A) S16D "Econo" Motors
Purpose:
"Econo" Spec motors are an attempt to offer the Racer the opportunity to build a
very-low-cost, restricted-specification motor for use within
existing SDRA and other drag racing Classes. By purposely limiting the cost and
the degree of “blueprinting” and preparation that a given setup may
entail, Racers may concentrate on chassis prep and driving skills.
Motor Specifications:
shall be Sealed Parma # 00502 S16D motor (“502 Motor”).
Springs, spring cups, and brushes may be altered or replaced, and shaft
ends may be shortened. Motors shall be screwed-in only. Pinion is
unrestricted. Other than these modifications, no alteration or
modification of any type is permitted. Organizers reserve the right
to prohibit the competition of any motor A) deemed outside the
performance scope intended by these Rules, or B) which, in their opinion
only, shows any signs of alteration, tampering, abuse, or suspect
condition. Please see Econo Hardbody Pro Stock Rules for more
information.
Classes: These
motors may be specified for use in existing SDRA Classes, or new Classes
may be developed or combined that specify this motor.
B) Mura Spec Motors
Purpose: Mura
Spec motors are an attempt to offer the Racer the opportunity to build a
reasonably-economical, restricted-specification motor for use within
existing SDRA drag racing Classes. By purposely limiting the cost and
the degree of “blueprinting” and preparation that a given setup may
entail, Racers may concentrate on chassis prep and driving skills.
Specifications:
1. Armature: A pro Slot Super 16C
armature (PN XXX-X), shall be utilized. The
armature tag shall not be removed. Minimum diameter shall be no less
than .XXX". Armature may be rebalanced
and the commutator may be retrued. Timing is unrestricted
2. Basic Setup: Shall utilize
current production Mura can (PN M-3100),
endbell (PN XXX), and endbell hardware (PN
XXX), including
spring cups. Motors may be built using a complete Mura setup (PN XXX)
or individual Mura components. Older painted cans of identical
configuration are permitted. Hardware may be altered for brush alignment and brush
hood-to- spring clearance only. Any screws may be used to retain
hardware. Shunt wires, springs, and brushes are free
3. Can: Bushing
may be substituted and epoxied or soldered in place. Plating may be
removed from can interior and spot welds may be ground flush for
proper magnet fit and retention. Can seams may be externally soldered
(only). Can-to-endbell screw holes may be enlarged for screw clearance.
Identification markings may be engraved on the can.
4. Endbell: Bushing may be substituted and super-glued, epoxied, or
Loctited in place. Bushing hole may be enlarged for alternate bushing
clearance.
5. Magnets: Magnets shall be current Mura single-segment
production items (PN XXX), and their
configuration shall not be altered or modified in any way. Magnets shall not be honed in place and shall not utilize shims or any other spacing method, including epoxy, to
reduce the installed airgap. Magnet clips shall be retained, but Super
Glue or Loctite-type sealer only may be used for additional magnet retention.
Minimum air gap, measured center-to-center with the magnets installed in
the can, shall be no less than .XXX".
6. Installation: Any pinion may
be used. Motors may be
screwed in or soldered in the chassis.
7. No other modifications and/or
alterations to the setup/motor are permitted unless specifically
incorporated into an approved and printed revision of these Rules.
8. Right Of Inspection and Final Decision: FasTrax reserves the right to
inspect any Mura Spec motor entered in a heads-up Spec Class competition
at any time, including before, during, and after said competition. This
inspection may involve the removal of the motor from a car and its
disassembly. Further, FasTrax reserves the right to reject motor components or authorized modifications that do not meet
both the letter and the spirit of these Rules.
Note: Competitors are urged
to remember that the goal of these Rules is to promote a lower,
rather than a higher, level of motor preparation and
cost, and to act accordingly.
