OS After Run Rituals

[Dean Pappas]

Hi Earl, Hi All,
Ball bearings have "point" contacts, which is only true until pressure squashes the metal into small patches.
More balls are good, as long as they don't shrink. Bigger balls are good (you should have seen this cat my buddy Steve owned!) and get better faster than proportionally to diameter. Roller bearings have "line" contacts and are even better.
Generally, pinging is the culprit with contact stress fatigue. How about bushings?
Dean P.

-----Original Message-----
From: EHaury at aol.com [mailto:EHaury at aol.com]
Sent: Thursday, June 19, 2003 11:19 AM
To: discussion at nsrca.org
Subject: Re: OS After Run Rituals


This is an excellent observation. While rust can certainly do in a ball bearing, by far most of the bearing failures we see are load failures. The larger the prop and higher the nitro the tougher it is on the rear bearing. As 2-strokers have mostly downward loading on the bearing, they seem most critical. Interesting that the 3M Mintor folks have chosen a double row bearing for the 170. 

Does anyone have comparative load ratings for single and double row ball bearings of the same external dimensions? How about larger / smaller / more / fewer bearing balls in the same external dimension races? 

Earl 

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