Mechanical brake / Castle Neu problem

[Ryu James]

so is that i micro server for your brake, Star? i cant tell in the pic. and is the carbon mounted to the center diff or the chassis?

[starscream]

Originally Posted by Ryu James

so is that i micro server for your brake, Star? i cant tell in the pic. and is the carbon mounted to the center diff or the chassis?

It's a hitec digital mini. I cheated and used some alum to mount the CF to the motor mount. I have a CF top plate on my mugen but the holes don't line up quite right so I got to get another piece of CF and replace the whole RC8T top plate like you mentioned.

Once again, awesome shipping from Mike. Ordered on the 16th (was the 17th here), and the spacer arrived this morning! :D Thanks Mike!

So, now the bad news lol, the spacer doesn't "space" enough lol. Lametastic! :(

I am attempting to use a 15T pinion, but it's about 1-1.5mm too far out to mesh properly, with the spacer on. The 17T is almost there, but not quite, and the 18T is almost perfect.

The spacer has improved but not fixed the issue. Without the spacer, the brake pads/screw were hitting the raised fins on the motor, so the pinion was even further away, so far that even the 18T pinion wouldn't mesh.

With the spacer, I can at least get the 18T to mesh (its probably a tiny bit too far out but I can live with that).

Anyway, the issue is that the 2200kv motor is like crazy over geared with the 17T pinion, so I can't imagine how crazy the 18T would be. The 15T is MUCH nicer, more controlable, and the amp draw and battery life is excellent, unfortunately, I can't get it to fit with the mech brakes.

So, is there anything I can do to make it fit. I assume I'd have to make a thinner spacer to add to the RCM one, like out of 3mm Aluminum or something like that, or perhaps cut some material away from the end of the can?

Here's a photo

[Ryu James]

yeah, that sucks bro. frustrating huh. you can cut into the endbell but i wouldnt. i did this and once you start it never stops and your motor looks like crap. plus you usually have to cut away way more than you had anticipated. i would get a another piece of 3mm alum or carbon and make the spacer thicker......or buy a tekno conversion kit.....at least that is what i would do next time if you plan to run mechanical brakes. Mike sells the kits on his site or you can get them from impaktrc.com. good luck.

[starscream]

3mm isn't much
An easy solution to this is to run slightly bigger gears.
What vehicle are you using. What is the current pinion spur? 46/15?
it sounds like 48/16 would fix you up.

You can always run your 17T pinion and set your throttle end point down to 85 or 90% until you get new gears or make a small spacer.

[Ryu James]

cdis,
i was going to suggest that you get a larger spur instead of just trying to make it work with a larger pinion. just take what your ideal gearing is and divide the 2 numbers to get the gear ratio. for example 15/48 is ratio of 3.2 so if you need to go to 50t spur then figure what pinion will get you close to the same ratio and your setup will be very close to what you wanted in the first place. eg. a 16/50 ratio is 3.12. just go up in spur size and this will require a larger pinion also and the result will be a mesh that works with your current spacer. if you already have a 54t spur on then i dont know what to tell you. i havent seen mod1 gears much larger than that.....although i am sure you could find one somewhere.

Yea it is a bit frustrating.

I agree starscreem, 3mm isn't much, but it should be just enough to allow the brake pads to clear the front of the motor. 3mm Alu is just what I have on hand. The problem would be to make up something as accurately as Mike has done for the brake spacer.

The car is a Kyosho ST-RR. It's running the stock 50T spur gear at the moment. I was thinking about getting a bigger spur gear, but no one in Australia carries parts for the ST-RR yet... Should a got an RC8T lol.

Anyway, yea, if I could, I would run a bigger pinion and maybe the 16 or 17t pinion, whichever one fits best.

This is only an issue until the Medusa arrives. I've ordered the 1600kv motor, so I'm hoping that I'll be able to use the 17T pinion with 7s1p A123 and get some decent amp draw and run times.

Thanks Ryu, I didn't know that formula for working out the gear ratio :D

[starscream]

From your picture, it looks like you could go with a smaller brake disc. The smallest disc I know if is the Losi 8ight rear brake disc. A smaller diameter disc my give you the extra 3mm you need.

Righto, so I decided to bulk up the RCM spacer a little to use with my CC NEU until the medusa arrives.

It's pretty rough looking, but it works - can pinions as small as 12T.