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re: Outboard Motor Experts...
Posted on 7/12/20 at 8:15 am to GoAwayImBaitn
Posted on 7/12/20 at 8:15 am to GoAwayImBaitn
quote:
and cheaper to make
I dont think so. Your logic is good with one less head, but the bottom end of an inline has more bearings, a longer crank, longer block, etc. I dont think theres too much appreciable difference in the overall build cost.
I think it has more to do with overall power density. You can cram more HP under a smaller cowling with a high revving V engine, I dont think the overall trend is much more complicated than that.
Some other possibles,: Once the power started getting far beyond 115 the blocks get taller and more difficult to cool upper cylidners. They also need to be heavier built as they get taller since gyroscopic forces increase the higher up you put the flywheel. Probably some torsional vibration problems as well since outboards dont have viscous dampers and inlines tend to be more torsionally abusive than V engines.
2
Posted on 7/12/20 at 9:09 am to DownshiftAndFloorIt
quote:Dang.
Probably some torsional vibration problems as well since outboards dont have viscous dampers and inlines tend to be more torsionally abusive than V engines.
I knew you're one of the smartest, most analytical members on this forum, but this may set a record.
Posted on 7/12/20 at 5:21 pm to DownshiftAndFloorIt
quote:
I think it has more to do with overall power density. You can cram more HP under a smaller cowling with a high revving V engine, I dont think the overall trend is much more complicated than that.
Some other possibles,: Once the power started getting far beyond 115 the blocks get taller and more difficult to cool upper cylidners. They also need to be heavier built as they get taller since gyroscopic forces increase the higher up you put the flywheel. Probably some torsional vibration problems as well since outboards dont have viscous dampers and inlines tend to be more torsionally abusive than V engines.
Interesting take considering today's Yamaha F115'are inline 4 cylinders.
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