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Old 12-17-2007, 05:10 AM   #1
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Default tuning a pinion-diff

Hi, I'm driving a Tamiya Swift car, which is based on the M-03M-chassis.
It is Front-Wheel-Driven and has a Pinion-differential. Tamiya has a optional Ball-diff for this car but I was wondering how I could tune the original diff.
I like the fact that a pinion-diff can never slip, which a Ball-diff can.

I know a pinion-diff is used in nitro-cars, I guess for the robustness of this system. I also know that there, these diffs are tuned by using different kinds of oil in the diff, so with different viscosities.
The problem on this Tamiya-Swift-diff is, that it is not sealed so I can not use oil to tune it.





I read somwhere that someone stucked it full of grease. I tried this and indeed the diff became "stiffer" which was exactly what i search for. Unfortunatly, after some runs, the grease was swepped to the sides (and out off) and my diff was again spinning freely and very nicely.
So it is very good "lubed" but that is not what i'm looking for .

Also, I want to stiffen it, not block it. Some guys told me they filled it with silicone and therebye glued it together.
This method has three drawbacks:
  1. you end up NOT with a diff but a kinda spool (which is not what i want),
  2. this way, the Swift seems to "eat" pinions and spurwheels.
  3. This is a non-return mod.

Anyone has some tricks on how I could stiffen this diff?
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Old 12-17-2007, 07:05 AM   #2
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Can't you pack the diff full of the grease you used and then silicone the gap between the cover and gear? It may help keep the grease in a little longer. Without being o-ring sealed though, I am not sure there is an absolute long term solution other than the ball diff.
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Old 12-17-2007, 07:12 AM   #3
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Quote:
Originally Posted by Xpress View Post
Can't you pack the diff full of the grease you used and then silicone the gap between the cover and gear? It may help keep the grease in a little longer. Without being o-ring sealed though, I am not sure there is an absolute long term solution other than the ball diff.
With a diff of that sort, this sounds like your best option.
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