KTM 250SX QUAD FLOW TORQUE WING
MXA TEAM TESTED
WHAT IS IT? The Quad Flow Torque Wing is an
intake-tract winglet for the KTM 250SX two-stroke that
changes turbulent airflow into laminar airflow to improve
;;;;;; IT COST? $150.00 (installed).
CONTACT? www.dicksracing.com or (916) 722-2373.
WHAT STANDS OUT? ;;;;;; a list of things that stand
out with the ;;;;;; Racing Quad Flow Torque Wing.
(1) History. ;;;;;; Quad Flow Torque Wing is not the
first winglet to be installed in the intake tract to improve
air velocity. You might have heard of Swirl-Up, Power Now,
FMF Snap, Tornado, Intake Twister or the Boyesen X-Wing.
All of these ideas focus on realigning the airflow through
the carb throat.
( 2) Concept. Motorcycle engines are air pumps. Air is
drawn in, compressed by force, expanded by the combustion
and expelled by the exhaust. Contrary to popular belief, fuel
does not explode in the combustion chamber. Instead, the
engine processes air, mixes it with fuel and burns the fuel
mixture in a controlled manner to expand the air, which in
turn pushes the piston downward to draw more air in. Once
you accept that an internal combustion engine is an air pump,
you can begin to understand how important the transition of
air through the system is.
( 3) Winglet theory. Intake-tract winglets work like an
airplane wing. They take tumbled air and straighten it out.
Their goal is to achieve laminar flow. Laminar flow is the
smooth, uninterrupted flow of air over the contour of the
wing. The Quad Flow Torque Wing is designed to reduce
drag at the ;;;;; boundary layer, reduce surface-friction drag,
equalize the pressure gradient and increase air velocity.
( 4) Differences. Virtually every intake winglet is
different. Some, like the FMF Snap, mount in the air ;;;;;;;
velocity stack. Some, like Power Now, mount in the bell of
the carb, and some, like the Boyesen X-Wing, extend deep
into the ;;;;;; venturi. The ;;;;;; Racing Quad Flow Torque
Wing is unique in that it mounts on the cylinder side of the
;;;;;; venturi instead of the
airbox side. Why? Because it does not want to split the
airflow at the fuel nozzle or disrupt the atomizing process
at the source. Instead, the ;;;;;; Racing Quad Flow straight -
ens out the air as it exits the carb. Additionally, it protrudes
into the reed-valve area to keep velocity high and eliminate
back-pressure turbulence from the flapping reed valves.
( 5) Performance. Every test rider felt increased
throttle response at low rpm, a smoother transition
from the low end to the midrange, and a more flexible pow -
erband across the range. Power take-up felt crisper, and,
best of all, the dips in the power curve were ironed out. The
benefit of increasing air velocity is that more
air carries more fuel, which results in more effective
combustion. It is a win-win.
( 6) Installation. You have to send your carburetor to
;;;;;; Racing to have some minor machining done to fit the
winglet into the front side of the carb throat.
;;;;;; THE SQUAWK? You have to send your
carburetor to ;;;;;; Racing to have some minor
machining done to fit the winglet into the front side of the
This simple little device works.
The Quad Flow Torque Wing was conceived, built, tested and patented by Lonn Peterson at Thunder Products, Inc.
We have worked with Dick Wilk at ;;;;;; Racing for many years. He is our California dealer and a great tuner. Dick
brought our product to MotoCross Action Magazine for testing.
We have Quad Flow Torque Wings for most makes and models of off road motorcycles and snowmobiles. Note: you
must know the maker of your carburetor and size (usually in mm). Once your carburetor is removed, its an easy ten min -
ute installation with normal hand tools (no machining required). Re-jetting is not usually necessary. The Quad Flow Torque
Wing gives the same results on any engine regardless of make or model for $99.00 per carburetor.
Thunder Products, Inc. Manufacturer of INTELAJET & Dial-A-Jet www.thunderproducts.com 320-597-2700