2010
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
¼” 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. U6SA Page 1 of 2 Issue Date: 10/10/2009
8. Ignition a) Stock Rev Limiter must remain intact at
all times (ex: no switched or gear specific limiters).
No hot ECU boxes, no pysically 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.
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. If you do not have a bladder installed
you must have a 3 point wrap around bumper.
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.
600cc U6SA Suggested Wing
Rule
1. Top Wing a) Center air foil can not exceed 12 sq. ft.
(1728 sq. in.) of surface area. Surface area is defined
by the length x width of the flat plane of the largest
projection of the center foil. b) Top Wing must not extend
beyond outside of rear tires or behind the rear bumper.
c) Center foil must be square or rectangular in shape
with all 4 corners set to 90 degree angles. d) Center
foil must be one piece. No split or bi-wings permitted.
e) Maximum dimension of each side panel is 54-1/4”
x 24-1/4”. Only two side panels allowed. No kick-out
allowed. Panels must be parallel. Maximum of 2”
deep side panel, this is the protrusion of the stiffening
members not including the struts (tubular or flat bar
bracing).
2. Nose Wing a) A nose wing is optional. b) Center air
foil can not exceed 4 sq. ft. (576 sq. in.) of surface
area. Surface area is defined by the length x width of
the flat plane of the largest projection of the center
foil. c) Nose wing must not extend beyond the outside
of the front tires., or beyond the front bumper. f) Center
foil must be one piece. No split or bi-wings permitted.
d) Maximum dimensions of each side panel is 10-1/4”
x 24-1/4”. Only two side panels allowed.
Panels must be parallel. No kick-out allowed. Maximum
of 2” deep side panel, this is the protrusion of
the stiffening members not including the struts (tubular
or flat bar bracing).
NOTE: ANYTHING NOT COVERED IN THESE SPECIFICATIONS
WILL BE THE DISCRETION OF THE TRACK PERSONNEL WITHOUT
RECOURSE FROM ANY DRIVER OR OWNER ALL SPECIFICATIONS ARE
SUBJECT TO REVISION.
For more information call Roger Gettel at (717) 532-8581
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