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Post by fraserc on Apr 30, 2011 22:08:17 GMT 1
Guys,
Can anyone help me decide if i can mix a set of upper and lower 4L0 crankcases.
I have a frame and matching set but the lower half has the usual chain damaged part. I have a much nicer complete lower half but am not sure what the issues might be by not matching them as a pair.
any comments welcome
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Post by LC'Adam on Apr 30, 2011 22:16:58 GMT 1
As a general rule, I would advise that you didn't mix up crank cases. I would see if it is possible to repair the chain damaged case if you want to keep it matching numbers. It would be well worth paying out to get it fixed in the long term.
Adam.
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Post by winnerevo1 on Apr 30, 2011 22:19:40 GMT 1
The two halves are machined as a pair to ensure that all bores that start off in two halves are round, parallel and the correct size when bolted together.
If you use two un-matched halves you cannot ensure the above.
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Post by rigga on May 2, 2011 16:37:38 GMT 1
Cases are generally line bored,so it wont work.
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Post by mark350lc on May 2, 2011 19:23:17 GMT 1
I know it's not recommended but I tried it a few years ago. Spoke to Terry Shepherd about it. He told me they all machined so close it should not be a problem. It wasn't, bike ran fine.
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Post by bare on May 2, 2011 23:30:20 GMT 1
It's true... but sometimes you get a real mismatch and then it doesn't work and you have start all over again.. THAT is what the risk actually is :-)
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Post by zakperrin23 on May 3, 2011 1:41:39 GMT 1
just wait for a pair to come up  |
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Post by billbott on May 3, 2011 7:23:33 GMT 1
Get them measured on a CMM (co-ordinate measuring machine)
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