Do you really mean 0.05mm oversize? That sounds more like a hone than a rebore.
Do you have standard size pistons?
Check the ring gaps to be sure, but I'd think it'll be a bit loose.
Thread: Engine Cylinder Bore Oversize PG -G60  |
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Started 4 months, 2 weeks ago by Richardshoes
Hi guys.
What would happen if I installed new rings and re-fitted pistons into an engine that has 0.05mm/0.002" oversize bores?
I think this will cause more loading on the rings as the piston pivots on the gudgeon pin.
The Bentley Manual states 81.01 +/- 0.08mm - I am reading 81.14mm
The pistons are within limits.
Cheers.
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Mike_H replied 4 months, 2 weeks ago
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Richardshoes replied 4 months, 2 weeks ago
Yes 0.05mm above top limit.
The old rings have a 1mm gap which is the maximum allowable wear limit.
I have yet to order new rings, but they will likely have more meat on them, bringing the gap in a bit.
So other than the gap being big, would there be any other adverse affects caused by the big bores?
The pistons are standard size and I honed the cylinders to remove a ring ridge.
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Mike_H replied 4 months, 2 weeks ago
I'm not sure... hopefully someone else will read in and comment.
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tinydubs replied 4 months, 2 weeks ago
from what you have said the bore is 0.05mm too large, the max size would
have been 81.09mm,doesn`t seem like a lot but at the speed a piston moves,
new pistons i think.
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Richardshoes replied 4 months, 2 weeks ago
I am trying to refurb an engine on a budget. Therefore I'd like to re-use the main components.
All bores read on average about 81.14mm - Bentley spec: 81.01 +/-0.08
All piston skirts come in at 80.95 - Bentley spec: 80.985 +/-0.04
The gap on the new rings will most likely be outwith new bore/ring tolerance but well within the wear limit of 1mm.
The piston can pivot a larger angle on ...
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brian.g replied 4 months, 2 weeks ago
.05 over max limit? slap them in with new rings youll be fine, Ive put back
far worse on owners commands/budget with no issues(within reason of course)
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