I've spent a lot of time thinking about the barrels as well. This is where I'm headed with it. I can make these as big as anyone wants, in just about any configuration. Still in testing, this is a 186cc (64mm bore) carved from a block of aluminum. Iron liner. Transfer area is about that of an RB225. I've used just about all available area in between the studs. The next logical step is to move the studs. Weld up the base and I can put the studs any damn place I want....and build a barrel to suit. This barrel is assembled and running, but I'm currently buried in snow. Hopefully the roads are clear in the next week or two!Adam_Winstone wrote:OK, old thread but I've just come across it... and it happens to be an issue still close to my heart.
My mind has played on this for a long time but I still keep coming back to needing a barrel with a thicker wall. Even if you plug the stud holes and bore out, you soon run out of bore wall. Little point of going beyond the bore wall and fitting an iron liner as you still need enough meat in the barrel to run the transfers down.
What we really need is a barrel that is just BIGGER, with thicker walls, bigger transfer casting and longer barrel for long stroke increase. I'd happily sacrifice a casing and have the mouth machined off and a bigger mouth welded on (as the Germans/Austrians used to do to convert small block casings before SIL 200s became readily available). The problem I keep coming back to is barrel... and I don't really want to change to a bike barrel
Adam
The other main issue we'll run into is getting the bore/stroke ratio too "over square". Big bore is gonna need big stroke or detonation is gonna be problem.
Billet Barrel by MrLloyd007, on Flickr
DSCN0837 by MrLloyd007, on Flickr
