Triumph TR6 PI Operation Manual page 149

FUEL SYSTEM PI
Description of the Petrol Injection Circuit and
Components Petrol Injection Circuit.
The Lucas Mk. 11 petrol injection equipment used on
the Triumph TR6 engine replaces carburetters as a
means of inducing a combustible petrol-air mixture
into the cylinders. .
Essentially, the system consists of a pump, a pressure
relief valve and a metering distributor, the latter
delivering precisely timed and measured quantities of
fuel to six injectors housed in an induction manifold.
A normal petrol-air mixture is then induced, and
compressed and ignited by a conventional ignition
system.
Fuel, gravity fed from the tank to a paper
element filter is drawn into an electrically driven
pump which delivers pressurised fuel to a metering
distributor via a pressure relief valve. The valve, which
is adjustable, maintains a constant pressure of fuel to
the metering distributor and releases excess fuel
pressure back to the tank via a return pipe. The
metering distributor, controlled by vacuum from a
pipe to the induction manifold measures, subject to
engine requirements and delivers a charge of fuel to
each of the six injectors at the commenceme.nt of the
induction stroke of each piston. The injectors, housed
6
7
in the induction manifold, contain a poppet
valv~
which is set to open at 50 p.s.i. (3'52 kgf cm
2 )
and
allows a charge of fuel in the form of a hollow cone
spray into the induction manifold. Fuel which also
lubricates the metering distributor is returned to the
tank via the lubricating fuel return pipe.
19.35.00
PETROL INJECTION SYSTEM
General
~scription
3
I
o
5
--
---
2
-
--
4
5.
Metering distributor
6. Vacuum control pipe
7. Injector pipes
8.
Fuel tank
--
--
l. Filter
2. Pump
3. Pressure relief valve
4. Lubricating fuel return
8
I
NT0326
Triumph TR6 ManuaL Part No. 5'U277 lIS"" I
19.35.00 P.I. Sheet 1