Hi
Maybe asking the impossible looking for set of T140 crankcases unstamped to bring back engine to original circa 1983 TSS.
Do crankcases from other years useable or are they specific to model
Cheers
Sounds like one for @iron. He’s our resident old Bonneville expert, among other things.
If @Iron comes around, he may have some insight.
Edit: Simultaneous answer (hopefully we agreed 
=
I’ve read of TSS cranks being used in T140 engines but that they require special conrods being made up due to the TSS crankshafts having larger diameter but narrower journals (the conrods are about half an inch further apart).
So, in theory, if the cranks can be made to work in a T140 engine then T140 cases should work in a TSS engine.
It’d be worth to get someone to measure the crankcase barrel opening dimensions in a T140 to compare with the TSS barrels before you go and buy some. That’s if you can find some (I have seen unstamped ones for sale occasionally).
I’ve no engines open at the moment (none planned either) so I can’t help much.
Thanks, dont think crankshaft comes into it as iits designed for off set conrods. Theres a good artical on old Sump mag
Cheers
BBM
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