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Why is the spur gear so exposed?

Why is the spur gear so exposed?

Old 04-13-2012, 05:07 PM
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Default Why is the spur gear so exposed?

Just a question. We took my mates new truggy for a bash at the BMW track, it was cut short after 30 secs when a tiny stone stripped the spur gear. Makes me wonder why the spur is exposed on most buggy/truggy chassis'? Can it not be raised up a few mm.? Why does it need to be exposed?
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Old 04-13-2012, 05:44 PM
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Originally Posted by Coopz View Post
Just a question. We took my mates new truggy for a bash at the BMW track, it was cut short after 30 secs when a tiny stone stripped the spur gear. Makes me wonder why the spur is exposed on most buggy/truggy chassis'? Can it not be raised up a few mm.? Why does it need to be exposed?
center of gravity

you can raise it all you want with shims
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Old 04-13-2012, 05:46 PM
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Fair question, but it's been tried so many ways over the years and it keeps coming back to the simple, open design. The gear is as low as possible for performance reasons. You coule just cut the slot in the chassis part way through, but it just ends up trapping dirt from above and doing more damage. Likewise on the "covering" the gear. Any type of cover adds weight, and they also trap dirt. The gears stay cleaner with a good cover, but once you trap some dirt inside, it doesn't come out and can cause more damage.

In the end, it keeps the costs down, and the amount of weight a proper cover would add to the car has never really made sense.
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Old 04-13-2012, 07:06 PM
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There is really no practical way to "totally enclose it" which is the only way the problem is really solved - ie front/rear diffs.

But just as a note I preffer the durango/ae style of having the chassis covering it. But who cares what I want
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Old 04-13-2012, 08:49 PM
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Jq and AE have a closed chassis under the spur.
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Old 04-13-2012, 09:02 PM
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So does Agama
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Old 04-14-2012, 10:47 AM
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Do you guys have any issues believe most leave open so dirty rocks can pass without stopping the spur
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Old 04-14-2012, 11:41 AM
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Originally Posted by bigjayjay1 View Post
Do you guys have any issues believe most leave open so dirty rocks can pass without stopping the spur
Unless your running without a body rocks should never be a problem.
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