Lotus TURBO ESPRIT Service Manual page 367

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SECTION LC
Page
9
Power Jet Operation
A t high engine speeds, an additional amount of mixture flows through the
needle
jet
(52),
upstream the inner venturi (50); mixture is composed of fuel drawn from the float
chamber through channel
(56)
and metered
by
the jet (55), mixed with air metered
by
the calibrated passage
(54)
and drawn from the float chamber top (53).