a ridge at the top of the bore won't necessarily score the piston. It's
more likely that the ring gap was too small. I use 0.04" per inch of
bore. So at ~3.5 inch bore one should have 0.14" +/- a thou. gap.
Dave P.
On 9/16/2014 3:17 PM, terryrs@comcast.net wrote:
> Okay. I rebuilt my TR3A stock engine, used 30 weight non-detergent for a
> break in period, then switched to Mobil 1 fully synthetic. All good.
> Then...engine was overheating. Investigation led to a cylinder sleeve that
> the machine shop cracked when honing (I say honing because they didn't remove
> the lip at the top).
> Removed and replaced the cylinder sleeves and the now scored pistons.
> Question: I've been running the same full synthetic oil. But what does that
> mean for seating the new rings?
>
> Terry Smith, '59 TR3A
> New Hampshire
>
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--
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
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