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 Post subject: exhaust pipes
PostPosted: Tue Apr 25, 2017 9:41 pm 
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Adventure Rider
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Joined: Mon Feb 06, 2012 11:47 pm
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Location: Valemount B.C.
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For those interested in comparing a Power Bomb SS exhaust header pipe to the stock system here is a few photos taken before installation. https://photos.google.com/share/AF1QipO ... JzUU1VWWN3


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 Post subject: Re: exhaust pipes
PostPosted: Tue Apr 25, 2017 11:16 pm 
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Joined: Mon Apr 25, 2016 7:56 am
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other than pretty! what are the performance differences?


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 Post subject: Re: exhaust pipes
PostPosted: Wed Apr 26, 2017 12:54 am 
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we'll find out.I am hoping to get a bit more top end power so the engine pulls hard all the way up when passing on the highway.


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 Post subject: Re: exhaust pipes
PostPosted: Wed Apr 26, 2017 5:51 am 
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Joined: Mon Aug 11, 2014 5:12 pm
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Location: South Central PA
xlcc wrote:
we'll find out.I am hoping to get a bit more top end power so the engine pulls hard all the way up when passing on the highway.


Don't get excited if you finding are different from your hopes. You're only working with so much peak HP. Moving 1 or 2 of those to the upper range isn't going to have a big effect.


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 Post subject: Re: exhaust pipes
PostPosted: Wed Apr 26, 2017 2:19 pm 
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xlcc wrote:
we'll find out.I am hoping to get a bit more top end power so the engine pulls hard all the way up when passing on the highway.
You should get exactly what you are looking for.
Here's the dyno comparison PowerBomb is the orange line.

Image

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 Post subject: Re: exhaust pipes
PostPosted: Wed Apr 26, 2017 3:24 pm 
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ProCycle wrote:
xlcc wrote:
we'll find out.I am hoping to get a bit more top end power so the engine pulls hard all the way up when passing on the highway.
You should get exactly what you are looking for.
Here's the dyno comparison PowerBomb is the orange line.

Image


If the blue line is really a totally stock DR650 I'd bet grinding the header weld would provide very similar results in netting what look like a 1 HP gain.


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 Post subject: Re: exhaust pipes
PostPosted: Wed Apr 26, 2017 9:42 pm 
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Adventure Rider
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I fitted the header pipe to the engine and cut about an inch off the end to not go so deep by the rear brake line.Next I went to my box of old Harley pipes and fabbed up a configuration that met my muffler.https://photos.google.com/share/AF1QipO ... JzUU1VWWN3


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 Post subject: Re: exhaust pipes
PostPosted: Wed Apr 26, 2017 11:11 pm 
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PerazziMx14 wrote:
If the blue line is really a totally stock DR650 I'd bet grinding the header weld would provide very similar results in netting what look like a 1 HP gain.
[/quote]
Don't look at it as 1hp gain in peak Hp. Instead look at it as a percent. Roughly 5% more HP at 6000 RPM and 11% more at 6700. If you are passing a truck on a hill that's where you're going to be using the motor.

The important thing to note when looking at dyno charts is 'area under the curve'. Comparing peak numbers doesn't mean much. 'xlcc' is looking for more usable top end power and the head pipe is one way to get it.

Another way to look at it is the motor with pipe makes the same or more power from 5200 to 6300 as the stock pipe motor made at its peak. The headpipe motor gets there earlier and makes more power longer.

My dyno never showed any detectable difference from grinding the headed weld.
Some welds are worse on some bikes so it could possibly make a difference if the weld is especially bad.

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 Post subject: Re: exhaust pipes
PostPosted: Thu Apr 27, 2017 12:19 am 
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Adventure Rider
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Joined: Thu Aug 15, 2013 9:58 am
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ProCycle wrote:
My dyno never showed any detectable difference from grinding the headed weld.
Some welds are worse on some bikes so it could possibly make a difference if the weld is especially bad.

This statement doesn't surprise me. Good flow is often about smooth transitions, etc.
The original pipe was included in the box of parts that came with my bike. The weld is good, very smooth and not very proud of the pipe at all.
I looked at it a while ago and concluded that any flow increase due to increase in diameter from grinding the weld would probably be negated by the rough surface of the grinding introducing turbulence.

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 Post subject: Re: exhaust pipes
PostPosted: Thu Apr 27, 2017 12:55 am 
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There's also the fact that what may look like an ugly, blobby weld doesn't actually protrude beyond the edge of the exhaust port.

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