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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