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49vwsplit
Samba Member
Joined: March 23, 2011
Posts: 111
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 Posted: Mon Jan 10, 2022 7:18 am Post subject: AA Cylinder Bore Dimensions |
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I just received a set of 36hp - 76.95/77mm P&C from CIP1. Using my telescopic bore gauge, I measured all 4 cylinder and then extracted those measurement using my micrometer. The mic was zeroed in 20C (68F) garage temperature.
The manual states the nominal size of the cylinders should be:
76.990 (3.0311) to 76.999 (3.0315)
The AA cylinders are all:
77.015 (3.0321) to 77.020 (3.0323)
Isn't the wear limit of cylinders 0.1mm (.004)?
Right after, I measured another set of NOS cylinders I got from a Samba member that all measured right in at 76.993 (3.0312). Should I return the AA's?
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RolandD
Samba Member
Joined: January 15, 2017
Posts: 247
Location: Menomonee Falls, Wis
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| Posted: Mon Jan 10, 2022 4:38 pm Post subject: Re: AA Cylinder Bore Dimensions |
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Did you measure the piston to bore clearance? maybe the pistons are equally oversize.
Roland |
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RWK
Samba Member
Joined: June 24, 2009
Posts: 1347
Location: S.W. MI
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| Posted: Tue Jan 11, 2022 7:57 am Post subject: Re: AA Cylinder Bore Dimensions |
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Also check for out of round, spec is with in .0004
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RWK
Samba Member
Joined: June 24, 2009
Posts: 1347
Location: S.W. MI
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| Posted: Tue Jan 11, 2022 7:59 am Post subject: Re: AA Cylinder Bore Dimensions |
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Better to be .001 oversize then out of round .001
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73 Type 181
63 Type 113
63 Type 261- 428 071
62 Type 241-378 025 178 530 |
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Lingwendil
Samba Member
Joined: February 25, 2009
Posts: 3988
Location: Antioch, California, a block from the hood
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49vwsplit
Samba Member
Joined: March 23, 2011
Posts: 111
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| Posted: Tue Mar 01, 2022 2:42 pm Post subject: Re: AA Cylinder Bore Dimensions |
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| RolandD wrote: |
Did you measure the piston to bore clearance? maybe the pistons are equally oversize.
Roland |
BINGO, it was that the pistons were oversized as you suggested. Since the cylinders measured slightly over, all is good and the overall measurements are well within spec.
_________________
Officer: License and registration please.
Driver: What's the problem officer?
Officer: It indicates here you require glasses to operate a motor vehicle.
Driver: It's OK officer, I don't wear glasses..I have contacts.
Officer: I don't care WHO you know!! |
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PEPPE
Samba Member
Joined: August 24, 2003
Posts: 1068
Location: Roma Italy
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| Posted: Sun Jul 31, 2022 3:10 am Post subject: Re: AA Cylinder Bore Dimensions |
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| too often the cylinder are bigger than needed and pistons are smaller than stamping. it's better to purchase more sets then mixing the parts to get better tolerances. sometimes good used barrel are smaller than new AA and can solve problems. |
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