2021 Brochure available

[shnknapp]

Hey all. Yamaha finally released the 2021 Brochure. I'm really disappointed in the new website so I've been waiting for the brochure so I could really get a good look at features without having to deal with the the slide ins/out that brought me back to Microsoft PowerPoint.

https://www.yamahaboats.com/globalassets/_boats/all-boats/yamaha-2021-boats-brochure-english.pdf

 

[Sean R]

I am trying to back in to the link you posted but can't get it to work. I would like the brochure for the 2020s

 

[anmut]

I know it's not, but that sure looks like a turbo!

 

[2kwik4u]

I know it's not, but that sure looks like a turbo!

Gear driven Centrifugal Supercharger. The compressor side is essentially a turbo, but instead of being driven by hot exhaust gasses like a turbo, it's drive from a gearset on the front of the engine.

Prochargers use the same premise in the automotive world.

 

[anmut]

Also, Yamaha marketing dept. not doing them any favors as a consideration of a serious surf boat... that wave is so WEAK. 96k for a pocket the size of a square foot... eeeh - might be a lot of 25' wake boats on sale in a couple of years.

 

[anmut]

Gear driven Centrifugal Supercharger. The compressor side is essentially a turbo, but instead of being driven by hot exhaust gasses like a turbo, it's drive from a gearset on the front of the engine.

Prochargers use the same premise in the automotive world.

Is that new for 2021? I thought Yamaha like to stick with superchargers. I must've missed something.

 

[biffdotorg]

Is that new for 2021? I thought Yamaha like to stick with superchargers. I must've missed something.

That's exactly what he was saying. It's not a turbo, but a supercharger. Yamaha uses Superchargers in their marine engines. They offered this sort of Supercharger once prior in the Yamaha Apex Snowmobile, which was belt driven. They called it the Yamacharger on the 4-cylinder Apex engine. All third party options for sleds, SXS etc have been Turbos.

Thanks for the explanation 2kwik4u as I can't say that I knew that detail. As I saw the Yamacharger many years ago, and thought the same thing, looks like a Turbo, without all the plumbing, which we had no room for on a sled.

 

[shnknapp]

I am trying to back in to the link you posted but can't get it to work. I would like the brochure for the 2020s

I just got to work and realized I had a copy of the 2020 brochure.

 

[tkeru408]

Disappointing the new 2021 brochure doesn't have the handy comparison chart at the end like the previous brochures did.

 

[shnknapp]

Disappointing the new 2021 brochure doesn't have the handy comparison chart at the end like the previous brochures did.

I noticed that too. I can't fathom why they would leave that out.

 

[anmut]

That's exactly what he was saying. It's not a turbo, but a supercharger. Yamaha uses Superchargers in their marine engines. They offered this sort of Supercharger once prior in the Yamaha Apex Snowmobile, which was belt driven. They called it the Yamacharger on the 4-cylinder Apex engine. All third party options for sleds, SXS etc have been Turbos.

Thanks for the explanation 2kwikfu as I can't say that I knew that detail. As I saw the Yamacharger many years ago, and thought the same thing, looks like a Turbo, without all the plumbing, which we had no room for on a sled.

Oh duh, he did write that... LOL

 

[anmut]

I noticed that too. I can't fathom why they would leave that out.

Printing is expensive and they have 1000 new model versions to talk about this year?

 

[Jim Davis]

Don't the BRP superchargers have a 200 hour limit before overhaul? Any idea if the Yamaha superchargers are the same?

 

[2kwik4u]

Is that new for 2021? I thought Yamaha like to stick with superchargers. I must've missed something.

Not new. Same thing they've been doing for year.

The good part of a turbo is the efficiency of the scroll in the compressor at high RPM's. Here's a compressor map (for some other turbo), but you can see you are getting into the high 70's low 80's for compression efficiency at some places.



You read this by looking at the mass flow of air on the x axis, then reading your pressure ratio (14.7psig of boost at sea level is a pressure ratio of 1.0). Where those two points intersect on the graph you can see how efficient your compressor is. More efficiency means it takes less power to turn and has cooler air. And vice-versa.

In a turbo application you are spinning the compressor with a turbine that is run on hot exhaust gasses. This is pretty much one of the closest things to a "free lunch" you can get in engineering. You're using wasted energy ( in the form of hot exhaust gasses) to do work (drive a compressor) in a positive feedback system (more exhaust -> more boost -> more exhaust, etc). The problem with a turbo in the marine environment is Exhaust Gas Temps. EGT's are hard to control and keep at reasonable levels in a normally aspirated condition, and even more so in a turbocharged condition. Despite the HUGE heat sink that is the water the boat is sitting in. Flow rates, packaging, and casting issues would be big hurdles to overcome in turbocharging a marine engine, assuming you wanted long life from it, and plan to run it "on boost" for very long. Honda figured it out some years back in their PWC's that had a turbocharged 4cyl.

SOOOO......A gear driven scroll type compressor is a pretty wise choice for a marine application. The gearset will often outlast the bearings in the compressor and provide very reliable service. The compressor is a high effeciency device in general. Then you also have a TON of lake water to use as a heat sink to cool the hot compressed air back down before shoving it in the engine.

Sorry for the novel, I enjoy this stuff. Should've been a marine powerplant engineer!

 

[Neutron]

Don't the BRP superchargers have a 200 hour limit before overhaul? Any idea if the Yamaha superchargers are the same?

No rebuilding interval at all.