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Old 11-21-2004 | 07:05 PM
  #275  
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InitialD
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Originally posted by Top Gun 777
It is not bearing problem. It is the way how lubrication system was designed problem. To prevent oil leaks from front bearing (which is not bad thing in reasonable ammount) on most RC cars engines engineers make path from induction area (under the carb) to suck oil from that area. So no oil is going to front bearing and it is failing pretty fast. If you cerouse to see, you can look under the carb, on front side of the carb's hole, right before crancshaft, you fill find small hole driled looking to front bearing, then on crancshaft you know the is grew right before it is going to 7 mm diameter. So vacuum which is creating in carb is sucking out oil back from that are and no oil going to front bearing. Very simple and this is killing front bearings. I can sugest to plug that hole and it will fix front bearing problem, but be ready it will be some ammount of oil coming out from front bearing. It is up to you do it or not.
Edward
Ed, I don't think it's a lubrication problem. How then that a ceramic one fails but not when you put back a normal front bearing? Ceramics need more lubrication?
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