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Old 12-17-2012, 07:45 AM   #1
grsa
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When things feel right-your bikes sweet spot

Riding in this morning I realized the following
My bike seems to run best in this temp range -64-75
Feels the smoothest between 80-85mph
Wish we had more of these days.

Whats your bikes sweet spot?

Temp?
MPH?
Other?
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Old 12-17-2012, 08:18 AM   #2
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Engines usually run better in cooler weather due to the air being denser so volumetric efficiency improves. Mine runs a little better now as well, but something else ive noticed is the front suspension absorbs bumps better, something to do with fork oil viscosity im sure.
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Old 12-17-2012, 08:21 AM   #3
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Old 12-17-2012, 08:34 AM   #4
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Old 12-17-2012, 10:24 AM   #5
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My bike runs very good below 160f, feels a bit more responsive across the rpm range.
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Old 12-17-2012, 11:41 AM   #6
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Quote:
Originally Posted by hotcknstrips View Post
Engines usually run better in cooler weather due to the air being denser so volumetric efficiency improves. Mine runs a little better now as well, but something else ive noticed is the front suspension absorbs bumps better, something to do with fork oil viscosity im sure.
Technically speaking it does, but the power gain is mostly just from having more air molecules to mix with more fuel to produce more power per stroke. The volumetric efficiency doesn't actualy increase. VE relates mostly to intake air velocity. higher velocity helps the engine work as an air pump (which is really what an IC engine is) thus increasing VE. Too high a velocity, though, means the intake track may be too restructive and frictional losses rise. This is why high performace and race engines have very large bore throttle bodies for best VE at upper ROM range. Down side is at part throttle, air velocity is low and so VE is poor. That's why race engines typically idle like shiite.

Think of it another way, when the relative humidity is high and the air is full of moisture, the partial pressure from water vapor displaces air molecules, so the engine makes less power per stroke. Volumetric efficiency stays the same, since there is no change to intake air velocity.

Sorry for geeking out.
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Old 12-17-2012, 11:44 AM   #7
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Mine is best around 135 MPH and 65 degrees.
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Old 12-17-2012, 11:46 AM   #8
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Old 12-17-2012, 01:22 PM   #9
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Temp: 65-85 (Anything colder, the open carb's make the bike a to start, Any hotter I'm worried about burning the engine up haha.

MPH: 60-90

To clarify, the bike cruises fine between any of those speeds, but where she really comes alive is 4th and 5th gear at 5K-8K RPM's that's the point that the speedometer is out running the tachometer by mile
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Old 12-17-2012, 01:34 PM   #10
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My KTM loves the cooler weather! More frisky when the outside temp is 60-70. 80-90 miles and hour at around 5K RMP's seems to be the bike's happy spot. I'm sure the fact that the bike is European and a twin plays a part in it.
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Old 12-17-2012, 05:06 PM   #11
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The V7R loves 80 MPH, fifth gear, and 5000 rpm on a 70F day, nice and dry....but I like twisties and wish there were more around Houston.
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Old 12-17-2012, 07:25 PM   #12
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Quote:
Originally Posted by Volfy View Post
Technically speaking it does, but the power gain is mostly just from having more air molecules to mix with more fuel to produce more power per stroke. The volumetric efficiency doesn't actualy increase. VE relates mostly to intake air velocity. higher velocity helps the engine work as an air pump (which is really what an IC engine is) thus increasing VE. Too high a velocity, though, means the intake track may be too restructive and frictional losses rise. This is why high performace and race engines have very large bore throttle bodies for best VE at upper ROM range. Down side is at part throttle, air velocity is low and so VE is poor. That's why race engines typically idle like shiite.

Think of it another way, when the relative humidity is high and the air is full of moisture, the partial pressure from water vapor displaces air molecules, so the engine makes less power per stroke. Volumetric efficiency stays the same, since there is no change to intake air velocity.

Sorry for geeking out.
Thats some good info right there.
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Old 12-18-2012, 03:01 AM   #13
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Quote:
Originally Posted by Volfy View Post
Technically speaking it does, but the power gain is mostly just from having more air molecules to mix with more fuel to produce more power per stroke. The volumetric efficiency doesn't actualy increase. VE relates mostly to intake air velocity. higher velocity helps the engine work as an air pump (which is really what an IC engine is) thus increasing VE. Too high a velocity, though, means the intake track may be too restructive and frictional losses rise. This is why high performace and race engines have very large bore throttle bodies for best VE at upper ROM range. Down side is at part throttle, air velocity is low and so VE is poor. That's why race engines typically idle like shiite.

Think of it another way, when the relative humidity is high and the air is full of moisture, the partial pressure from water vapor displaces air molecules, so the engine makes less power per stroke. Volumetric efficiency stays the same, since there is no change to intake air velocity.

Sorry for geeking out.

........what you say about my momma?!?
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Old 12-18-2012, 07:41 AM   #14
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I know what u mean. My bike runs and feels smooth all over. But I love 130 - 150. It's quiet and glides.
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Old 12-18-2012, 08:17 AM   #15
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V7R also likes third gear, 6000 RPM and 60 MPH on a warm day...through broad sweeping corners on way to Brazos Bend Park.
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Old 12-18-2012, 08:20 AM   #16
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Outside temps, 60-75
motor temp 165-190
Mph 75-90mph
5th or 6th gear 6500-9000rpms

bike runs like a beast at any of those specs.
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Old 12-18-2012, 09:38 AM   #17
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All my bikes run best at ~ 11:30 on the wheelie clock.
I love riding in the cooler weather.
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