>
> The restrictor provides backpressure and return flow to fueltank. If
restrictor
> clogs, fuel pressure regulator would still operate, but you may cause
cavitation
> in the fuel pump/s. Even though the regulator is only allowing the correct
> pressure to get to the float bowl, if you had a fuel pressure guage at the
pump,
> you would see a rise in fuel pressure. Vapor lock could occur with no
excess
> flow. He said you should have a fuel pressure guage on all 914
installiations.
>
> Phil Lockwood said he dosen't think he has seen a full blockage. Partial
usual
> makes motor run terrable. He said blockage is rare. On inital assembly not
a bad
> idea at all to blow out fuel lines, and prior to install of restrictor, to
let
> fuel pumps run and let a gallon or so of fuel to run through system.
>
> There ya have it. A 914 is not fuel injected, you just need to turbocharge
the
> float bowl a bit over full boost pressure so the venturi works.
>
> Ron Parigoris
>
>
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