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Old 01-26-2014, 04:44 AM   #166
Albie
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Quote:
Originally Posted by DAKEZ View Post
Said the smart guy that takes the truck.

Fixed it for ya Buttercup.
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Old 01-26-2014, 04:51 AM   #167
tkent02
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Originally Posted by JohnCW View Post
Different for some small bore engine revving its head of going down the freeway.

Am I going with the flow here, or in the opposite direction????
No matter how high or how long you rev it, the heads don't actually come off.

They just run and run. Make a lot of power. Have nice gear spacing. Get good fuel economy. Last a long time.
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Old 01-26-2014, 07:21 AM   #168
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Originally Posted by tkent02 View Post
No matter how high or how long you rev it, the heads don't actually come off.

They just run and run. Make a lot of power. Have nice gear spacing. Get good fuel economy. Last a long time.
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.

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Old 01-26-2014, 07:52 AM   #169
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Piston speed is everything.
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Old 01-26-2014, 08:02 AM   #170
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Piston speed is everything.
Yeah, that is why oversquare is a thing.

I would wager my 675 turning 10,000 and a Harley 103 turning 3100 have about the same piston velocity.
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Show folks something with a clutch and carburetor, and it's like teaching a baboon to use a Macbook.
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Old 01-26-2014, 08:21 AM   #171
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piston speed is not quite everything,have to consider the weight of the reciprocating components when they change direction.
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Old 01-26-2014, 08:28 AM   #172
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Yes, container ship engines operate at about 100 RPM but with a stroke measured in feet, the piston speed is significant. BTW on all of them the lowest fuel consumption is at about 80% load. There are some low revs for you.

Roc
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Old 01-26-2014, 08:36 AM   #173
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Yes, container ship engines operate at about 100 RPM but with a stroke measured in feet, the piston speed is significant. BTW on all of them the lowest fuel consumption is at about 80% load. There are some low revs for you.

Roc
Well yeah when you can walk around in the crank gallery lol
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Show folks something with a clutch and carburetor, and it's like teaching a baboon to use a Macbook.
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Old 01-26-2014, 08:50 AM   #174
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Quote:
Originally Posted by ragtoplvr View Post
Yes, container ship engines operate at about 100 RPM but with a stroke measured in feet, the piston speed is significant. BTW on all of them the lowest fuel consumption is at about 80% load. There are some low revs for you.

Roc
Ahh but the real question arises. Is a container ship more aerodynamic then a freight train?
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Old 01-26-2014, 09:15 AM   #175
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Ahh but the real question arises. Is a container ship more aerodynamic then a freight train?
At 12 knots, who cares
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Old 01-26-2014, 11:08 AM   #176
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No, but the ships usually have a tailwind. Trade routes and such. Theres even ideas to attach retractable sails to them to further improve efficiency

Sent from my Tandy 1000 mobile using DOS
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Old 01-26-2014, 12:43 PM   #177
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Ahh but the real question arises. Is a container ship more aerodynamic then a freight train?

what's below water counts more, hull design has improved quite a bit

modern submarines can travel faster submerged
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Old 01-26-2014, 03:10 PM   #178
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what's below water counts more, hull design has improved quite a bit

modern submarines can travel faster submerged
They also have nuclear power plants.

......yet the carrier is the fastest ship in the fleet....all hundred,-thousand tons of it
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Old 01-26-2014, 04:00 PM   #179
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Uncomfortable? Dude, I can sleep on an airplane in coach for 8 hours straight and wake up refreshed. My Tundra is 10 times more comfortable then an airplane. And sleeping while I'm riding my motocycle is pretty damn dangerous.

There are no such thing as better, long lasting tires. There's either long lasting which is relative to who's riding on them as just an example I get about 2500 miles out of a Pilot Road 3 on a 55 HP V-Strom, or there's better.
If you are getting 2500 miles out of a set of PR3's on a V-strom, then YOU are completely doing it wrong; you have chosen the wrong tool for the job. You should stick with you Yamakazuki 1500 super sport show-mobile.

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Old 01-26-2014, 04:15 PM   #180
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Ahh but the real question arises. Is a container ship more aerodynamic then a freight train?
THAN, Muffinbutt. You're gonna wake Klay up.
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