In a message dated 12/7/00 10:24:10 AM Pacific Standard Time,
steven@cravetechnology.com writes:
<< Mark, the advice I've received against boring goes something like:
The thinner walls of the bored liner may contribute to overheating issues
slightly. While it'll cost slightly less to bore the old liners, it's likely
a
false
economy. The 87mm liners are engineered for 87mm pistons, get a
matched set. >>
I don't think is would lead to overheating at all. The amount of cylinder
temprature is the same with thick walls or thin. Thinner walls do have a
greater tendancy to flex and cause poor ring wear / blowby. If the OD of the
head gasket side of a 83, 86 sleeve is smaller than a 87 there could be
sealing problems allowing combustion pressure to enter the cooling system.
If the 83 and 86 are bored to 87.
The way to end the speculation would be to measure the OD of a 83mm sleeve,
86mm and 87 mm. If the OD at midpoint is the same, there isn't any
advantage to run stock 87mm over a bored 86 or 83.
Harold
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