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  #1  
Old 30th May 2009
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Default A picture that justifies my cam choice



This is data on the last 3-1/2 hours of riding my bike. Its been a mix; with some sharp acceleration, some street cruising, some highway cruising and some 100mph+ pulls.

You can see that most of the riding takes place at 2000-3000rpm with hardly anything above 5000rpm. So I'd say my choice of Andrews N3 cams was pretty much spot on. If I had chosen some 'hotter' cams that pushed the power to 5000+rpm then I would have put the power just where I least needed it.

I'd say this is pretty typical for a lot of riders and good evidence against over-camming.
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Old 30th May 2009
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I have to agree with your findings, Fox...

This looks like a classic street bike pattern...
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Old 30th May 2009
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Exceptionally relevant information for folks considering cam choices..

I've stuck this, for future reference..

Thanx!
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Old 30th May 2009
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Quote:
Originally Posted by FoxsterUK View Post
If I had chosen some 'hotter' cams that pushed the power to 5000+rpm then I would have put the power just where I least needed it.
With hotter cams, would you simply spend more time in the upper RPM range because that's where the power would be?

I think we humans adapt somewhat to the machines we use...........
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Old 31st May 2009
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Nice!!! Definitely good info. Have to try this with my ignition.
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Old 31st May 2009
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I also have the N3's. Very happy with my chioce.
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Old 31st May 2009
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For referrence, this is my chart from over 120 hours of operating time.

I think there is some useful info here, although I have to question the validity of some of it, since in the last 120 hours, I'm sure I've hit the rev limiter several times (set at 6250 - 6300) and never have I hit 7468 RPM. Plus, how can I have .39 seconds at the RPM limit yet have no time recorded from 5000 - 6500 RPM?

I'm running stock W cams. I'm wondering if so much of my time above 2999 RPM has anything to do with the reversion of my 2:1 pipe and me riding around it.

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Old 31st May 2009
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Quote:
Originally Posted by Lenster View Post
For referrence, this is my chart from over 120 hours of operating time.

I think there is some useful info here, although I have to question the validity of some of it, since in the last 120 hours, I'm sure I've hit the rev limiter several times (set at 6250 - 6300) and never have I hit 7468 RPM. Plus, how can I have .39 seconds at the RPM limit yet have no time recorded from 5000 - 6500 RPM?

I'm running stock W cams. I'm wondering if so much of my time above 2999 RPM has anything to do with the reversion of my 2:1 pipe and me riding around it.

allso running a 2-1 and i ride at 3000+rpm most of the time,80mph is 3900-4000rpm for me though,only in the first 3 gears do i even try to ride under 3000rpm,1 and 2 gear are good for puttin around between 2000 and 3000
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Old 1st June 2009
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Quote:
Originally Posted by Lenster View Post
I think there is some useful info here, although I have to question the validity of some of it, since in the last 120 hours, I'm sure I've hit the rev limiter several times (set at 6250 - 6300) and never have I hit 7468 RPM. Plus, how can I have .39 seconds at the RPM limit yet have no time recorded from 5000 - 6500 RPM?
Elapsed time data in any given RPM range is only logged if you run for at least 30 seconds in that range. Thus if every time you start the bike, you only run for a total of 20-25 seconds in the higher RPM ranges, the value shows as zero.

I'm also showing 7468 Maximum engine revs, My limiter is set at 6000rpm and always has been...
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Old 1st June 2009
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Quote:
Originally Posted by Gojira View Post
allso running a 2-1 and i ride at 3000+rpm most of the time,80mph is 3900-4000rpm for me though,only in the first 3 gears do i even try to ride under 3000rpm,1 and 2 gear are good for puttin around between 2000 and 3000
That pretty much sums up how I ride as well, With "Hotter" cams the engine revs up so fast your flat out changing all the time

Quote:
Originally Posted by Lenster View Post
With hotter cams, would you simply spend more time in the upper RPM range because that's where the power would be?

I think we humans adapt somewhat to the machines we use...........
What the chart doesn't show are the times your getting on it. Like taking off from a stop light, taking it to the redline in every gear. We're not spending enough time in the higher revs before changing gear for it to be logged in the statistics. What its showing are the times were cruising at a somewhat steady throttle position
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