CRAMPTON CUSTOMS
So far, boost has been cranked to 22 psi on pump
fuel with more development to come. No dyno figures
as yet as the bike has only been tuned on the side of
the road so far but they say it has a “ton of torque
and pulls like a train!” The boys have found running a
conservative 15 psi on the street is working out fine.
An electric oil scavenge pump was added due to
the Shovelhead engine producing excessive back
pressure in the crankcase (a factory feature). The
scavenge pump now returns the turbo oil directly
to the top of the custom oil tank.
The custom manifold has also been recently
changed by adding a flexible joint in the rear header
pipe. This was done dbecause the Shovelhead
motor was actually moving with expansion, caus-
ing issues with the manifold mount. This kind ofmodificationcomes under the heading of ‘blasting
through obstacles’ that I mentioned earlier.
An Ultima 2in open primary connects to an Ultima
five speed transmission and chain drive back to an
Exile sprocket brake where the rear brake and final
drive sprocket are combined into one unit. And there
is more, much more we could expound upon but
space limitations mean it is best covered by running
your eyes over the very extensive Guts&Bolts table.
It’s hard to imagine the time and effort that
has been poured into this unique custom, and the
brain-sapping problems that had to be overcome.
But man, the result! I’m sure if you asked the boys
the five years labour of love has been worth it the
answer would be a resounding “hell yeah!” And at
HEAVY DUTY we can only wholeheartedly agree! HD UTS&BOLTS
GENERAL
MAKE Crampton Customs
OWNER Ben Crampton
BUILDERS Luke & Ben Crampton
ENGINE
TYPE 84ci Shovelhead
BARRELS H-D bored
CAM Andrews J grind
LIFTERS JIMS solids
PUSHRODS S&S
VALVES/SPRINGS Fererra
OIL PUMP High volume
IGNITION Dynatek
CARBURETION S&S Super E/Holley
FUEL REGULATOR Malpassi rising rate
FUEL PUMP MSD electric
MANIFOLD Crampton Customs
AIR FILTER K&N
EXHAUST CC stainless
IGNITION Dynatek
MODIFICATIONS
Garrett T25/28 hybrid turbo, 3in SS
dump pipe, SS exhaust manifold,
Custom Intercooler and air duct,
Custom stainless inlet plenum,
Adjustable boost controller
TRANSMISSION
TYPE Ultima 5-speed
PRIMARY Ultima 2in
REAR DRIVE Chain
WHEELS & TYRES
F RIM 21in 60-spoke
R RIM 18in 60-spoke
F TYRE 120 Avon
R TYRE 180 Dunlop
F BRAKE H-D
R BRAKE Exile sprocket brake
FRAME
TYPE 1949 FL
RAKE +5 ̊
MODS Custom battery tray
SUSPENSION
FRONT 1996 Wide Glide
REAR Rigid
SEAT Pan (Crampton Customs)
SEAT UPHOLSTERY Dave, Witha-Trim
CONTROLS
BARS Drag 1in risers
SWITCHGEAR H-D
FWD CONTROLS Black Billet
SPEEDO Dakota Digital
GAUGES AutoMeter boost, air/fuel ratio
REV LIMITER Dynatek 2-stage
HEADLIGHT Bright
TAILLIGHT Maltese Cross (side mount)
GUARDS & FINISH
R GUARD Crampton Customs
FUEL TANK H-D
FUEL CAP Custom quick release
FUEL LINES Braided
OIL TANK Crampton Customs
PAINT Black
Right: This gorgeous cafe racer was
also built by Luke Crampton. It’s an
XT 500 Yamaha single – with a Toyota
supercharger. The tank was made
from a Tooheys beer keg and the
headlight surround was originally a
wok! And check that beautiful front
brake! Words fail us ...Yep, we'd be pretty
pleased too.