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Discussion Starter · #1 ·
I recently bought 75 used motors on ebay they are all scalextric stock motors and they all work when tested with a 9V battery.
Question is there an easy way to find the strongest motors with a volt/ ohm/ amp meter so as not to have to hook each motor up to a car to test it
 

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If you have a power supply with volt and amp meters, you will get a grude idea by listening to the note/pitch of the motors, and the current draw compared to a reference motor whose performance you know.

Better, is to buy a non-contact tachometer off EBay. There is a Chinese seller and they only cost about 10 quid delivered.
Like this, but shop around, prices seem to vary. I paid less than this.
Dead easy to use, and quick.

http://www.ebay.com/itm/Digital-Laser-Phot...=item3cc32e1cbe
 

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Rich Dumas
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Since these are used motors I would flush them with contact cleaner while running them at six volts before I did anything else. Running the motors in a car is the ultimate test of course, but using a non-contact tachometer will at least screen out the dud motors. A really great Scalextric motor can rev as high as 23,000 RPM at 12 volts, but ones that good are very rare. For motors to race look for 21,000 RPM at least. The motors will also vary in torque, few people bother to measure that because it is more trouble than an RPM measurment and is usually proportional to the RPMs.
 
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