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boosted79 boosted79 is offline
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Join Date: Jan 2015
Posts: 1,263
What should I do with these cylinders?

I've been gone a couple weeks so not much progress. I measured the p's and c's yesterday. The ring side clearances are all close to the tight end of spec with the used rings and the skirt diameters are all within a couple tenths of a thou. inch of spec so the pistons will be reused. Here is a summary of the cylinders. This is at 30 mm below top edge.

max. p to c clearance spec. .0059"
max. cyl. wear spec. .00315"
max. ovality spec. .00157"

Actual:
clearance wear ovality
#1 .0029 .0009 .0002
#2 .0022 .0004 .0015
#3 .0028 .0009 .0005
#4 .0025 .0007 .0008
#5 .0019 .0001 .0016
#6 .0032 .0013 .0003

They are all well within tolerance with the exception of #2 and #5 ovality. These are the center cyl's. so maybe they run hotter than the outsides and take this shape? They have the smallest "A" dimension (top to bottom) but the largest "B" dimension (in-line with pin) of all the cyls. There should be little wear in the "B" direction so it must be due to thermal deformation? They both show virtually no ovality at the bottom. So I can run them, try to find two good used in the same diameter and height group (1&6) or send to US Chrome. I really don't want to
re-install them as-is so I guess I'll work on the other options. Suggestions?
Old 03-05-2016, 06:59 AM
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