| [ Total Views: 540 | Total Replies: 4 | Thread Id: 93973 ] |
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 Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
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| posted on November 23rd, 2011 at 09:40 PM |
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Big end bearing sizes for a Type one
What is the largest "under sized" big end bearing for a type one crank ?
I've heard they go up to 2mm under sized, but that sounds extreme !!
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 matberry
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| posted on November 23rd, 2011 at 09:52 PM |
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My 1st thought and 1st check in a suppliers catalog goes to +1.5mm
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
Posts: 8040
Threads: 347
Registered: January 10th, 2003
Member Is Offline
Location: Sydney
Theme: UltimaBB Pro Blue ( Default )
Mood: Time to go Salt lake racing, and actually achieve a result.
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| posted on November 24th, 2011 at 02:53 PM |
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cheers
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psimitar
Son of Jim - Creator of Good
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| posted on December 3rd, 2011 at 11:01 PM |
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the 2mm is only for the thrust bearing. Journals I though only go to 1mm as beyond that there is no casehardening left on the crank.
Yea, just checked and 1mm crank, 2mm crankcase and 2mm thrust.
madness is in the eye of the beholder  |
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matberry
Super Moderator
Go hard or go home
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| posted on December 4th, 2011 at 07:37 AM |
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I think you'll find 1.5 BE bearings. Mains come in up to 2.0mm on the back (case) and .75mm on the crank. Re-nitriding is possible to re-harden the
crank. This is done to all modified and some reground cranks if done right as the nitriding is only around .005" deep (iirc).
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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