Following a dry build of the bottom end (1976 911 2.7 7R) it appears the crank is nipping up. The crank has been ground back .25mm and DTI spot on for each journal. Plastigage also shows ideal clearances.
I can only presume the case is warped, I believe best course of action is to skim the mating surfaces and line bore it (I can reuse my new std outer / .25mm inner bearings)
Anyone recommend somewhere in S. England and approx costs?
Cheers, Jack
crankcase line boring (2.7 7R mag case)
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Diesel76
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Gary71
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crankcase line boring (2.7 7R mag case)
I had my case line honed (so a less dramatic version of what you describe) by Rob Walker engineering in Oxford.
They are now https://fiennesperformance.co.uk/our-story/
Worth a call as they certainly had the competence for this task.
They are now https://fiennesperformance.co.uk/our-story/
Worth a call as they certainly had the competence for this task.
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Diesel76
- DDK Fanatic
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- Joined: Sat Jul 25, 2020 5:17 pm
Re: crankcase line boring (2.7 7R mag case)
Thanks Gary I will give them a call in the morning.