 Reason for HP decrease with '07 model
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Joined: Apr 2007
Posts: 495
Adjunct
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OP
Adjunct
Joined: Apr 2007
Posts: 495 |
This has probably been discussed, but could someone briefly tell me why the '07 America lost HP with an increase in displacement? I found it interesting that it has better torque, but 7 less HP.
Pedal Till You Puke
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Re: Reason for HP decrease with '07 model
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Joined: Oct 2005
Posts: 3,463
Loquacious
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Loquacious
Joined: Oct 2005
Posts: 3,463 |
Because that's how it is. It's how it's been with the America and SM since always.
Gina
03 America - Pretty stock - except the TBS wheel... 
06 America - missing, presumed in bits. With it's TBS wheel... 
09 America - It's very blue....
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Re: Reason for HP decrease with '07 model
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Joined: Mar 2006
Posts: 84
Member
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Member
Joined: Mar 2006
Posts: 84 |
yes that's how it is. Good luck with your (Faster 07)
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Re: Reason for HP decrease with '07 model
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Joined: Jan 2005
Posts: 8,639 Likes: 3
Old Hand
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Old Hand
Joined: Jan 2005
Posts: 8,639 Likes: 3 |
It's an emissions thing. The valve timing is much milder on the '07, looks very similar to the pre-WW1 engines that redlined at 450 - 700 RPM. This is what happens when politicians fancy themselves to be engineers. Next thing you know, they will be mandating vacuum operated intake valves.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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Re: Reason for HP decrease with '07 model
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Joined: Jan 2005
Posts: 6,308 Likes: 4
Worn Saddle
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Worn Saddle
Joined: Jan 2005
Posts: 6,308 Likes: 4 |
It's cause of the new cams they use. You could put cams from an 03 in there and boost them back up a bit I would bet.
Hmmm, maybe I should sell mine to one of youz guyz?
A word to the wise is not necessary. It is the stupid ones who need the advice.
Pat
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Re: Reason for HP decrease with '07 model
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Joined: Apr 2007
Posts: 495
Adjunct
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OP
Adjunct
Joined: Apr 2007
Posts: 495 |
Quote:
yes that's how it is. Good luck with your (Faster 07)
Good luck selling your (slower '05) 
Pedal Till You Puke
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Re: Reason for HP decrease with '07 model
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Joined: Apr 2007
Posts: 495
Adjunct
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OP
Adjunct
Joined: Apr 2007
Posts: 495 |
Quote:
It's an emissions thing. The valve timing is much milder on the '07, looks very similar to the pre-WW1 engines that redlined at 450 - 700 RPM. This is what happens when politicians fancy themselves to be engineers. Next thing you know, they will be mandating vacuum operated intake valves.
Thanks for a "real" answer - sometimes it is difficult to get past the comedians to get a legitimate reply. I guess I'd rather have more torque than HP. I remember an old Harley Pan Head that I had. Crap HP, but good torque making it fun to come off the line.
Pedal Till You Puke
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Re: Reason for HP decrease with '07 model
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Joined: Mar 2006
Posts: 1,540
Learned Hand
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Learned Hand
Joined: Mar 2006
Posts: 1,540 |
Quote:
It's cause of the new cams they use. You could put cams from an 03 in there and boost them back up a bit I would bet.
Hmmm, maybe I should sell mine to one of youz guyz?
So is this a answer to the can I run 790 cams in an 856 question.
And what about the thrux cams in the 865 SM/BA?
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Re: Reason for HP decrease with '07 model
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Joined: Mar 2007
Posts: 151
Adjunct
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Adjunct
Joined: Mar 2007
Posts: 151 |
Politicians are treating bikes like cars.
They don't consider a bike is faster in the city and don't stop long in queues to trafic lights, and needs less time for the same trip, so less carburant and less pollution.
They are reducing bikes to have the same power of an equivalent displacement car.
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Re: Reason for HP decrease with '07 model
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Joined: Jan 2005
Posts: 6,821
Bar Shake
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Bar Shake
Joined: Jan 2005
Posts: 6,821 |
Just an interesting fact to help with understanding the whole torque HP relationship: "At 5252 rpm, horsepower is equal to torque. This is always true. If your dyno tells you that the horsepower and torque curves cross anywhere other than 5252 rpm, your dyno is broken." I pasted that from this site: horsepower, torque etc. Someone had posted this link before. It's an interesting read if you're into that.
Contra todo mal, mezcal; contra todo bien, también
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Re: Reason for HP decrease with '07 model
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
Quote:
Politicians are treating bikes like cars.
They don't consider a bike is faster in the city and don't stop long in queues to trafic lights, and needs less time for the same trip, so less carburant and less pollution.
They are reducing bikes to have the same power of an equivalent displacement car.
True in Europe, not as much in the states. Lane splitting isn't as common a practice here, so it's not as benificial to the gas milage.
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Reason for HP decrease with '07 model
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Joined: Jun 2006
Posts: 2,626
Loquacious
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Loquacious
Joined: Jun 2006
Posts: 2,626 |
And what about the thrux cams in the 865 SM/BA?
The Thruxton engine uses a 360 degree crank. The cams won't work.
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."
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