Intake tract length

Steve Northrop blackgpz at
Sun Jan 27 15:16:30 PST 2008

I think you already summed it up......

>>and my butt is not that sensitive

Steve in Western NY
'96 GPZ1100
'02 Daytona 955i
'08 KLR 650
"You Can't Fix Stupid", Ron White

----- Original Message ----- 
From: "Andrew Smith" <asmith285 at>
To: "GPZ LIST" <gpzlist at>
Sent: Sunday, January 27, 2008 3:47 PM
Subject: Intake tract length

> Hello,
> I've got an idea I'd like to bounce off of the group.  Like many, I have
> switched to individual pod air filters.  Not necessarily for top end
> performance, but for ease of maintenance as much as anything.
> I know that theoretically the pod filters should reduce the intake tract
> length and have some detrimental effect on low end power (which may be
> masked by gains from reduced resistance through the K&N - I don't have 
> dyno
> pulls before and after and my butt is not that sensitive!).  After reading
> all about the new Yamaha's taking the time and resources to develop 
> variable
> intake tract lengths for the R1 and R6, I starting thinking about putting
> spacers between my carbs and pods to lengthen the tract length and gain 
> some
> low end power (though probably at the expense of high RMP breathing).
> I've gathered the materials to do so, but now I am uncertain of how long 
> to
> make them!  I'll probably start long and shorten them if I have need/time 
> to
> experiment.  I thought I'd throw these two questions out there for
> discussion:
> 1.  Is this (cheap) experiment worthwhile?
> 2.  How long should the spacer be?
> The more input the better!
> Thanks,
> Andy 

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