04-02-2020, 07:21 PM
Hi All
I’ve now got to the trial assembly of the 11/2 crank and Nippy rods in my standard case. I was quite surprised not to have more clearance issues but in truth there is really only one. The big end bolt heads. Following on from this thread I’ve installed M8 cap head bolts which work well on one side of the block but don’t clear the camshaft on the other.
I was prepared to turn down the camshaft between the lobes but I’d need to take a lot off to clear the cap heads. So I’ve ordered some button head “bolts” which are actually “set screws”. I may be able to get away without turning down the camshaft.
Question... My structural engineering background tells me there is no difference in axial strength between bolts and screws, but the bolt shank is stronger in shear. I think the main force in a big end fastener is axial so any reason that I need to use bolts rather than set screws?
Cheers
Howard
I’ve now got to the trial assembly of the 11/2 crank and Nippy rods in my standard case. I was quite surprised not to have more clearance issues but in truth there is really only one. The big end bolt heads. Following on from this thread I’ve installed M8 cap head bolts which work well on one side of the block but don’t clear the camshaft on the other.
I was prepared to turn down the camshaft between the lobes but I’d need to take a lot off to clear the cap heads. So I’ve ordered some button head “bolts” which are actually “set screws”. I may be able to get away without turning down the camshaft.
Question... My structural engineering background tells me there is no difference in axial strength between bolts and screws, but the bolt shank is stronger in shear. I think the main force in a big end fastener is axial so any reason that I need to use bolts rather than set screws?
Cheers
Howard