Boring out 3 brg crankcase for 2 brg crank - Printable Version +- Austinsevenfriends (https://www.austinsevenfriends.co.uk/forum) +-- Forum: Austin Seven Friends Forum (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=1) +--- Forum: Forum chat... (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=14) +--- Thread: Boring out 3 brg crankcase for 2 brg crank (/showthread.php?tid=9381) |
Boring out 3 brg crankcase for 2 brg crank - Austin in the Shed - 22-05-2024 Anyone know what diameter cutter I need to use to machine out the centre bearing to clear the crank? RE: Boring out 3 brg crankcase for 2 brg crank - Peter Clayton - 23-05-2024 You could give VINCE LEEK a call he doesn't do this mod any more (now semi-retired) but may be able to give some advise. RE: Boring out 3 brg crankcase for 2 brg crank - Robert Leigh - 24-05-2024 I have just measured the one Vince Leek did for me a few years ago; as near as I can judge it's 4.75 inches diameter. I took a picture which I hope is of some use. Vince also put diagonal grooves in the camshaft centre bearing so that splash would spread oli into it. I think it is unlikely that I shall use this crankcase, so I am open to offers. RE: Boring out 3 brg crankcase for 2 brg crank - Austin in the Shed - 25-05-2024 Thanks for the reply Robert. In the end I measured a two bearing case,well the thickness of the aluminum casting surrounding the bearing sleeve and took that away from the crank / cam centres and got a similar figure to you. I did speak to Vince for his advice which was very helpful,I’ve never machined one out before in thirty odd years.I’ll post a picture of the set up of how it was done when in the workshop. RE: Boring out 3 brg crankcase for 2 brg crank - Austin in the Shed - 25-05-2024 Here in the lathe,I did consider doing it on the Bridgeport as I can get around 2’ between spindle and bed if necessary but settled for this. RE: Boring out 3 brg crankcase for 2 brg crank - Robert Foreman - 25-05-2024 Good work with the flying nail Dave. |