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Originally Posted by z12358
OK, pros are no counterbalancing and lower center of gravity. But I'm not quite convinced the 'con' should be waved off just like that. True, gravity pulls everything with a constant force but the most sensitive to it would be any pieces moving at a right angle to this force (like horizontally firing cylinders). There's nothing compensating for this pull. Combined with tight tolerances (cylinders almost touching the walls around them) this will cause stronger friction and rubbing on the bottom vs the top or the sides of the block walls. Over millions of cycles this has to have some cummulative effect. The only question is how large, I would think.
Z
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Funny thing is that I have not experienced the Boxer engines as exceptionally SMOOTH. They are powerful for sure but in my experience, a Lexus V8 and the BMW inline 6 seem to be otherwordly in the smooth dept.
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