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Rules and Regulations


*Download the 2017 Rules and Regulations HERE* 





2017 Rules and Regulations




General Information:


This booklet contains the official rules and car specifications for all sanctioned events of the Affordable Controlled Micro Sprints. Any point not covered herein shall be resolved by the ACMS Series or their appointed committee.


***Complaining/arguing to any track official will NOT be tolerated and get you parked for 2 weeks.***


It is the intent of ACMS Series to NOT revise the rule book during the season. However, we reserve the right to make changes when necessary for safety, cost or technical reasons.



Age Limit:

·         In general, the minimum age of a member driver will be 14 years of age. However, an underage driver that has at least 4 years of racing experience in a competitive form of racing may be given an opportunity to drive in hot laps to allow the rules committee to evaluate his/her ability to handle a car.




·         Micro Sprint car racing is a very emotional sport. As such, good sportsmanship is the key element of any competitive racing program. This must include respect for all participants - drivers, owners, pit crews and officials. For our part we will make every effort to be consistent with our rules regardless of whom or what is involved. We will treat all participants with respect and expect similar treatment in return. A racer’s pit area is his castle - therefore, please stay out of other racer’s pit area. Drivers - remember that you are responsible for the actions of your crews. Any offending parties will be fined appropriately and disciplinary actions will be initiated as deemednecessary.





·         Please bring your RACEceiver to every race. We reserve the right to penalize drivers that do not run theirRACEceiver.

·         No two way radio communications with drivers will beallowed.

·         Tachometer:

·         An AceWell AC-1100 Digital Tachometer with recall is mandatory. The tachometer must be mounted under the hood of the car so it can not be reached by thedriver

o   >>>We will work on getting these to work on allcars!

·         If the Tachometer is not turned on or it is zeroed out the car will bedisqualified.




·         Engine 600cc 4 cylinder 4 stroke as comes on a stock production bike for public sale in the U.S.A. No current year productionengines.

·         Except as noted, all internal and external engine parts must remain stock with no modifications, metal removal, blueprintingetc.

·         Valve seat inserts may be reworked. Valve springs may be shimmed with standard or aftermarketshims.

·         Cylinder head combustion chambers may be cleaned by bead blasting with valves seated in place.

·         A total combined .010 may be removed from head and block deck in the event of warpage/damage.

·         Cylinder head gaskets may be replaced only with original equipment manufacturers stock parts (All 3 layers of the head gasket must be used). All other gaskets may be replaced with duplicate aftermarket parts. Light cleaning of gasket surfaces with steel wool, Scotch-Brite, etc. isallowed.

·         Aftermarket cam chain tensioner allowed for safety ofmotor.

   ***Altering stock cam timing isPROHIBITED***

·         No coatings of any sort are allowed on engine or transmissioncomponents!

·         Factory stock ECU with factory stock rev limit matching year and manufacturer of engine is required. No more than one (1) ECU pervehicle.

·         Mixing of manufacturer parts is prohibited (i.e. Yamazuki,etc.).

·         Modification of oil pan & pick up allow allowed or aftermarketok.

·         Modification to thermostat cover or aftermarketallowed.

·         Modification to water pump cover or aftermarketallowed.

·         No flammable liquids allowed in coolingsystems.

·         Traction control devices areprohibited.


All engines will be subject to tear down at any time. During tech, engines will be thoroughly checked for compliance. A static compression test may be performed. Factory settings (with a tolerance) will be checked. Teams must be prepared to remove their oil pan plug and oil at any time for tech purposes.




·         Transmission gears may be shimmed only for the purpose of properengagement.



·         Standard or aftermarket shims may beutilized.



Fuel Injection:




·         The fuel injection system must be from the same manufacturer and model as the engine and must be modified for Methanol. No boring or modifications of the throttle bodies except for TPS reliabilityissues.


·         A Power Commander or Gutz Box may be used but ALL other mapping devices areprohibited.

·         Fuel injection engines may run carburetors. No timing modules allowed. Fuel injection engines running carburetors may change all fuel metering devices to tune fuel curve. Billet intake boots allowed.




·         Any 600cc OEM CV carburetors - NO FLATSIDES.

·         Modification to the carburetor for methanol must bemade.



Air Box:

·         Any air box, stock appearing CDI, aftermarket washable replacement airfilter.

·         Power Commander on fuel injection modelsonly.

·         No superchargers, turbo chargers ornitrous.







·         Any header can be used. A muffler must be used with the exhaust system that will keep noise levels within individual tracklimits.



Charging System:




·         The original factory charging system may not be removed and must remain in complete working order.


You may NOT cut the flywheel down AT ALL. It must remain in its stock form!





·         Only pure methanol may be used. No fuel additives except top end lube are allowed. An AN fitting welded on steel fuel rail (no hose clamps) ismandatory.



Fuel Cell:




·         A tail tank with bladder or a fuel safe cell is mandatory and must be securelymounted.







·         All cars must be self-starting 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 thepenalty.






·         Tire compound on the right rear must be a Hoosier ASCS2 or a American Racer Spec Tire. Durometer must be 48 or higher immediately after therace.

·         Tire compound on the left rear must be a minimum of a Hoosier RD15 compound or American Racer SD38. Durometer must be 35 or higher immediately after therace.

·         No tire warmers are permitted at any time. No chemicals can be applied to tires at any time. The only tire modifications allowed are siping, grooving, and grinding. Tire Bleeders are notallowed.

·         Bead locks recommended on allwheels.



Chassis Adjusters:




·         A top wing adjuster, manual or electric, may be used. Only 1 adjustment other than the wing slider is allowed. If you choose to not run a wing adjuster you are only permitted to have 1 Adjustment.

·         No anti roll bars areallowed.



Chassis Specs:




·         Wheelbase must be between 58” to67”.

·         Weight Limit is 775 pounds when using wings or 750 poundswingless.

·         Sprint Car appearance isrequired.

·         Frame must be fabricated from 4130 Chromoly tubing and TIG welded. Minimum roll cage tubing of 1-1/4” x .065” must beused.

·         No titanium bolts or components on thechassis.



Top Wing:

·         Center air foil cannot 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 centerfoil.

·         Top Wing must not extend beyond outside of rear tires or behind the rearbumper.

·         Center foil must be square or rectangular in shape with all 4 corners set to 90 degreeangles.

·         Center foil must be one piece. No split or bi-wingspermitted.

·         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 barbracing).



Nose Wing:

·         A nose wing isoptional.

·         Center air foil cannot 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 centerfoil.

·         Nose wing must not extend beyond the outside of the front tires or beyond the frontbumper.

·         Center foil must be one piece. No split or bi-wings permitted. The maximum dimension 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 barbracing).




·         Cars must have front and rear bumpers that extend beyond the front and rear tires. These bumpers must be made of steel or stainless and not of bent conduit. A hooped rear bumper is recommended.



Nerf Bars:

·         All cars must be equipped with nerf bars. Nerf bars cannot extend past the outside of thetires.


Seat Belts:

·         Seat belts must be worn at all times. They are to be securely fastened to the car and must be of the 5 point design. Seat belts must be in good condition with no tears or fraying. ***No more than 3 yearsold.***



Arm Restraints:



***Arm restraints are recommended***




Gloves and Driver Suits:

·         Gloves must be fire retardant and overlap the sleeves of the driversuit.

·         The Driver Suit must be a brand name two layer or greater or have fire retardant undergarments and allow for no exposed skin below theneck.



Neck Brace:

·         A neck brace or Hans Device or equivalent must be worn at alltimes.




·         Helmets are to be full coverage competition type fire retardant and SA2010 or newer. Helmet may not have any outer damage. A face shield must beworn.



Safety Inspections:

·         Safety inspections will be conducted at the beginning of the season and randomly during the season. Each car will undergo a safety inspection and receive a ACMS Series safety decal. Safety issues throughout the year will be corrected before allowing the car tocompete.



             ·         A full containment seat isrecommended



Race Procedures:

·         All cars will pull a pill to create the heat race lineup. The heat race will be 8laps.

·         The feature lineup will be determined by the winner of the first heat race drawing a pill for starting positions. Feature races will be 20 laps. Vacancies caused by a car not being able tostart will not be filled. Cars will slide forward to replace cars missing from line ups. (we will not be crossingover)

·         If a driver changes cars after the heat race that driver must start from therear.

·         You are only permitted to race your ACMS car in 1 class per night! If you run with the US6A class you will not be permitted to race with the ACMS Series on thatnight.

o   If you want to race both classes in one night you will need to bring 2 cars and run 1 in eachclass.



Post-Race Procedure:

·         All cars must report for weigh-in after therace.

·         The TOP 3 cars to go through tech IMMEDIATELY afterscales.

o   Tech will take place either at the Tech shed or the #1J trailer every night! We will let you know on the night of the race where to go fortech!

o   If you do not hear where tech is taking place it is YOUR responsibility to check with AJ Bast or Christopher Stringfellow before the Feature for techlocation.

·         If you go to your trailer you will be disqualified. Tires will be checked when crossing the scale for proper left rear and right rearcompounds.



The following items will be teched:

·         TireDurometer

·         Engineseal

·         The hood must be removed to check for any cockpit adjustable electronic devices and to check the rev limit on thetachometer.

·         Cars to be teched must remain in the tech shed until tech is complete. If a car leaves early or does not appear for tech they will bedisqualified.



Engine Tech:

·       Engines will be teched against a completely stock engine of the same Make/Model/Year and then put together andsealed.

·         Any engine MUST go through our tech procedures with 1 of our 3 approved builders for tech. NO EXCEPTIONS! If you show up to the track without a seal you will not race with the ACMS Series!

o   If you your engine builder is an approved Techer, He is not permitted under any circumstance to seal his own engine. For example – If builder A builds your engine, Builder B or C MUST be the ones to tech theengine.

·         Engines must be presented at Tech with the head off of the engine. You must supply all of your own gaskets for engine tech and they must be with you at the time oftech.


·         Tech for Yamaha, Kawasaki, and Honda will cost$75


·         TechforaSuzukiwillbeasfollows,FirsttimeaSuzukiissentthroughthetechprocessitwill be $100 due to the extensive work that has to be put in to check cam timing. The cams and gears will be marked at tech and if that engine is presented to tech at any later date with those cams it will only be $75 for a techfee.

·         If your cam timing is found to be Illegal, Techers will not be responsible for adjusting your cam timing. You will be given your engine back and asked to return at a later date with the timing of the cams in compliance or you will not receive aseal.


·         All seals are serialized and will be kept on file for each engine and team. Committee members will be presented with a master copy of all engines in the series and hold the right to check seals at anytime.

·         Engine builders will then submit your engine specs to keep on record. If you are tore down later in the year and something doesn’t match your done for theyear!***









Rule Violations and Disqualifications:


We have Major and Minor violations that will be addressed in this section. If you are disqualified at any time you will not receive pay or points for that night whether it is a Minor or Major violation.


·         Minor Violations will disqualify you for the night but you will be permitted to return and race with the ACMS Series the next week. These include thefollowing.

o   Violating the weightrule.

o   Not appearing at the scales directly after leaving thetrack

o   Going to your trailer before tech and/or thescales.

o   Not having the required pins in your rearaxle.

·         Major violations will carry a “3 strike” rule.  Each violation will be handled asfollows

o   First violation will result in a 1 race suspension from the ACMSSeries

o   Second violation will result in a 3 race suspension from the ACMSSeries

o   Third violation will result in suspension from the ACMS Series for the remainder of the year from the ACMSSeries.

§  Major violationsinclude:

v  Failing TireDurometer

v  To many cockpitadjustable

v  Refusing techinspection

v  Having any mapping device other than a Power commander or GutzBox

v  Intermixing any parts including but not limited to, Brand, model,year.

v  Appearing in tech with your high RPM number on your tach over stock rev limit.

v  Appearing in tech with your tachzeroed.




·         All protests shall be made prior to payout. All protests shall be made in writing naming the specific item being protested and be given to the ACMS Series representative. Only registered drivers or car owners may file a protest. Protest cost for any external item or involving the removal of the oil panis

o   $100.00. Protest cost for any internal item involving tearing the engine apartis

o   $500.00. All decisions will be made fairly and in accordance with the rules. (ALL DECISIONS AREFINAL!) 

·         Money posted for the protest will be distributed as follows: If the protest is founded 75% will be returned to the filer and 25% to the ACMS Series. If the protest is unfounded 75% will be given to the protested car and 25% to the ACMS Series.



Payout per night:


·         The payout for the event will be based on finishing position from the feature and the car count. Payout will be distributed by thetrack.





Points will be awarded for both the Heat Race and the Feature. Only cars who take the green for the Heat Race will be awarded points for the Heat Race. Only cars who take the green for the Feature will be awarded points for the Feature.



Heat Race:       Feature:  
1st 10   1st 30   13th 12
2nd 9   2nd 28   14th 11
3rd 8   3rd 26   15th 10
4th 7   4th 24   16th 9
5th 6   5th 22   17th 8
6th 5   6th 20   18th 7
7th 4   7th 18   19th 6
8th 3   8th 17   20th 5
9th 2   9th 16   21st 4
10th 1   10th 15   22nd 3
      11th 14   23rd 2
      12th 13   24th 1