It depends on their quality, and as mac says, the KV, and the size (which helps determine torque).
If they are low quality, mass produced ones then the torque probably won't be enough to keep up with the demands of an 1/8 buggy/truggy.
Look at motors for Heli's as they need more torque - an Align 600XL isn't too bad.
The best motors are Neus, the Castle Motors (also Neus), Hacker motors and Lehners.
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