Exhaust crossover?

[Cyclops66]

Never seen this before. One pipes?

 

[thughes317]

Gen 1's

 

[gunslinger_006]

Yup my gen1 has that.


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[TenereGUY]

I've seen it on lots of hotrod exhausts. Makes for better scavenging of the cylinder and less back pressure.

 

[Jlq1969]

I've seen it on lots of hotrod exhausts. Makes for better scavenging of the cylinder and less back pressure.

but in the S10, with individual oxygen sensors, “after” the crossover, it would not make sense….it must have only given more rigidity, which maybe later it did not make sense that is why stopping putting it

 

[JJTJ2]

Could it really be just a structural spacer without any crossing of the flow? But this is purely a guess on my part

 

[Tenforeplay]

I think it’s a crossover. Why would they weld it all the way around in such a neat fashion. But my guessing is 50/50.

 

[Sierra1]

My money is on scavenging. I also think that it didn't give the results that it does on hot rod V-8s, and that's why it's not there anymore.

 

[thughes317]

Crossover for massive HP gains. The industry forced them to remove it on Gen 2's due mainly to lobbying from KTM and BMW.

 

[Longdog Cymru]

Could it really be just a structural spacer without any crossing of the flow? But this is purely a guess on my part

No, it’s not structural, I seem to remember in the dim and distant past that Yamaha removed this link pipe on the Gen 2 and gained another 2bhp . I shall have to look up my old press release notes.

And here you go! An additional 2bhp and 1.5 ft/lbs of torque

2014 Yamaha Super Ténéré - First Look

www.cycleworld.com

.

2014 Super Ténéré Gets Major Updates, But Is It Enough? - ADV Pulse

The 2014 Super Ténéré receives major updates like electronic suspension, heated grips and more power. But will this bridge the gap to its European competition?

www.advpulse.com

 

[Jlq1969]

I think the only place where the S10 had 2 HP more was in the magazines... In the official Yamaha pages, the S10 always had 110 HP... or 112 CV (which by conversion is 110 HP)

 

[MattR]

Could it really be just a structural spacer without any crossing of the flow? But this is purely a guess on my part

I think that is probably the case. My Zx14r had the same in the OEM pipes but they did not connect. The way to tell is to look for small drain holes in the cross piece


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[Cyclops66]

So that little crossover on gen1's only was worth 2hp.
I never got alerts for the replies... felt a little sad then I looked and saw the traffic and maybe peed a little.

 

[fac191]

Arrow headers are better

 

[Cyclops66]

I think it’s a crossover. Why would they weld it all the way around in such a neat fashion. But my guessing is 50/50.

Wouldnt this be food for thought.. Like a Fat Twin and a skinny twin who's bogarting the food?
Firing cycles are off by weird degrees and not 360-720
It has to have an effect on jetting one would think one cylinder and don't ask me which would benefit but O2 sensors probably manage it so worst case it makes better thumpage.

Yamaha XT1200Z Super Ténéré Specifications

ENGINE
Type: Liquid-cooled, 4-stroke, DOHC, inline 2-cylinder, 4-valve, fuel injected, twin spark engine
Displacement: 1199cc
Bore x stroke: 98 x 79.5 mm
Compression ratio: 11.0:1
Firing intervals: 270- and 450-degree points
Max. Power: 80.9kW (110PS) @7,250rpm
Max. Torque: 114.1 Nm (11.6kgf?m) @6000 r/min
Lubrication system: Dry sump, oil tank in crankcase
Fuel supply system: Fuel injection
Ignition system: Twin spark
Starter system: Electric
Transmission system: Constant mesh, 6-speed
Throttle system: Yamaha Chip-Controlled Throttle (YCC-T)

 

[Tenforeplay]

Money, that's always the elephant in the room.