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A Plus Crank In Early Pre A Plus Block

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#1 nicksapheno


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Posted 10 April 2019 - 08:46 AM

Hey guys,


have searched the forums to no avail...


Im building a 1380 at present and have a couple of early 1100s (1275) blocks these are the pre a plus type.


Both are missing cranks.. 


I have a cooper s crank and also an A plus large journal crank. 


Is there any modifications required to fit an A plus crank into a pre a plus block? 


Being from Australia its not as simple and getting hold of a newer block as they are rare... only know of a handful from Japanese imports.


Any advice appreciated.




#2 nicklouse


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Posted 10 April 2019 - 08:52 AM

No issues. the only real differences were the introduction of the rolled radii on the journals and this was an improvment.

#3 Moke Spider

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Posted 10 April 2019 - 09:22 AM

Hi Nick on the other side of The Island,


The A+ Crank will go in OK but carefully measure the journal sizes if it hasn't been ground and check them against how ever's bearing shells you are using.


If it's been reground at some point, this is not an issue. If it's as original, there were some small variations here in journal sizes which are identified by dabs of paint on the crank webs. Off hand, there was 4 sizes here. The variations are only small, but given than normal running clearance is of 0.001 to 0.0027", if will make a difference.


The Cooper S Crank will fit, but you'll need special over size thrust washers, which you should be able to get easy enough.

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