mk e wrote:
I just need to decide what to tell them for rod and main clearance so they know what size to finish the crank...I'll think about that in the morning when I'm less tired I guess.
Good that I waited until morning because I'm more than confused at the moment. Looking at the 400, 308 and QV manuals the nominal main clearance is .0018 and nominal rod is .00266.....those numbers SEEM backwards. The 328 section is asking for tighter on the mains.. the bearing people say 3/4-1 per inch is typical making those numbers exactly backwards.
Those are the nominal numbers the range is
Rod .00181-.00350
Main .00114-.00252
There is overlap and I could just use the normal numbers which would put the rods right at the bottom of the factory spec....and my rods are 360 so not sure what the factory spec is for them, I found a 355 manual but it doesn't specifically give a clearance spec that I can find....the numbers on the journal, rod, bearing are all very close to 308 ...rod bore is exact, bearing a touch thinner, crank a touch larger so it adds to about the same numbers. Mains are the tighter 328 spec of .00126
I'm ASSUMING they have found the block is rigid so mains can be run tight but rods flex and need the clearance....not sure. Its raining today so I'll load up and head to the shop tomorrow giving me another day to think.