Question for the experts. I am building up an O-320 from all new parts. My cylinder diameters are measuring -0.0095" smaller at 5.5" from the cylinder base. This is causing my ring gaps too be excessive. Example: If I gap the Oil Ring to the minimum gap of 0.0075" when it is at 5.5" from the base it causes the gap to be about 0.039" in the non-tapered area of the cylinder (1.2 - 4.0" from cyl. base). The spec for the Oil Ring gap is 0.15 - 0.030" in the non-tapered area of cyl.
Superior SL # L04-01 states that "Certain cylinders with a large amount of choke may slightly exceed the maximum gap at the 1.2 to 4.0 location when gapped to .0075 at the top of the ring travel.
I consider 0.039" to be more than a slight amount above the maximum spec of 0.030".
What do you experienced engine builders think about this? Is it unusual to see this much taper in a new cylinder? Is it a problem or not? Will it be an oil burner if built up with the bigger ring gaps?
Thanks,
RomeoMike
Superior SL # L04-01 states that "Certain cylinders with a large amount of choke may slightly exceed the maximum gap at the 1.2 to 4.0 location when gapped to .0075 at the top of the ring travel.
I consider 0.039" to be more than a slight amount above the maximum spec of 0.030".
What do you experienced engine builders think about this? Is it unusual to see this much taper in a new cylinder? Is it a problem or not? Will it be an oil burner if built up with the bigger ring gaps?
Thanks,
RomeoMike