Quote:
Originally Posted by Biggles
I ask because 5000 RPM on a car would be harsh.
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But no worse for your car engine that your outboard!
Your car engine will hack that, but the big difference is that your car's powertrain is inextricably linked with the road by the tyres, you therefore need gears to get the ton or so of car moving, which in turn means you can gear it to run at a more economic RPM. If you could fit a variable pitch prop to your outboard / sterndrive, you'd be running a far higher pitch once you were on the plane than you'd need to get out the hole.......
Also can you imagine anyone wanting to sit in a car that is screaming it's bits off all day? (granted, it may be music to some) Most cars are designed to run quietly - the noise of an outboard could be a selling point, but how many of you are sayijg how nice & quiet your 4- strokes are? There are also lots of nice EEC rules to a) keep them quiet and b) not drink / emit too much.
How many outboards are based on "car" lumps?
Remember on a lot of motorbikes 6K rpm is not far off tickover!