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Old 01-26-2014, 06:24 PM   #181
Albie
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Originally Posted by Kommando View Post
THAN, Muffinbutt. You're gonna wake Klay up.
Motolab, is that you?
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Old 01-26-2014, 06:36 PM   #182
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Motolab, is that you?
No shit. Sometimes I have to double check to see if I accidentally logged on to librarians.com.
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Old 01-27-2014, 07:34 AM   #183
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You're correct that "No matter how high or how long you rev it, the heads don't actually come off". You'll most likely drop a valve which will punch a hole in the top of the piston. That, or throw a rod, are the most common cause of engine failures you'll see on a race track.

They don't just run and run. In fact high-revving motorcycle engines have quite a short life before compression and performance start to drop. The high-revving is hard on rings and bores and as wear is gradual it goes unnoticed. The bike will still run, but nowhere like it did when new. The harder you ride it, the shorted the time till performance starts to deteriorate. About 50 thousand kilometers and a bike is ready for a top end rebuild. A petrol car engine 300,000?, a diesel 500,000+?

A race engine may be rebuilt after every outing, that's how much toll a hard life takes on an engine.

F.W.I.W. I thought we were talking about street bikes here?

Please don't tell my little 250 that has almost 25,000 high revving miles on it (and is air cooled) that it's supposed to be burning as much oil as one widely popular 650CC liquid cooled thumper does with 1/2 the mileage.

Almost any street engine that's worth 1/2 it's weight in design, is designed to operate reliably when kept out of redline regardless of sustained RPM's. (regardless of CC's too!)
I say "almost any" above, to exclude some piss poor designs and expensive Euro bikes that have a penchant for dropping valves...because I don't want to start a riot and get banned again. (I no longer name names; I guess getting banned taught me something after all)
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Old 01-27-2014, 08:47 AM   #184
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My little dual sport Lifan 200 (Chinese) is air cooled, runs at high RPM, and is just about to turn over 50,000 miles, not kilometers, miles. The engine has never been opened up and it doesn't burn any oil. Not sure what that proves except that even the Chinese can build a bike that runs 8,000 RPM on the highway and not quickly wear out.
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Old 01-27-2014, 12:50 PM   #185
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My little dual sport Lifan 200 (Chinese) is air cooled, runs at high RPM, and is just about to turn over 50,000 miles, not kilometers, miles. The engine has never been opened up and it doesn't burn any oil. Not sure what that proves except that even the Chinese can build a bike that runs 8,000 RPM on the highway and not quickly wear out.

I don't think it will matter how much empirical information those of us with small CC bikes offer up around here, many still want to believe myth-information because it makes them better able to justify their behemoth cock extensions.

I also worked with a guy who had a Lifan D.S. and it was solid as a rock even @ almost 30,000 miles as well.
Had he believed the opinions around this place, he'd have lost out on being able to buy into his first new D.S. due to a lack of affordability in the mainstream.
Congratulations for not being a sheeple!
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Old 01-27-2014, 02:17 PM   #186
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By your logic jet engines would only run a mile or two before grinding.
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Old 01-27-2014, 02:28 PM   #187
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By your logic jet engines would only run a mile or two before grinding.
....He'll just tell you they rebuild them every flight.
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Old 01-27-2014, 02:39 PM   #188
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By your logic jet engines would only run a mile or two before grinding.
jet engines don't gave pistons reversing speed
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Old 01-27-2014, 02:47 PM   #189
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jet engines don't gave pistons reversing speed...or else they'd have to rebuild them every flight
= gottsta have fun where you can. L.O.L.! (I'm being light-hearted and mean no offense)
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Old 01-27-2014, 04:27 PM   #190
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Fun fact: Say you feel like flying into a volcanic dust cloud because you're a psychopath. An internal combustion engine will almost immediately stall. A jet engine can operate for an extended period of time in the same environment. So next time you want to go all kamakaze on Mount St. Helens, fly Southwest Airlines.
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Old 01-27-2014, 05:55 PM   #191
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Fun fact: Say you feel like flying into a volcanic dust cloud because you're a psychopath. An internal combustion engine will almost immediately stall. A jet engine can operate for an extended period of time in the same environment. So next time you want to go all kamakaze on Mount St. Helens, fly Southwest Airlines.
...but...but...if there's a treadmill in the dustcloud you're SOOOO screwed!


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Old 01-27-2014, 08:54 PM   #192
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jet engines don't gave pistons reversing speed
And there is no stress on the vanes of either the Hp turbine, or LP turbine in any of the THREE planes of force while spinning at 10,000 to 24,000 rpm.

Really? Just really?
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Old 01-27-2014, 08:59 PM   #193
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A jet engine can operate for an extended period of time in the same environment.
That's not what they teach us about operating jet engines in volcanic ash. They say get the fuck out of it as fast as you can, while closing the throttles and using all the bleed air you can even though that will trash all of the air systems on the airplane.
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Old 01-27-2014, 09:13 PM   #194
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And there is no stress on the vanes of either the Hp turbine, or LP turbine in any of the THREE planes of force while spinning at 10,000 to 24,000 rpm.

Really? Just really?

Pistons are stressed on THREE planes of force as well. The difference being the piston is protected from the cylinder walls by a very thin film of oil. The higher the piston speed, the more often the piston breaks through the oil film and receives wear. Turbine blades do not have any regular friction contact surfaces, other than the odd grain of dust/sand and bird ingestion. As long as those are avoided, blades are happy (not getting into heat induced stress fractures).
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Old 01-27-2014, 09:22 PM   #195
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When I rode a bike almost exclusively commuting, I initially had an FZ6. It was a great bike, but was geared low and loved to rev on the highway. I have no doubt that engine would last forever running 75mph and about 7,000 rpm's, but it wore me out.

I switched to a bandit 1200 with three teeth lower on the rear sprocket (the PO did that) and it would hum along at about 3500 rpm's on the freeway. I don't know if it was the difference in noise, vibrations, or weight (stability), but the Bandit was a whole lot more pleasant on any ride longer than 10 miles.
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