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Cox Engine of The Month
July-2024
robot797's

"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"



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Post  Jason_WI Fri Jun 23, 2017 6:07 pm

After looking to purchase one on eBay for a very long time I finally found a gear that will work to make a ratchet starter gear used on the GTP Nissan and others. This part isn't even listed on the parts breakdown in the manual. Unobtanium.

I found a Modulus 1 12 tooth pinion that is close. The teeth are not as tall but it meshes with the zip ratchet.

The gear is hardened and a file would not touch it. I heated it a dull red with a torch to anneal it so I could turn it on the lathe.

After turning it down and boring the hole it works perfect.

Cox GTP Nissan ratchet starter gear 815452F9-9C89-429F-9E6A-FFBF86E95052_zpscjayw5xw

The picture is rotated. The gear on the bottom is the one I made. The one that came with the GTP is on top.
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Post  Marleysky Sat Jun 24, 2017 10:53 am

Jason, that's some very nice work. Were you just looking through a "gears and Pully's" catalog to see if you could find something close to the unobtanium gear, or just playin "MacGyver" to get the starter working?
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Post  Jason_WI Sat Jun 24, 2017 11:52 pm

Basically eBay and google. I know mod .8 is 32 pitch and what my RC10GT uses for gears. This is smaller than the Cox ratchet gear pitch. Started looking for larger size gears and mod 1 seemed close. Found a 12 tooth with a long boss so the set screw would be machined off. After turning to size I filed the flat spots that drives the ratchet drum.

I had all the parts to make a spare GTP engine but the ratchet gear.
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