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Old 10-26-2012, 04:40 AM   #17596
Tripped1
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Quote:
Originally Posted by UnsureFooting View Post
I looked em up, like you asked. They're flat for sport bikes, but not nearly as flat as a sportster or a vstar 1100.

Can you really tell a 10ft/lbs difference across 7,000RPM? Particularly on the ZX-14 and Busa where you have over 100ft/lbs on tap.

...but for the 1050 http://www.google.com/imgres?q=Tiger...98&tx=77&ty=51

That is prerty farking flat lol
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Old 10-26-2012, 04:42 AM   #17597
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And that torque curve you showed me isn't all that flat. There's a 40 ft-lb difference between those lines. The graphic is being squashed by the scaling.
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Old 10-26-2012, 04:43 AM   #17598
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Uh-huh. I know. Low rpm is definitely not 4k. If you have to wait until 4k for power, that's not a low rpm engine. The big twins are excellent for riding in situations that require lots of speed changes, because you don't have to shift constantly to stay in the power band. They're not road racing super stars, no. They're for practical riding at a practical pace.

When 4,000 is less then a 1/3 of you tach it certainly is.

...and I just showed dynos for THREE bikes that you don't have to shift much at all. Even on "peaky" bikes like an R6 you run the bike at 9,000-10,000 and pick the gear for the road you are on and you don't have to shift bloody much. That R6 has a 17,600rpm redline.

Like I said its a matter of extreme.

Four grand is a lot if you can only turn 5,500, its nothing if your redline is 5 figures. On my 675 I rarely come out of 2nd gear below highway speeds, and I mean interstate highway speeds.
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Old 10-26-2012, 05:03 AM   #17599
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Originally Posted by UnsureFooting View Post
If you don't believe long stroke twins have a flatter torque curve than short stroke fours, you don't know much about engines.
Short stroke engines have two huge advantages over long stroke ones. Tripped1 has already identified one of them. The other is that larger valve sizes are possible.

The only advantage a long stroker has is narrowness.
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Old 10-26-2012, 05:05 AM   #17600
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There's a difference between low rpm engines (which is what I said) and low rpm for a particular engine. Bash away all you want on the long stroke twins, it just makes you look like an idiot.
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Old 10-26-2012, 05:12 AM   #17601
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Bash away all you want on the long stroke twins, it just makes you look like an idiot.
Long stroke engines must be respected, they won World War 1 for us.
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Old 10-26-2012, 05:19 AM   #17602
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Long stroke engines must be respected, they won World War 1 for us.
They have a place. Not everybody wants zip around at 6k rpm.
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Old 10-26-2012, 05:28 AM   #17603
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I prefer long strokes over short strokes ....
















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Old 10-26-2012, 05:29 AM   #17604
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Clearly, you have never been in a long line of Harleys...
I usually pass em!!!



On my Harley
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Old 10-26-2012, 05:33 AM   #17605
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But the important question is, what is the airspeed velocity of an unladen swallow?

Ah yes, pictures--

Old pfarts with attitudes:



Apropos, no?

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Old 10-26-2012, 05:38 AM   #17606
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Originally Posted by Tripped1 View Post
divided by 5250 ...but yes.
Power = torque x rpm

Horsepower = torque x rpm / 5252.
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Old 10-26-2012, 06:26 AM   #17607
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Quote:
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Power = torque x rpm

Horsepower = torque x rpm / 5252.
Fair enough.
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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 10-26-2012, 06:29 AM   #17608
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Quote:
Originally Posted by UnsureFooting View Post
They have a place. Not everybody wants zip around at 6k rpm.

If 6000 is the speed limit its not zipping now is it?

Quote:
Originally Posted by UnsureFooting View Post
There's a difference between low rpm engines (which is what I said) and low rpm for a particular engine. Bash away all you want on the long stroke twins, it just makes you look like an idiot.
......and where did I bash anything. I stated that long strokes tear themselves apart at high rpm regardless of configuration YOU are the one inferring that I have an issue with this.

The reason that I don't like Harleys is the air cooling, I don't like airheads. That 1050 I noted is a pretty long stroke for a sport application.
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Show folks something with a clutch and carburetor, and it's like teaching a baboon to use a Macbook.

Tripped1 screwed with this post 10-26-2012 at 06:34 AM
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Old 10-26-2012, 06:33 AM   #17609
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Quote:
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If 6000 is the speed limit its not zipping now is it?
Sure it is. I wasn't talking about the speed as much as the character of the motor.
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Old 10-26-2012, 06:36 AM   #17610
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Originally Posted by UnsureFooting View Post
Sure it is. I wasn't talking about the speed as much as the character of the motor.
Less than half of the tach, same as a big twin going 2000.

Zinging is 10 grand, now you are going somewhere.
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