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Ford 4.0L 6 Cylinder
SOHC and DOHC Long Engines
Although we have been building high performance
engines since 1978, it wasnt until 2004 that we
began development work on the Ford 4.0L DOHC 6
cylinder Barra turbocharged engine. We
witnessed numerous catastrophic engine failures
after consumers had undertaken simple
modifications such as free flowing exhausts and
cold air intake systems, so it became apparent
there was a need for us to engineer some
solutions to address the inherent factory
weaknesses.
The engines possess an abundance of untapped
power with their large (factory fitted) Garrett
GT35/40 turbocharger, however because the engine
internals are almost directly taken from the
original inline 6 cylinder NA
(normally-aspirated) engine of the 1960s, they
were not designed to handle 21st century
boost-assisted power levels.
We initially developed a lightweight yet durable
billet conrod to work with the 99.31mm (almost
4) stroke crank and before long our customers
were making 450+ RWKW (700+ flywheel HP).
Following this various other engine weaknesses
came to the fore such as oil pump problems,
valvespring tension, excessive torsional
moments, crankcase flex, inadequate cylinder
head retention, airflow distribution problems at
high boost etc and engineered a range of
solutions to suit.
We have seen power levels in excess of 1350KW
(1800+HP) with our engines and components, such
is the scope for power from these big cube 6
cylinder power plants.
We have 3 power levels available; new for 2014
is our StreeTorquer 550 engine, designed for
hi-performance street cars; the venerable
698GT-A engine has been upgraded for 2014 with a
few new tricky bits and finally for the
seriously power crazed, our 998 GT-R is just the
ticket!
MY2014 Atomic StreeTorquer 550 Long engine
specs
Ultrasonic tested
seasoned Ford block the thickest walls are
required (we reject 4 in 10 for being like
Cleveland blocks - too thin in spots due to core
shift)
Full crankshaft preparation - magnafluxed,
stress relieve/temper, checked for index/stroke,
reground and micropolished journals and
chamfered oil holes.
Atomic forged pistons 8.7:1 comp ratio and
include coated skirts, anti detonation bands and
H/D pins
Nitro carburised steel turbo rings
Atomic billet StreeTorquer conrods #306202
550 Kw 6.060 C/C, bushed for floating pins,
ARP 2000 bolts and cylindrically ground/honed
tunnels.
ACL/King Competition bearings
Fully machined block inc torque plate honed
cylinders, decked to crank centreline, main
saddle alignment checked etc
Bearing clearances set up to suit the intended
usage
Fully prepped (seasoned) Atomic Stage 3
cylinder head with 7 angle CNC machined valve
job and hand porting of inlet and exhaust bowl
areas. Fine Ra finish on deck surface, chambers
relieved, spring tensions set up and new PC
seals fitted.
Lifter preloads set
Atomic H/Duty Simplex timing chain #306620
Atomic Induction hardened crank sprocket
#306562
Atomic Hi-pressure timing chain tensioner
#306563
Precision balanced
Atomic Hi-Mass Street Performance balancer
#306102
Atomic H/D Conical valve springs #306800
Atomic Head stud kit - 12mm #306651
Atomic Billet gear oil pump complete with
EDM cut chrome moly gears #306750, Grade
10 fasteners, high flow bypass circuitry and
blueprinted clearances.
Atomic chrome moly timing guide pivot
#306564
Atomic gasket set inc SLS Teflon coated head
gasket and Viton crank seals
M14 Hi-Tensile Harmonic balancer retaining
bolt and chrome moly washer
Fit new brass welch plugs
Spray block grey in hi-temp engine enamel (or
any other colour you prefer)
Powder coated rocker cover your choice of 6
colours
Precision blueprinting and assembly of long
motor
Engine is fully test run in our engine test
cell - verify all vitals of the engine (oil
pressure hot and cold, ring bed-in, cylinder %
leak down, lifters bled, etc) and full report
supplied.
Supply torque specs manual, run-in procedure
sheet and DVD of engine operation on test bench
Supply 7 litres of Run-in 15W/50 oil
Supply genuine Ford oil filter
12 months conditional warranty
A long engine is complete from sump to rocker
cover and all engines are partially run-in on
our engine test cell to ensure everything is
100% spot-on before shipping.
StreeTorquer 550 Series Long engines Non
exchange
#306390 DOHC Ford 6 cyl - BA Ford
#306391 DOHC Ford 6 cyl - BF Ford
#306392 DOHC Ford 6 cyl - FG Ford
StreeTorquer 550 Series Short engines
Exchange
#306389-RB SOHC Ford 6 cyl - AU Ford
#306390-RB DOHC Ford 6 cyl - BA Ford
#306391-RB DOHC Ford 6 cyl - BF Ford
#306392-RB DOHC Ford 6 cyl - FG Ford
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