Hi

I am wanting to work out what the internal bore size of the radius arm bushes before its reamed. eg a new one

Anyone have one lying about

Thanks

Kiwiinwgtn

I have a few `strange' kits here from Mini King (strange in that they have 2x bushes in and no needle bearing, so won't fit most Mini arms except 1959-61..)
Anyway, they are a split (ie rolled) bronze bush, and when butted up round are pretty much size for size on the shaft.
I would say after pressing in, only about .005" would need to come out with the reamer, if that.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I was thinking of buying this to ream out the bushes, well something simular



http://www.ebay.co.uk/itm/Morse-Expansi ... 8812690463

Nope you would do better with an adjustable reamer.
You can then adjust the size to fit the shaft.
I use this one-
http://www.machineryhouse.com.au/R726
Cheap but well made.

You will need to tap it then screw a guide on, to ensure alignment between the 2 bushes.


If you have a lathe you can put one end of the arm on the tailstock centre, and the reamer in the chuck.
Like this- (note for illustration only- I need a bigger centre... )

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks or the pic.

Next time you have some verniers in your hand any chance of making a sketch of the pilot part so I can get one made up

Ta

Bernard