RE: Casting engine block
 

Here is a crankshaft made up by BME for a twin 23.6

They do not have to be absoultly perfect, especially if you are using Gas-Glow.

RE: Casting engine block
 

Wow!!!! Those are very nice photos of that crank assembly. That engine will be a good runner I bet! Have fun flying when you get it in the air. Best Regards Capt,n;)

RE: Casting engine block
 

Wow, that looks good-
What type of welding was done on that crank- is it TIG welded?
Would brazing possibly work?

RE: Casting engine block
 

That is Tig welded by Keith at BME. Brazing wouldn't work as it would overheat the crank and probably wouldn't be strong enough in any case. I mig welded mine, but it was a bear. Tig welding would be the best.

AV8TOR

RE: Casting engine block
 

:eek:

RE: Casting engine block
 

As usual Av8tor you are right.

Although TIG welding is hotter than gas welding it is so much faster that the piece doesn't get as hot.

I also believe it was welded with stainless rod, but I can't say for sure.

RE: Casting engine block
 

Just looking for a method of joining the crank that I could do at home- all I have is a Miller 225 stick welder-
I'd never do something that intricate with it- although I have done some stuff I'd never have thought possible with it before.

I think you are probably right about the brazing temperature and over heating the crank- but then again, after chucking a crank up in the lathe and turning some metal off of it, I think that all the heat treat the crank has is probably a case hardening of the journal. It is quite possible that a brazed joint with full penetration of the
filler into the joint- all the way around would have more strength and less internal stresses than the small surface area of TIG welds I am seeing in the pictures.

If I build one, I will probably just get it TIG welded- to be on the safe side- but the brazing is kinda tempting to me.

RE: Casting engine block
 

When you join the two cranks together the rod bearings are on the crankshaft.
That kind of heat would destroy them.

The $20.00 to have it welded would be a pretty cheap investment.

RE: Casting engine block
 

OK- you got me on that one- I didn't consider the bearings. :)