Question:
Why are motorcycle engines able to operate at RPM's such as 12,000 and above? Whereas car engines are much lower. the highest you really see in production cars is 8500-9000.
Answers:
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Physics; moment of inertia. Try a little demonstration:Honda XL250 question, second attempt.?
Take a gallon of milk and swing it as fast as you can back and forth at arm's length, then do the same with an empty bottle. It was a lot easier to swing the empty bottle faster, right?
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Car engines have much larger displacement, which means that their pistons are larger and heavier than a motorcycle's pistons. Since pistons have to move back and forth like your gallon of milk, a smaller (and therefore lighter) motorcycle piston can naturally go faster without tearing the engine apart.
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You'll also notice that a larger motorcycle engine, like an 1800cc cruiser, will only rev to around 5,000 RPM. Again, larger pistons mean more torque but lower engine speed. Since the throttle is an important control in a sportbike, engine torque and the gyroscopic effect of smaller pistons makes the bike easier to ride as well.
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Shorter stroke pistons - they don't travel up and down as far as low rpm engines.Crankshafts and flywheels are lighter - which allow them to spin faster without a lot of weight holding them back.
They're smaller, so the pistons are lighter and they are less heavily stressed by high redlines. Also, sportbike engines aren't expected to last 150,000 miles like a car engine.
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Smaller lighter valves don't float as soon.Now who says bikes run at 12,000+ RPM. My hog would blow up shortly before hitting 7 grand. (It's stock. The redline is at 6.) Thing is, the 'ol hog ain't quick, but I can carry lots of stuff. Stuff a 12,000+ RPM bike would not be able to leave the starting gate with before it's clutch exploded!
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And when I say she ain't quick, that don't mean she ain't fast. Off the line is one thing, but at 90 MPH I'm pullin' about 4 grand and still got throttle left. If you figure I'm doing 55 at three grand, then I got about another 30-35 MPH at 5 grand. Never ran one of these puppies that quick. My pair ain't quite that big. But she's plenty fast as I will ever need.
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Many thing contribute to high RPM capability, the ratio of piston diameter to crankshaft stroke, the wieght of reciprocating parts, the balance of the reciprocating parks, the balance of the rotating parts, the wieght of rotating parts, the materials used, the type of valve train, this last one is very important because only one type of production valve train will acomedate 11,000-18,000 rpm redlines found on modern sport bikes. this system is called shim under bucket, which severly lightens the recirocating mass of the valve train, limiting the posibilty of floating valves, the primary cause of failure associated with high rpm, I've just scratched the surface here but hope it helps answer your question.More Questions & Answers ...
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