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R4 Modified Motor Details

R4 Modified Motor Details

Mark Fulton |

Nine months of work with three redesigns finally allows release of the new Team Power Products R4 PRO Series ROAR Modified motors. Currently available in 13.5TEX and 10.5 MWM through 3.5 winds, this new family of motors produces more torque at lower temperatures than the previous R3.0 and R3.1 designs. Considerable engineering costs devoted to its development makes the R4 a premium line of 540 sized brushless/sensored motors for those who compete at the highest levels of the sport.

All motors (stock spec and modified) use two ball bearings: 9.525mm OD, 3.967mm width, 3.175mm ID.

In the modified list are two special variants:
13.5TEX: I built a special non-ROAR spec motor for an individual two years ago for a special race. And since that time I have had many requests for this very special, high torque 13.5. This is achieved with the insertion and setup of a modified rotor just for this purpose. THIS WILL NEVER BE A ROAR SPEC APPOVED MOTOR, but for those races or tracks which are non-specific about this motor, this is the one to have. You can confirm this model by looking at rotor part number on shaft. The part number begins with 'C5'. This motor is found in the 'R4 PRO Modified Series' section.
10.5MWM: Originally built for a one off race but it has turned into a popular wind. This motor is legal as a ROAR modified motor and has a special stator as well as rotor. Very competitive with 8.5 turn motors on some tracks! Motor is marked as 'Modified' on the can and will have a rotor part number beginning with 'C5'. 'R4 PRO Modified Series' section.
There were two areas of improvement I wanted to achieve with the evolving motor line from Team Power Products:
1. Increase rigidity of motor can: the R3.0 and R3.1 motors were three piece designs, the best I thought I could do at the time. The new R4 PRO Series motors are a two piece construction, allowing better control of the rotor during high rpm and heavy acceleration. With the upset forged can design, the forward (shaft side) of the motor is one piece, no fasteners needed to hold a cap or endbell in place. The timing end is integrated into the motor structure with three 7075 aluminum screws to make the whole motor more stable when under power.
2. Increased air flow in can: heat is the enemy of any electric motor, but with the two piece can, there is more open area available to generate 'heat movement channels' with CNC milling in strategic areas. More metal could have been removed, but he holes in the can help move the air (and heat) out of the can efficiently than simply relying on conduction cooling.
This motor has been winning races since its introduction in 2019. This motor has the high power and torque needed to win races but the smoothness to deliver fine throttle control for an easy drive and win!
Standard Features:
•CNC Machined Billet T6 Aluminum One Piece Can and Upgraded Timing Assembly Endbell
•Two Color Anodized Can
•High Purity Copper Windings Maximizes Torque
•High Power Solder Tabs
•High RPM precision ABEC5 Ball Bearing from NMB Japan
•Removable/Replaceable Rotor
•Powerful Sintered Neodymium Magnet
•Precision Engineered for Maximum Power Output
•Adjustable Timing
•Compatible with any Sensored/ Sensorless ESC
•Dual sensor port
•Aluminum Motor Stator Screws for Maximum Magnetic Field
•Silicon steel sheet for Stator Laminations made by Japan Kawasaki
•Top quality UH magnets for Rotor
•Aluminum Can Shell Manufactured with CNC machines

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