OK, so let's say you were going to build a bike from bits and had a choice of cases.
small block stuff (some may be redundant here)
-p series 3 port
-125/150 with 3rd port cut and some porting by a p.o.
-2 port cases
Said hypothetical engine would go in a VBB, and I'm thinking something like birdsnest built - pinasco 177, etc. (which is 2 port but sounds like he's really enjoying). Let's say I'm definitely not going down the high revving screamer route this time.
The deal is I don't understand the difference in all of these cases. I've only been exposed to the later P stuff and small frame stuff. What are the advantage / disadvantage of these? Which ones have 2 or 3 ports? Which ones use the split crank bearing? Should I care? It seems easier to me, but I've never tried splitting or reassembling with the full bearing on the crank. The engine would be premix, so autolube isn't a concern.
Is there a reference out there somewhere that breaks down what changed and when in the case varieties? I tried search but this one is hard to figure some key words for that will get you the right search result.
Last edited by sdjohn on Thu Oct 15, 2020 12:20 pm; edited 1 time in total