I'm just curious; how many miles did you put on the engine between those
3 rebuilds?
As to ovality; new pistons are oval somewhat. It's called "cam
ground." The idea is that as they heat up they become round through
heat expansion. Different parts of the piston expand in different amounts.
I have a feeling your engine isn't broken in yet. I'd put 20W50 VR-1 &
a new oilf filter in the engine and take it on the road, driving it
normally. See how the oil consumption is after a couple more thousand
miles.
CR
On 7/7/2014 11:20 AM, Clayton Kirkwood wrote:
> Yes! Ok, I've had my 62 mga engine rebuilt 3 times by "experts". The current
> iteration seems solid - put a couple thousand miles on her. But she sips oil
> modestly. The guy who did the machine shop work for my 59 Land Rover told me
> that most machine shops and rebuilders machine the cylinder walls wrong.
> They make the cylinders round instead of slightly oval toward the bottom of
> the stroke which considers the pull and push rotation of the driveshaft and
> connector arm. Seems reasonable to me.
>
>
>
> So the question. Should I increase the viscosity of the oil to allow less
> oil burn, and/or, go to synthetic which won't burn off?
>
>
>
> Also by now, I'm figuring she has finished running in and plan to change
> oil/filter.
>
>
>
>
>
> "We live in the greatest nation in the history of the world," he pleaded. "I
> hope you'll join with me as we try to change it." Barrie Obama
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