scorpion exhaust pressure

i have a 2008 Fz6R.
the exhaust pressure from my left muffler is alot higher than my right muffler. is that normal for the scorpion exhaust ?

thanks in advance.
Sonny

I can't answer specific to your model as different manufactures obtain different results. The slip-on themselves are nearly restriction free. This leaves the Y pipe and any diverter installed to balance the flow.

On most after market cans, the right side typically flows more volume as its virtually a straight shot from the mid-pipe out the right side.
In addition; the bikes under tail OEM design leaves little space to divide the Y pipe equally for flow to both sides. So manufactures can employ discs and minor restrictions to balance the flow.

Lets see what others have to say. I'm running Two brothers and the right side flows just slightly more at low RPMs. Not sure about higher RPMs and under load.

FinalImpact said:

So manufactures can employ discs and minor restrictions to balance the flow.

Click to expand...

just by looking, i see a restriction disk in the right Y pipe. i wonder if its part of the Y pipe or if the previous owner put it in. can anyone using after market exhausts let me know if you have that restriction visible at the Y pipe ?

thanks

Does it look like this:

In my open Scorpions (checked it today), the pressure seems about even however the exhaust is definitly hotter on the left side. I suppose the elbow heats up a bit and transfers it..

Now, looking down both pipes, there are NO restrictor plates, period.

It does appear that in the "Y pipe, right before the muffler would bolt up, you can see the hole machined on the "Y" pipe. IE, just prior to welding the Y together, they didn't open that RS hole fully (I suppose to even out the flow some).

The opening in the RS of the "Y" pipe is probably 2/3 to 3/4 the size of the left (which flows straight thru the bend in the "Y" pipe), no restrictions...

Perhaps for Canada, they did something different, ...

Seems like mine on our fz6 was the same way. And as there is minimal restriction to the other side I didn't bother to do anything. But the mentioning to even the flow makes good sense!

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TownsendsFJR1300 said:

The opening in the RS of the "Y" pipe is probably 2/3 to 3/4 the size of the left (which flows straight thru the bend in the "Y" pipe), no restrictions...

Perhaps for Canada, they did something different, ...

Click to expand...

it appears to be less than 2/3. maybe i'm making a fuss over this.. .i'll check when i take the muffler off. but i think i'll make the hole abit larger to 2/3 to 3/4. but i'll wait till the snow melts ..

thanks everyone !
Sonny

oh... i got the bike from someone in NY.

sonny said:

it appears to be less than 2/3. maybe i'm making a fuss over this.. .i'll check when i take the muffler off. but i think i'll make the hole abit larger to 2/3 to 3/4. but i'll wait till the snow melts ..

thanks everyone !
Sonny

oh... i got the bike from someone in NY.

Click to expand...

That's about how mine is.

IMO, unless someone modified it, I'd leave it. I'm sure the engineers could have made it larger if need be... :thumbup:

TownsendsFJR1300 said:

I'm sure the engineers could have made it larger if need be... :thumbup:

Click to expand...

yes, you're right. i'm just making work for myself. i'll just leave it alone.

thanks !

sonny said:

it appears to be less than 2/3. maybe i'm making a fuss over this.. .i'll check when i take the muffler off. but i think i'll make the hole abit larger to 2/3 to 3/4. but i'll wait till the snow melts ..

thanks everyone !
Sonny

oh... i got the bike from someone in NY.

Click to expand...

Exactly how my Scorps are. I have uneven flow, heat, etc as well.

Ride on, my friend.


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In terms of area and flow, the 90° upshot from under the bike has to be the worst. I'm guessing its smaller inside and hurts the flow more with that sharp bend than anything downstream of it. IIRC the cat pipe was 1.65" ID.

On my 2 bro, the Y pipe did not drop in is size anywhere so effectively, one can on the right side and I'd be set! Just looking kinda funny! Blah

FinalImpact said:

In terms of area and flow, the 90° upshot from under the bike has to be the worst. I'm guessing its smaller inside and hurts the flow more with that sharp bend than anything downstream of it. IIRC the cat pipe was 1.65" ID.

On my 2 bro, the Y pipe did not drop in is size anywhere so effectively, one can on the right side and I'd be set! Just looking kinda funny! Blah

Click to expand...

Actually, there's two parts that make up the "Y" pipe on the Scorp.

The main part is formed and welded (no accordian kinks in the pipe), same large ID/OD, then to the left side is a 90 degree pre-bent pipe (again same ID/OD), as wide a sweep as you can to get the mufflers positioned as designed) which is welded to that other "Y" piece (appears to MIG welded).

Yes its 90 degrees, but the pipe is large and smooth. I suspect thats why they decided on a slightly smaller hole drilled bleeding to the "straight thru" right muffler..