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www.humberstonespeedway.com » DIRTcar Sportsman & 358 Rules

DIRTcar Sportsman & 358 Rules

Sportsman & 358 Modified Rules

Please Refer to DIRTcar Issued Rule Book.

Click Here for DIRTcar Rule Book

Sportsman 2012 Rule Amendments for Humberstone Speedway

SIDE BARS/NERF BARS Side bars/nerf bars and/or bracing must be made from a minimum 1-1/2” diameter round, 095”-inch thick magnetic steel tubing only unless otherwise specified. All edges and/or corners on bumpers and side bars/nerf bars must be rounded. Sharp edges will not be permitted. The rear bumper and/or any side bars must not extend past the outside of the tire sidewalls on either the left and/or right side of the car. No double side style bars allowed. Single (horizontal) side rails only.

FRONT BUMPER Only the front bumpers may be made from a minimum 1-1/4” diameter round, 095”-inch thick magnetic steel tubing. The front bumper must consist of two (2) horizontal rails; an upper and a lower and a minimum of two (2) vertical braces, equally spaced, welded between the two (2) horizontal rails. The horizontal rails must be positively fastened to the frame with four (4) sockets and/or supports. The front bumper must remain exposed without covering and/or any sheet metal fabrication surrounding it. The four (4) tubes that support the bumper from the four (4) frame sockets must be horizontal. These rails must be a minimum of 6”-inches and a maximum of 12”-inches apart when measured from the top to the bottom and maintain that measurement for a minimum width of 24”-inches and a maximum width of 30”- inches. The maximum the front bumper may extend from the centerline of the front axle is 24”-inches and a minimum of 20”-inches. The front surface of the bumper must remain flat, parallel and perpendicular with the front of the nose piece for the full width of the bumper. V-shaped and/or any other type of shaped bumpers will not be permitted. The end bracing tube of the front bumper must be fabricated on an angle in such a way as to prevent the bumper of another car becoming interlocked. Please refer to the drawing at the back of this rule book.

REAR BUMPER Rear and side bumpers, side bars/nerf bars and/or bracing must be made from a minimum 1-1/2” diameter round, 095”-inch thick magnetic steel tubing only unless otherwise specified. The rear bumper must consist of two (2) rails, an upper and lower, which must have four (4) sockets and horizontal support bars positively attaching it to the frame. The upper and lower rails must also be a minimum of 10”-inches apart and a maximum of 16”-inches apart from the top to the bottom and maintain that measurement for a minimum width of the 64”-inches and a maximum of 86”-inches. The maximum the rear bumper may extend back when measured from the centerline of the rear axle is 52”- inches. The rear surface of the bumper must remain flat and parallel with the back of the rear quarter panel for the full width of the bumper. V-shaped and/or any other type of shaped bumpers will not be permitted.

FUEL Fuel: VP D98 or Pump Fuel Only – NO additives, NO Aviation Fuel.

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