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2013 600cc Micro Sprint
Rules
1. All
cars should be constructed to look like microsprints. All
cars must be equipped with complete body
panels (hood, tail, side panels, belly pan, etc.)
2. Roll cages must be of a 6 point design. Main cage must
be 1.25 tubing (.065 wall if using chrome moly,
.120 wall if using mild steel). All bends must be made of a
3 minimum radius (no square or pointed
corners allowed).
3. Kill Switch MANDATORY, must be within reach of driver.
Preferred location is on the right side of dash.
Should be visible to safety crews and clearly labeled.
4. Belly pan must extend from the front of the seat to the
nose of the car.
5. Must be equipped with fuel cell or tail tank. Fuel
bladder or sprint type fuel cell HIGHLY
RECOMMENDED. Must be fully protected and securely mounted.
Must be separate from the drivers
compartment. No pressurized fuel systems.
7. All steering and suspension parts that are bolted
together must use locking nuts, safety wire, or cotter
pins.
8. All cars must be equipped with nerf bars extending to at
least the inside edge of the front tire and middle
of the rear tire. May not extend beyond the outside of the
tread width of any tire. Minimum diameter Ύ O.
D., .065 wall mild steel. No sharp or pointed edges.
9. Bumpers Must be present front and rear. Must be
securely attached and suitable for towing. Width
may not extend past outside of main frame rail.
10. Must be chain drive. No centrifugal clutches or belt
drives. No shaft drive.
11. 5 point racing harness mandatory, minimum width of 2
½. May not be more than 5 years old.
12. With driver seated in car, the drivers helmet may not
be higher than the bottom of the upper roll bar.
13. Brakes must be of hydraulic type and sufficient
strength as to stop the wheels in the pits or stop the
car while in motion on the track. Must have brakes on the
rear axle. Front wheel brakes optional.
14. Car must be equipped with a fuel shutoff valve and kill
switch. Both must be functional, within reach of
the driver, and clearly marked.
15. Throttle must be foot operated. Return strap highly
recommended.
16. NO electronic traction control devices permitted.
17. Radiators/oil coolers should be mounted in a manner
that makes it highly unlikely that it will be
contacted by another car. May NOT be mounted in drivers
compartment.
18. No sail panels allowed on any part of car, including
sidebars. A panels may not protrude more than 2
inches behind rear down tubes.
19. Sides of chassis must have panels installed. Must have
sprint type tail tank. Must run sprint or modified
style hood.
20. Screen over windshield area highly recommended.
21. Suspension on all 4 wheels. May be of coil over,
torsion bar, or leaf spring design.
22. Steering mechanism must be constructed of a minimum of
5/8 rod and 3/8 heims. Steering wheel hub
must be of quick release or pin style.
23. All radius tubes should be a minimum of 9/16 diameter
with a wall thickness of .120.
24. Wheelbase - 50 minimum, 72 maximum.
25. Overall width - Shall remain between 58-65 sidewall
to sidewall.
26. All wheels must be race approved, 10 inch diameter
only. Steel, aluminum, or carbon fiber wheels are
acceptable. Beadlocks recommended.
27. One piece live rear axle only. No quickchange or
differential type rear ends. No accessories (hubs,
sprocket, etc.) may be welded to the axle. Nut or snap ring
must be present at end of axle to prevent
wheels from coming off.
28. A firewall must separate driver from engine
compartment.
29. All bolts should be grade 5 minimum and should use
locknuts, lock washers, or be safety wired or
cotter keyed.
30. Sprint car type window net RECOMMENDED on left side of
the cage.
31. Torque arm must be secured by a minimum Ό cable or
chain, or other reasonable safety device.
32. All cars must have a top wing at all times. Must be
securely fastened. If damaged during race, car may
continue provided it is still reasonable secure. NO CARS
WILL RUN WITHOUT TOP WING!
Top wing may not exceed 16 sq. ft., 48 long x 48 wide
maximum. Side panels must not obstruct the view of
the driver. 22 tall, 56 long right side board maximum (may
taper down at front). 28 tall x 56 long left side
board maximum. Wing sliders permitted.
33. Nose wings allowed. Maximum size 28 x 18. Must not
mount forward of front bumper.
34. Wet cell battery mounted in the cockpit must be covered
and vented.
35. All added weights must be painted white with car number
clearly marked on it. Weights must be
securely fastened with locknuts, or must be drilled and
secured with a cotter key.
Engine Rules: 600cc Micro Sprint Universal Engine Rules as
follows:
600cc Micro Sprint Universal Engine Rules
1. Terms and conditions
a)
Internal Stock parts must use stock original
manufacturer parts for the particular year and make
engine, these parts can not be modified except where
noted, if the rules do not state that you can do
it, you can not do it. No mixing of parts from different
year and make engines, even if made by the
same manufacturer. Non stock or modified stock external
bolt on parts may be used (example: billet
oil pan, starter, water pump cover, oil cooler, pipes,
valve covers, etc.)
2.
Overall Engine
a)
Must be a Production Motorcycle Engine, 4 cylinders, 4
stroke. No limited production race motors
allowed, only US street legal bike motors are allowed.
b) Current year engines allowed c) No Titanium anywhere
in or on the engine, unless it comes stock
form manufacturer of engine on the production bike
d) Must have engine, clutch, and transmission all in one
unit
e) Must be Chain Drive
f) Manual cam chain tensioners are allowed.
3. Bore
and stroke
a)
600cc Maximum for engine model that was new in 2006 and
up. Other engines are 637cc
maximum. Engine model is defined as a manufacturer
redesign of overall engine. See Specification
list.
b) Standard Stroke only (no strokers)
4. Head
and cams
a)
NO PORTING or Blending the bowls.
b) Valve jobs, valve grinding, valve seating, valve seal
modification and valve seat cutting are
allowed.
c) Valve seat inserts may be reworked or replaced with
any seat of original dimensions. Any
dimensional thickness of the stock inserts may not be
increased. Valve seats can be ground with
multiple angles. Blending of the valve seat into the
head is permitted but cannot extend more than
Ό into the aluminum head measured from where the seat
meets the head.
d) Cams do not need to be stock, but the lift must be no
greater than stock. (duration is open)
e) Cam timing may be adjustable
f) May use any valves (no titanium), but they may be no
larger than stock valves.
g) Head may be resurfaced
h) Any head gasket may be used
5.
Pistons
a)
Any piston, piston rings, and wrist pin, may be used,
must be within cc limit specified under bore
and stroke.
b) After market coatings are allowed on pistons only.
6.
Bottom End
a)
No machining to remove weight from the crank (no
after-market cranks) (no lightweight cranks)
b) The stock unmodified connecting rods must be used (no
after-market rods)
c) Aftermarket rod bolts may be used
d) Modifications to oil pump system, oil pick up and oil
passages are allowed
e) No dry sump systems are allowed unless it comes from
the motorcycle manufacturer as original
equipment.
7.
Clutch/Transmission
a)
The clutch does not need to remain stock, but must
remain operable
b) Transmission gears must be stock, no close-ratio
gears or nonstandard gear-ratios
c) All gears must remain in transmission, no removing
any gears. No lightweight or modified stock
gears.
8.
Ignition
a)
Stock Rev Limiter must remain intact at all times (ex:
no switched or gear specific limiters).
No hot ECU boxes, no physically modified ECU boxes.
Factory race boxes are ok, but must have the
rev limit set to the street bike stock rev limit. If a
computer is hooked up to check the ECU it must be
set to factory stock specifications, no tolerance. See
specifications list for RPM limits.
b) All cars must have the PA standard connector for the
track to check engine rpm rev limit.
These are available from the chassis manufactures and
engine builders, and at the track. All
cars must leave intact the rpm wire coming from the ECU.
c) Stock appearing ignition must be used (no
after-market ignition systems, factory race ignitions
are
ok) may use different year ignitions from same
manufacturer as long as stock rev limit of engine (not
ignition) is retained.
d) No aftermarket coils
e) Engines that came with stock fuel injection may use
an after-market add on components
(example: Power Commander, Dim Sport) to adjust the fuel
curve and/or timing (essentially the same
as adjusting jetting and using an ignition advancer).
f) Ignition advancers may be used
g) No gear position sensor may be used. The sensor may
be in place on the engine, but can not
have any wires connected to it. Gear position wire from
ECU may not be switchable.
h) No traction control device.
i) Only one ECU box present in or on car.
j) A 350 rpm over rev tolerance for the purpose of tech
inspection is acceptable. (Note: this does not
mean you can turn up the rpms in any ECU by any amount,
this is information for the tech inspector
only)
9.
Induction system
a)
No mechanically forced induction (turbo charging,
supercharging)
b) Any carburetors may be used on any engine, regardless
of year of engine.
c) If the engine did not come from the factory with fuel
injection, fuel injection may not be used.
d) If the engine came with factory fuel injection, the
fuel injection may be used and may be converted
for use with alcohol. The stock fuel injection throttle
bodies must remain, but may be modified for use
with alcohol. Any number of injectors may be used
regardless of stock number of injectors.
10.
Exhaust
a)
Any exhaust may be used, as long as there is a muffler
included with the system that will keep
noise levels within individual track limits.
11.
Charging system
a)
The stock original factory charging system may not be
removed, and must remain in complete
working order. No factory racing charging systems.
b) Flywheels can be modified.
12. Self
Starting
a)
The engine must self-start at the beginning of the
event. If it does not self-start, the car may be
pushed off and must start at the rear of the event as
the penalty.
13. Fuel
a)
Only alcohol, gasoline, and/or top lube may be used. Non
flammable top lube only, no exotic fuel
additives, no oxidizers, no fuel enhancer top lube.
b) Fuel tanks must contain a bladder. A fuel tank with a
bladder is further defined as a plastic outer
shell with a rubber inner container.
14.
Minimum weight
a)
Minimum weight at all times is 775 pounds, car and
driver. If weight is added it must be firmly
bolted in place.
U6SA Page 2 of 2 Issue Date: 10/10/2009
CLARIFICATIONS
These decisions are made by the U6SA clarification
committee, Glen Lewis (head), Kenny Miller, Randy
Brookens, and Rick Stief. You can email claification
requests to Glen Lewis Lewis.glenn@verizon.net
1.
Valve spring spacers are allowed to be used. Generally
these are added to increase valve seat
pressure.
2. Valve guides cannot be replaced with after market
valve guides. Although the stock ones can be
modified, you must start with a stock guide.
3. Valve guides may have a 7 angle grind or any grind on
them, the stock dimension rule on valve
seats applies to the thickness of the seat, not the
grind.
4. Mechanical injection is legal on an engine that came
with electronic fuel injection. All other rules
still apply to that system, ie: "Stock appearing
ignition must be used" , and "The stock fuel injection
throttle bodies must remain".
Engine Model Year Rev Limit Tach Wire Color
Kawasaki ZX-6R,
ZX-6RR 03-04 14,400 Light/Blue
Kawasaki ZX-6R
ZX-6RR 05-06 14,800 Light/Blue
**Kawasaki ZX-6R 07 15,000 Light/Blue
Yamaha R6 03-05 15,500 Yellow/Black
Yamaha R6S 06-07 15,500 Yellow/Black same engine as 03-05 R6
**Yamaha R6 06-07 16,000 Yellow/Black
Suzuki GSXR 04-05 14,600 Yellow/Blue
**Suzuki GSXR 06-07 15,000 Yellow/Blue
Honda CBR F1-F3 90-98 13,200 Yellow/Green
Honda CBR F4 99-04 13,900 Yellow/Green
Honda CBR RR 05-06 15,000 Yellow/Green
**Honda CBR RR 07 15,500 Yellow/Green
**= Must be 600cc
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