PIERBURG 2E3
Figure
4
IDLEMIXTURE
SCREW
An alternative arrangement of separate idle fuel circuit with idle speed adjustment ot the
throttle bypass type, is shown in Figures
5
and
6.
In this type, idle speed is controlled by
a screw controlling the flow of air and fuel through a bypass channel, and not by varying
the positionof thethrottle plate. In such types, the idle speed adjustment and idle mixture
adjustment are usually located near to each other, on the same side of the carburettor.
On certain types, the bypass channel may have its own mixture adjustment (shown
dotted), for example some
Solex EElT carburettors. In this Solex twin carburettor, the
mixture to both barrels is adjusted using the mixture bypass screw, the two conventional
mixture screws normally remaining unaltered. It should be noted that with this type,
when the bypass screw is used
tochange theengine speed, the mixture is affected also.
It is therefore important to correct idle speed after each mixture adjustment, and to work
in small increments of adjustment. It should also be noted that when a throttle bypass
screw is fitted, the throttle stop screw will normally be locked or sealed, and in such units,
the throttle stop screw should not be disturbed.
Figure
5
Figure
6
IGNITION ADVANCE DRILLING
IDLEMIXTURE
PROGRESSION IDLEMIXTURE
IC0)SCREW
HOLES DISCHARGE
SOLEX
PDSl
IGNITION VACUUM
ADVANCE
PIPE
THROll'LEBYPASS
IDLEMIXTURE IDLE SPEEDSCREW
SCREW
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