Enlargiing transfer ports.

[jonno]

I want to have a go at building up the crankcase transfer ports.Its an old casing and I want to enlarge the ports to take an RB20 cylinder.Going to use a mig (I know ). Any tips re heat,is it best to build up?clean up and add more weld,or do it in one go and clean up after?

[dave411]

[missing lynx]

have you got the use of a lathe or a milling machine to dress the gasket face when you've finished?

[jonno]

Unfortunately,no I haven't. Expect you mean how am I going to get a good enough seal between cylinder and crankcase.Not thought that far ahead yet.

[coaster]

I think you should give serious thought to giving it a decent welder to do, I'm not even sure it's possible to use a MIG for ally most people talk about TIG Then there's heat distortion, it's normal to have to machine a metal plug to fit in the flywheel housing to act as a heat sink.

[jonno]

Think ill knock the idea on the head,and look for a Spanish casing.

[bob]

As said above, don't go anywhere near it with MIG unless it's a pulse set. TIG is really the way to go