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Help needed with motor set-up

1315 Views 3 Replies 3 Participants Last post by  RichD

I am currently working on a project to covert a ARii Mazda RX-7 plastic kit to a slot car, but I've encountered a problem...

I have recently bought a HRS Slot-it Chassis to mount the kit on, but I need a sidewinder motor so I can fit in the plastic kit's interior (or a Fly one), anyhow can someone tell me what on earth is the different between Slot-it's 38/34/32/26 tooth sidewinder crowns?

Does the amount of teeth help with performance or smoother running? And what would be the best for a fairly large home Scalex Sport circuit?

Oh, it's all getting a bit confusing!


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The sidewinder gears are called Spur gears.. a crown gear is for inline use....

With the slot-it gears they are all the same dia. but for a short track you will want a higher gearing... say 10/38 or so.... that is a 10 tooth pinion with a 38 tooth spur gear...... That will give you good acceleration.... for longer track you want to gear lower.. like a 10/34 or so.......

The tooth count of the pinion and spur give you your gear ratio.. 10/38 is 3.8 : 1
good for short track..... You will find all the slot-it gears to be smooth running....

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