Height gauge addition.

[tonyfoale]

Tony
I know this thread is about measuring but the new engine casing project you posted looks really interesting. Have you increased engine performance over the years to a point the originals are over stressed or maybe stiffer/slimmer ones with your own crank for higher RPM. I hope we get to see the finished ones.

Alan,

There are several reasons for the new cases but the principal one is to be able to accommodate a larger bore. There is a limit to the bore size in the crankcase mouth before running into the stud holes. 78 mm is about the maximum without making the cast iron liner too thin as well. With the new cases I'll be able to go to 92 mm at a push. The new cases will also be a bit heavier to increase rigidity. Stiffness is all important in the bottom end and I'll also be using a short stroke one piece crankshaft in place of the stock built up shaft.
With the new cases and crankshaft I should have a bullet proof bottom end which will support whatever power I get from the top end.

I'll take some pix of the current progress and post some here in the next day or two.
An interesting aspect is how I plan to ensure alignment of the bearing bores in the two halves. Both halves have to be bored separately for several reasons. if I get a moment i'll write that up or maybe make a video.