Motor Adapters

Fit: Auto manufacturers sometimes change the transmission profile and starter hole locations. To fit a variety of transmissions some adapter plates may have more or fewer bolt holes than your make and model of vehicle requires.

All adapters retain the use of the clutch and will fit the following brand motors if they have a B-Face and keyed 1-1/8″ Dia. shaft:

  • HPEVS motors (size AC35 and up)
  • WARP motors (by Netgain)
  • ADC motors

Mechanical information is provided with each adapter description in our on-line store for you to confirm fit details to your transmission.

Availability: Hub and Hardware are usually in stock and ready for next day shipping.

Why clutch-type adapters:

  • If a motor seizes, the clutch may be used to avoid drive-wheel lockup.
  • If the controller fails ON, the clutch may be used to prevent runaway.
  • Shifting without a clutch is often possible but the delay can create hazardous situations.
  • Performance gains from a no-flywheel vs a stock or lightweight flywheel are negligible. 
  • Clutchless adapters cost about the same as the clutched.

About Taper lock versus Set Screw hubs: Over the years there have been two common ways of holding the adapter hub to the motor shaft with great debates. The taper lock hub uses three or more bolts to pull the hub onto a tapered locking sleeve. This works if the bolts are torqued gradually and evenly if the sleeve does not move on the shaft while pulling the two parts together. However, if they are pulled untrue it creates flywheel wobble and vibration. There is also a chance that while pulling the two parts together the inner sleeve will move on the shaft moving the position of the flywheel and causing the clutch to not work properly. The taper lock hubs were used on S-10 and air-cooled VW adapters for a long time but due to occasional wobble problems, the set screw hubs are now used. These hubs slide onto the shaft against the motor front bearing. Thus reducing the chance of hub movement because the clutch force is transmitted directly to the bearing rather than through the set screw. Some of the setscrew hubs of other brands were installed on the motor shaft to the correct distance from the adapter face. Then a small hole drilled in the motor shaft and a set screw was used to keep it in the right place. Over time this could wear and the set screw could come loose from repeated use of the clutch.

Questions? Please send us your vehicle details such as Year, Make/Model, Size of Engine, Manual/Automatic, and accessories such as Power Steering, Air Conditioning, and the country you reside in.