Exhaust??

[Yamacat21]

I actually think this exhaust is going to be a problem. A Yamaha engine was stuck into the AC chassis and the exhaust was made to fit into what little space they had. I don't think the exhaust system was thought out very well. The flex pipe is to far away from the engine and the header is bolted to the tunnel. I see the header eventually cracking due to vibration and flex between the engine and tunnel. Most likely at the tunnel mount. Time will tell.

That is a good observation, like you said time will tell. I'll let you know if mine ends up in the shop for a broken header. Good thing I got the five year warranty I guess. Lol

 

[Suckur]

Ok, so you can see from this photo I just took how low and how far back the fuel tank goes and as well how low the muffler sits. The bulk of it sits as low as the engine does, some of it lower. So by placing the fuel on the tunnel and the muffler at the lowest point possible you get an incredibly low center of gravity, a better balanced sled and best of all no ice in the tunnel! Especially with a viper that has no rear heat exchanger. You Viper guys are gonna be bragging up your machines so much next year! Go team YamaCat!

 

[Yamacat21]

Great post!

 

[cannondale27]

I actually think this exhaust is going to be a problem. A Yamaha engine was stuck into the AC chassis and the exhaust was made to fit into what little space they had. I don't think the exhaust system was thought out very well. The flex pipe is to far away from the engine and the header is bolted to the tunnel. I see the header eventually cracking due to vibration and flex between the engine and tunnel. Most likely at the tunnel mount. Time will tell.

From what I have seen the header is not bolted to the tunnel.It is just resting on it at the 180 bend.

I do agree though that there may be issues with cracking.When cold snow hits metal it is very hard on it.I would much rather see the exhaust not in contact with any snow.I also suspect this design may form a Ice chunk at front of tunnel.Hopefully not though.Need to trust Yamaha to figure it out.

 

[berge75]

The first issue I see, that header was made by Cat...just check out the welds. Headers like to break by the flanges, and with the lack of flex joints, it could be cause for concern. I hope they have the header encapsulated like the Nytro, otherwise their going to be putting a lot of heat into the driveshaft, and it's bearings. As far as trusting Yamaha to fix everything a few things come to mind... skis, small idler wheels, hand warmers that work , weak subframes, but who knows, since Cat addressed some of these issues already, maybe Yamaha is working on other things?

 

[snoway]

Ok, so you can see from this photo I just took how low and how far back the fuel tank goes and as well how low the muffler sits. The bulk of it sits as low as the engine does, some of it lower. So by placing the fuel on the tunnel and the muffler at the lowest point possible you get an incredibly low center of gravity, a better balanced sled and best of all no ice in the tunnel! Especially with a viper that has no rear heat exchanger. You Viper guys are gonna be bragging up your machines so much next year! Go team YamaCat!

that's a pic of your suzuki powered cat right?....I don't know much about the engine on that sled....does the exhaust face the front or back?

If it exits to the back does it do a 180 under the tank like the vipercat?

 

[snoway]

The engine sits lower in the Nytro chassis.

 

[DeerHuntr]

The engine sits lower in the Nytro chassis.

Not sure if this is true or not but the bottom line is even If it does it makes no difference because the Viper handles 10x better regardless. I honestly couldn't tell the difference in handling between my buddies procross 800 and the viper I rode. Where the engine is mounted is a non issue because they got it rite, its VERY happy right where they have it.

 

[Suckur]

Ok, so you can see from this photo I just took how low and how far back the fuel tank goes and as well how low the muffler sits. The bulk of it sits as low as the engine does, some of it lower. So by placing the fuel on the tunnel and the muffler at the lowest point possible you get an incredibly low center of gravity, a better balanced sled and best of all no ice in the tunnel! Especially with a viper that has no rear heat exchanger. You Viper guys are gonna be bragging up your machines so much next year! Go team YamaCat!

that's a pic of your suzuki powered cat right?....I don't know much about the engine on that sled....does the exhaust face the front or back?

If it exits to the back does it do a 180 under the tank like the vipercat?

The exhaust exits forward then turns left initially, making a 270 degree turn before turning 90 degrees down to the muffler. The viper turns 180 degrees. Most motorcycles exit the front and turn 180 degrees before exiting the rear. I wouldn't be too concerned about the viper's exhaust making a U turn.

 

[fxnytrortxkid]

Did nobody ride more than the last 5 years of their lives. Motors with airbox by handlebars, exhaust exiting front of engine and making a 180 bend back and dumping into an silencer in the same spot this one is. It's no different than current dirt bikes or road bikes and it is the same as the sleds from "back in the day" early 2000s

The header on the cat and yamaha will be entirely different, cat had their design yamaha has theirs and they will build them which their production runs.

The prototype sleds were built and assembled by cat for yamaha AS A PROTOTYPE. So the fit Finnish and quality u want will not be there. The final pieces will be up to par I am confidant.

 

[AKrider]

I believe the Viper will be down on HP from the Nytro due to the exhaust. I think the improvement in ride and handling will be worth the tradeoff however.

 

[Bad Attitude]

Unbelivable. Monday morning engineers, sheer speculation, hearsay and rumors. Sounds like the Yellow Koolaiders again. What I like to know is how the Yellow shirts get a free pass when they release protos that blowup, bend, break. At the show in Syracuse did not see the Yellowshirts letting the public under the panels of that new their new 900. What are they hiding? Gee copied a four-stroke Yamaha motor again did we BRP? Kinda flattering that BRP copies an outdated Yamaha engine design as some claim.

 

[shadow44]

I was speaking with Hindle about this exhaust...his thoughts were that the bends were smooth so flow shouldn't change that much...worse case scenerio is it might be down a couple of hp...the bends won't affect it as drastically as some think....check out most of the Doo 1200 headers/full systems...they have no issues making great HP and they have long primaries, a large bend and then back to the muffler via a long mid pipe....making 150hp on this sled will not be an issue.

 

[Alatalo]

...the bends won't affect it as drastically as some think...

Exactly. Claiming that horsepower can only be found in straight exhausts is non-educated speculations based in 1960's tuning. A smooth, big radius bend is no flow restriction at all. You can read loads of books about it and you can download freewares that will tell you through calculations. Or just look at any modern sportsbike. They make close to twohundred litre horsepower through a cathalytic cleaned exhaust that is full of very tight bends. Or look at MotoGP. The bike in the attached pictures makes more than twohundredseventy litre horsepower even though the exhaust makes a full 360 degree bend. Correct exhaust length is obviously much more important than a straight pipe without bends.