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RC10B4/T4 Forum

Old 03-01-2010, 12:24 PM
  #11671  
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Originally Posted by not home View Post
tuning options, such as rear traction, smaller spurs=motor closer to the rear wheels for traction. they do affect acceleration, in a way...a higher fdr comes from larger spurs which is more acceleration but less top end. different sized spurs for getting a fdr. a small spur is used for motors with higher numbers of winds such as a 17.5, you need a very low fdr for get a 17.5 to work well which a smaller spur will do. if you use a 87 with a stock, you will run out of room for such a large pinion, and people dont mike pinions that big to achieve a fdr so low with a 87 spur. the smaller spur lowers you fdr so you have room for larger pinions needed for 17.5 and 13.5 and so on.

larger spurs are used with lower wind motors such as a 7.5. you need a higher fdr for them which the larger spur creates. if you use a 72 spur, then you need such a small pinion gear to create a higher fdr, i doubt you can find a pinion gear that small anyways, plus you probably cant get the pinion to reach the spur. thats why they have different spurs.

So if I put in a 17.5 express duo2 with a Tekin RS I would want to go with say a spur in the 70's, but if I go with a castle creations 4600kv or 5700kv then a larger spur gear maybe even the stock 87 would be better.
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Old 03-01-2010, 12:39 PM
  #11672  
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an 81 would sound good with the mamba, a 72 is perfect for 17.5
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Old 03-01-2010, 02:05 PM
  #11673  
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Originally Posted by Davidka View Post
I can see how that could happen, though luckily it's never happened to me. Seems like a fix for a problem that rarely happens. I still think it's caused by a poor tolerance in the spacer allowing the bearings to be excessively side loaded.

Never happens to me either Dave with the improved bearings and hub...

No poor tolerances involve at all, , just using the wrong crush tube...

A losi car is stuck and the same problems using 3/8 bearings, they don't have the larger & stronger bearings available like Ae does .
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Old 03-01-2010, 02:15 PM
  #11674  
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Originally Posted by Wild Cherry View Post

No poor tolerances involve at all, , just using the wrong crush tube...

A losi car is stuck and the same problems using 3/8 bearings, they don't have the larger & stronger bearings available like Ae does .
We're missing each other here I think. Nobody with the stock B4 is using the wrong tube, they're using the stock one that comes with the kit. I have run both AE and Losi cars for many years. The recent AE cars seem to eat the rear bearings more quickly, the Losi's don't (My XXXT's rear bearings are 3-4 years old), in fact many of the team drivers have been converting away from the larger hub/bearings of the QR setup on their stadium trucks to save weight, not something anyone would do if they were knowingly sacrificing durability or reliability.

Again, I think the tolerance stack between the hub mold and the crush tube is off, the bearings are side loading.
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Old 03-01-2010, 02:19 PM
  #11675  
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I am getting closer to understanding spur gear selection. I need some help from anyone with experience in these setups. Looking for spur/pinion combos for an indoor clay track with a T4.

option 1: Tekin RS with express duo2 motor (17.5)
option 2: Castle Creations sidewinder with 4600kv
option 3: Castle Creations sidewinder with 5700kv

THANKS IN ADVANCE
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Old 03-01-2010, 02:29 PM
  #11676  
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There's no right or wrong number for spur gear selection. The basic story is, if you need a really tall gear (like you'd need for 17.5), you will run out of adjustment range with the huge pinion you'll need to get there with a stock spur so you choose a smaller spur to allow you to get there. Opposite for the need for a high ratio.
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Old 03-01-2010, 02:29 PM
  #11677  
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Too funny Dave , I don't even know what your talking about , the parts fit great and their life span last even longer than a Lois equip with just 3/8 bearings...



The smaller bearing is weaker , not cus its a Losi or a Ae bearing .



Cpt, the crush allows you to tighten down the wheel nut with out crushing the bearings ....


Scott has the part and don't feel bad .
Common mistake actually...
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Old 03-01-2010, 02:35 PM
  #11678  
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I've been running the B44 rear hubs on my B4 for months on the same bearings... but I only use Avid bearings, AE's suck
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Old 03-01-2010, 02:37 PM
  #11679  
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Ae bearing's are just as good as any available..


I know cus I use them all....
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Old 03-01-2010, 02:40 PM
  #11680  
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Of course they are


Hey if you talk to Bridgewater can you have him check his PM's? I know he doesnt get on here much but this is the only way for me to ask him something
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Old 03-01-2010, 02:45 PM
  #11681  
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Originally Posted by Wild Cherry View Post
Too funny Dave , I don't even know what your talking about , the parts fit great and their life span last even longer than a Lois equip with just 3/8 bearings...

The smaller bearing is weaker , not cus its a Losi or a Ae bearing .


My point is there was never a need for a bigger bearing in this position.

It's not the bearings I'm talking about, it's the accuracy of the assembly. The Losi's fit is better and it's bearings last way longer. I have both cars, the AE's wear fast, the Losi don't. I have not tried the larger hub/bearing combination because I added a shim the tube between the bearings and the binding went away.
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Old 03-01-2010, 02:51 PM
  #11682  
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Originally Posted by Tony Newland View Post
I've been running the B44 rear hubs on my B4 for months on the same bearings... but I only use Avid bearings, AE's suck
Boca Bearings Are Also Great.
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Old 03-01-2010, 03:15 PM
  #11683  
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Originally Posted by Davidka View Post
There's no right or wrong number for spur gear selection. The basic story is, if you need a really tall gear (like you'd need for 17.5), you will run out of adjustment range with the huge pinion you'll need to get there with a stock spur so you choose a smaller spur to allow you to get there. Opposite for the need for a high ratio.
What exactly is a "tall gear". Sorry, but I am still learning each day about this stuff and I have been doing this a year now!
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Old 03-01-2010, 03:26 PM
  #11684  
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Originally Posted by storytyme View Post
What exactly is a "tall gear". Sorry, but I am still learning each day about this stuff and I have been doing this a year now!
Tall refers to the ratio and "going taller" tends to mean more teeth on the pinion.
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Old 03-01-2010, 03:26 PM
  #11685  
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I run a 78 in my truck becuase the 87 would put the motor to far back. It would give you tons of forward bite but when it comes time to turn your just going to push. With all the torque brushless motors have you need to keep the motor forward to get the vehicle to turn on power.
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