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 Post subject: Re: Pantah main bearings
PostPosted: Mon Dec 18, 2017 8:30 pm 
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Joined: Tue Oct 05, 2010 9:21 am
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Ah there goes my Kevin Cameron Award! I will never be as eloquent!
Maybe my verbiage should have said ....a properly preloaded angle contact bearing will realize its load capacity?
Here is a chart from the Timken engineering book for 15 degree bearings. It shows how deflection (bending) is reduced with increased preload. Deflection = crank failure. There certainly is a limit to preloading but it is an important part of the strength of a Ducati crank assembly.
-Cranky-


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 Post subject: Re: Pantah main bearings
PostPosted: Fri Jan 05, 2018 10:37 am 
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Snow day allowed catching up on some reading. Came across this article that compares the pantah motor to the new scrambler 800. Cranky always likes to see pictures of cranks. Note how the main bearings are now preload and how few balls are in the drive side main. Preload spread over fewer balls creates less bearing deflection?
Also interesting that the 350 crank is a pressed up affair but still plain bearing. Alfred Bajohr did this for the bevel twin back in the 1980s.

http://www.automototech.com/node/39


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 Post subject: Re: Pantah main bearings
PostPosted: Fri Jan 05, 2018 3:43 pm 
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Joined: Wed Nov 17, 2010 5:45 am
Posts: 209
Thanks cranky. Can you check your P.M. Boucher.


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 Post subject: Re: Pantah main bearings
PostPosted: Fri Jan 05, 2018 5:42 pm 
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Joined: Thu Oct 14, 2010 11:23 am
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Neat stuff in there Cranky. Will need to read more than once.
44 and 38 valves - WOW!
MikeV


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