Hi all, I am finally putting my A65s back together, after yrs of Triton building. Desperately need specs on conrod big end eye sizes, as they are a in need of resizing. I have mic'd them up and have a rough of 1.844". Can anyone confirm this, or give me the correct size, please?? Any help greatly appreciated.
There is no spec given in the factory literature. My personal conclusion from this is that, it is only indirectly consequential and really only secondary to the really critical measurements. I tend to depend on big end diameter with bearings installed and ovality of the rod eye. Ovality of more than .0010" means the big end has stretched, the material has yielded and the rod is likely due to fatigue and fail. I would throw such a rod away. For diametriacal clearance, I install a bearing set and torque the rod bolts. The bearing should measure no more than .002" bigger than the rod journal. If requiring a regrind, I spec a clearance of .0015".
Hope that helps even if it doesn't directly answer your question.
A smattering: '53 Gold Flash '67 Royal Star '71 Rickman Metisse '40 Silver Star '37 Rudge Special sixtyseventy Lightboltrocket road racer...and many more.
I suspected ovality on one of my rods, but do not have the tools to measure accutately. When I installed the bearings I checked for clearance with plastic gauge for .0015". I noticed however that one rod had an ever so perceptible tight spot when rotated whereas the other rod spun like it was supposed to. I took the crank, rod and bearings to my machinist who felt the rod and resized with a hone setup for that purpose. I reassembled the rod with him present and it felt perfect and only cost $25. Been running fine ever since.