Exhaust temperature differencial

[darkember]

After doing my additional power supplies I ran the bike up to top temperature to check the fan kick in at 101 degrees all working well. What I did notice as you stand behind the bike the exhaust temp from the right can was markedly cooler than that from the left can. Could someone explain the reason for this difference and why so.

[Watty]

Ti's normal , its how the headers are baffled inside I believe. A Storm boffin will be along with an in depth explanation shortly

[8541Hawk]

This is normal and the reason is the "obstruction" that folks talk about in the exhaust header.

What is going on is at low RPM the exhaust is mainly routed to the left can.
This make the exhaust system "appear" longer, which gives more power down low.

As the RPMs rise so does the pressure inside the system.
This routes more gas to the right hand can, which then makes the system "appear" shorter, which is needed for high RPM power.

So because the system acts like a "variable" length system (with no moving parts.... tricky little Japanese engineers....lol ) you get the uneven heating of the cans at low RPMs.

Run it up high for a little bit and both cans will be the same temp

[lloydie]

Because the headers favour the left side and the right side is for scavenging



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[Watty]

Ti's normal , its how the headers are baffled inside I believe. A Storm boffin will be along with an in depth explanation shortly

Told ya

[darkember]

Good explanations thanks hawk and Lloydie

[Watty]

Good explanations thanks hawk and Lloydie

You're welcome for my input

[8541Hawk]

Ti's normal , its how the headers are baffled inside I believe. A Storm boffin will be along with an in depth explanation shortly

Told ya

It's a tough job but somebody has to do it......

[Watty]

Ti's normal , its how the headers are baffled inside I believe. A Storm boffin will be along with an in depth explanation shortly

Told ya

It's a tough job but somebody has to do it......

I was basically correct for once though

[Salty Dog]

So what happens when you drill out the header obstruction at the Y joint where the Right side can mounts?

[lloydie]

So what happens when you drill out the header obstruction at the Y joint where the Right side can mounts?

You feck it up .


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[sirch345]

This is normal and the reason is the "obstruction" that folks talk about in the exhaust header.

What is going on is at low RPM the exhaust is mainly routed to the left can.
This make the exhaust system "appear" longer, which gives more power down low.

As the RPMs rise so does the pressure inside the system.
This routes more gas to the right hand can, which then makes the system "appear" shorter, which is needed for high RPM power.

So because the system acts like a "variable" length system (with no moving parts.... tricky little Japanese engineers....lol ) you get the uneven heating of the cans at low RPMs.

Run it up high for a little bit and both cans will be the same temp

I'm impressed Mike, very good explanation

Chris.

[8541Hawk]

So what happens when you drill out the header obstruction at the Y joint where the Right side can mounts?

You loose a little power down low but honestly I doubt you would notice but it can be seen on a dyno

[VTRDark]

I'm impressed Mike, very good explanation

+1 This is why I prefer longer cans. Stubbies narrrrr....only if you want high dyno readouts.

You feck it up .

Lloyd you should be on stage doing stand up one liners

(:-})

[Salty Dog]

So what happens when you drill out the header obstruction at the Y joint where the Right side can mounts?

You loose a little power down low but honestly I doubt you would notice but it can be seen on a dyno

Didn't need the Dyno, i noticed it first ride.
Bike become smoother, revved out faster, but with a noticeable lack of bottom end punch that used to be there.
Not sure i have liked the change to be honest, but oh well, its done now