Looks like that's reading "2815" ?? But what the scale is I have no idea!
Standard bore is 2.780"
So - if there is a 2.500 spacer in front of the vernier - then yes, that reading would make sense as 2.500 + 0.2815 = 2.7815 ie 1.5 thou over standard bore ?
Last edited by bmcecosse on Sat Oct 25, 2008 10:22 pm, edited 1 time in total.
Sounds right, as long as your mic has been reliably calibrated! If you are doubting your bore for wear, try a check at the bottom of the bore, which is likely to be correct size. I would say the top above the wear line, but it may have been glazebusted. Glazebusters don't usually get down to the bottom of the bore, or only half-heartedly.
Sorry, yes you are quite right 2.5, I have posted because I would have expected more wear in the bore than 1-1 1/2 thou, I am surprised and started to doubt the reading! thanks.
Excellent! Yes - I recently opened up a 1275 that had been very badly treated - the 'oil' was thinner than water and the sump had a thick (well over 1 inch) layer of black sludge in the base. Yet the bores and the crank bearings are perfect!! Amazing.
I have checked at the bottom of the bore and it may be slightly tighter, but does confirm the mic reading ok. I reckon I can just glaze bust and fit new rings, if available!
. yes/no?
