28 CARMAGAZINE.CO.UK | APRIL 2019M
ost recently it was Mercedes, now Jaguar Land Rover
is switching back from a V6 to an inline six-cylinder
petrol engine – the configuration once used by the
likes of E-Type and XJS. The new 3.0-litre turbocharged unit,
which features 48-volt mild-hybrid technology, makes its debut
in the new Range Rover Sport HST (pictured above), and replac-
es the previous 3.0-litre supercharged V6.
Effectively a four-cylinder with two extra cylinders, the new
inline-six represents a logical extension – literally – of JLR’s
modular four-cylinder aluminium Ingenium engines, intro-
duced in 2015 and produced at the company’s Wolverhampton
engine manufacturing plant. Benefits compared with a V6
include fewer parts – an inline-six has a single cylinder head,not two – economies of scale unlocked by sharing parts with
the smaller Ingenium engines, and smoother power delivery.
The inline-six’s combination of 83mm bore and 92mm stroke
is identical to four-cylinder Ingenium engines, and output is
boosted by a twin-scroll turbocharger plus another compressor
driven by an electric motor, which helps eliminate lag. Power
peaks at 395bhp, torque at 406lb ft, where JLR’s beefiest super-
charged V6 currently makes 375bhp/339lb ft in the F-Type.
Fuel efficiency is boosted by a 48-volt mild hybrid system. It
harvests energy under braking, stores it in a battery, and can
redeploy it, for instance when moving away after the stop-start
system has killed the engine at the lights. Land Rover quotes
24.5-26.7mpg and 213g/km on the new WLTP test cycle.
The engine itself is 20kg lighter than the old V6, but that’s
cancelled out by the extra weight of the mild-hybrid technology.
Other JLR models continue to use the V6 supercharged en-
gine and turbodiesel V6s too, but inline Ingenium sixes are set
to be phased in universally over time. Higher up the foodchain,
BMW-sourced V8 bi-turbos will replace today’s Ford-sourced
supercharged V8.Not as
compact as
V6, but switch
to aluminium
saves weightLand Rover’s
BMW beater
Straight-six engines are BMW territory – but no one
told JLR. Meet it’s ultra-efficient new six. By Ben BarrySTRAIGHT AND TRUE
HOW IT WORKSCAR
explains
Tech
VARIABLE VALVES
CVVL (continuous variable
valve lift) reduces pumping
losses by varying inlet valve
timing and lift, maximising
efficiency in combination
with VCT (variable cam
timing) which optimises
both intake and exhaust
camshafts.WHY A STRAIGHT SIX?
Advantages of inline-six
engine include fewer
parts than a V6, plus a
smoother, more refined
power delivery. Ingenium
six is all-aluminium, with
roller bearings on the
camshaft and balancer
shaft, plus variable coolant
and oil pumps.HST PACKAGE
Aside from the new
engine, the £81,250 HST
also gets carbonfibre
exterior trim, multi-
adjustable front seats,
suedecloth on the steering
wheel and gearlever, red
brake calipers and extra
electronic safety aids.TURBO TIME
3.0-litre engine is boosted
by twin-scroll turbo, plus
an Audi SQ7-style electric
compressor designed to
fill the small amount of
turbo lag still experienced
in modern engines – it’s
claimed to fully spool
up to 120,000rpm in 0.5
seconds. Total output is
395bhp and 406lb ft.LONGER STROKE
3.0-litre capacity is
unchanged from outgoing
supercharged V6 engine
but bore is smaller at 83mm
(down from 84.5) and stroke
is up from 89 to 92mm. The
longer stroke lends itself to
torquier, less revvy delivery.MILD HYBRID
48-volt system harvests surplus
energy under braking, stores it
in a battery, and redeploys it for
smooth, quick engine restarts
during stop/start driving, which
contributes to cleaner, more
economical running.