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Sportster Motorcycle - Bottom End Cams, Cases, Gears, Flywheel, Piston Conecting Rods, Oil Pump, etc...

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  #21  
Old 8th December 2010
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The charts are interesting, and I'd agree that most cruising on normal roads is done at around 3000rpm, but if the system only records periods of more than 30 seconds spent in a given rev range it's of limited use in choosing cams. Whilst accelerating through the gears, I'd suggest one would rarely spend 30 seconds or more within any given 500rpm rev range until one is up to cruising speed.
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  #22  
Old 8th December 2010
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I like my N4 cams[/QUOTE]

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  #23  
Old 8th December 2010
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Quote:
Originally Posted by Sporty 48 View Post
N4 is what I was thinking too. However I saw a dyno graph of the N2 vs N4 cams on the same bike. The chart overlay looked like mirror images(opposites) up to peak HP and Torque. The N4 was on top above 4250 or so rpm and the N2 was on top below that engine speed. http://www.sportster.org/wp-content/...10/N2vsN41.jpg
I was thinking it sure would be nice to get variable valve timing to get both N2 low rpm power and N4 upper rpm torque.
I guess it all depends upon where your engine spends most of it's useful life.
48,
With the right pipe you could make more power everywhere with the N4's.
That chart is as old as the hills! You stock sporty would make more power than that!
Lot'a peep's will say they don't spend lots of time in the upper rpm's and cant justify hot cams.
Whatever, It's only 'cause they don't have the power there now. Stock cams full flat at 5K
Get it? When your bike pulls hard to 6000 or 7000 rpms you don't fell like shifting at 4-5K!
The more top end power you got, the more time your gonna spend there.
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  #24  
Old 2nd January 2011
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how do you get this data ? thanks
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  #25  
Old 2nd January 2011
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Quote:
Originally Posted by J_68 View Post
how do you get this data ? thanks
It came off the after-market TC88A ignition unit I had on my Sporty. You can do something similar with the TTS and SEPST EFI programming systems.
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  #26  
Old 2nd January 2011
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I suspect my chart would be a little different. Mine would sit in the 4000 range. I don't like my n8 cams but they were cheap. I prefered my bike with the 536's. I suppose I will eventually buy a set of 536's again.
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  #27  
Old 4th January 2014
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That's more of a personality test than a cam choosing tool.
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  #28  
Old 4th January 2014
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Quote:
Originally Posted by jimmydee View Post
That's more of a personality test than a cam choosing tool.
Yes, key is that power is there for when it is wanted.
If 3 Tuesdays from next Wednesday you want to go full screech, so be it.
If riding like a saint will impress a sweet young cop, easy does it.
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  #29  
Old 5th January 2014
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the thread is from 2009. I am sure he probably has a much more balanced opinion 5 years later.
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Old 5th January 2014
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Quote:
Originally Posted by rottenralph View Post
the thread is from 2009. I am sure he probably has a much more balanced opinion 5 years later.
Five years? Wow, how time flies.

Not had the Sporty for a bit now but I'm still picking cams that put the power where I use it rather than because they make peak power at some stupid RPMs that I hardly ever use.
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