Custom/Hybrid Wasserjet, Rotary Engine teaser video

[Melmack]

4-stroke weed eaters and other light weight 4-strokes run on pre-mix with no oil tanks.
Example: http://www.stihl.com/4-mix-engine-lightweight-and-with-good-lugging-power.aspx

It actually works completely different than that Stihl, although that's a good link. This Woelfle motor is a proven motor and should work great if these guys can get it to mass production at an affordable price.

 

[Quinc]

It actually works completely different than that Stihl, although that's a good link. This Woelfle motor is a proven motor and should work great if these guys can get it to mass production at an affordable price.

Maybe yamaha will pick it up and put it in the sj.

 

[Quinc]

Wasserjet To Exhibit At 2014 Jettribe World Finals

http://www.ijsba.com/2014/09/08/wasserjet-to-exhivit-at-2014-jettribe-world-finals/

 

[wanderer1]

What are we "gaining" with this engine? Power to weight? EPA pass? Just something different?

 

[j0hnny]

both. efficiency. power to weight is better than traditional 4 stroke. and the opportunity for boost and efi is an amazing thing.

 

[Quinc]

What are we "gaining" with this engine? Power to weight? EPA pass? Just something different?

All of the above. =)

Rotary Weight: 40lbs (Not including starter or TBI)
Power: 120hp Natural Aspirated (Turbo estimated 200hp)
Torque: 50ft/lbs @ 3500RPM
Displacement: 600cc (1020cc 4-stroke equivalent)

 

[BrightE's]

All of the above. =)

Rotary Weight: 40lbs (Not including starter or TBI)
Power: 120hp Natural Aspirated (Turbo estimated 200hp)
Torque: 50ft/lbs @ 3500RPM
Displacement: 600cc (1020cc 4-stroke equivalent)

Is this more torque than a 701 at the same RPM?

 

[Quinc]

Is this more torque than a 701 at the same RPM?

I have never seen torque numbers for the 701. Just the 63hp for 61x and 73hp for 62t.

 

[Yami-Rider]

Turbo's don't work great on pwc. A crank driven supercharger would hold up better imo. Wonder if this would be a torquier motor then a limited 701 setup?

 

[Melmack]

More hp less torque I think. Its a trade off but the weight savings makes up for that. There is no bulky exhaust too. So its like cutting the weight of the power plant in half.

 

[BrightE's]

More hp less torque I think. Its a trade off but the weight savings makes up for that. There is no bulky exhaust too. So its like cutting the weight of the power plant in half.

Wankle's have higher RPM limits too right? For a freestyle application down the road is it mostly just a matter of utilizing a higher RPM range (for low end bursts) and propping down at the same time to compensate for the lower torque values?

 

[wanderer1]

So the rotary power characteristics will not be affected by exhaust system changes or require sonic waves to facilitate a "supercharge" effect? Sooo, provided exhaust system will be the end all with no money spent needed to gain performance?

 

[yamanube]

All of the above. =)

Rotary Weight: 40lbs (Not including starter or TBI)
Power: 120hp Natural Aspirated (Turbo estimated 200hp)
Torque: 50ft/lbs @ 3500RPM
Displacement: 600cc (1020cc 4-stroke equivalent)

Assuming the torque curve just flattens off at 50ft/lbs this would put the peak (120) hp at roughly 12,600 RPMs and provide 33HP at 3500 RPMs.

 

[Quinc]

Someone at WF should go to the booth and ask all these questions and take some decent pictures to post up. =)

 

[Quinc]

from there FB page they hope to start taking orders in Novemeber.

 

[King Kang]

So the rotary power characteristics will not be affected by exhaust system changes or require sonic waves to facilitate a "supercharge" effect? Sooo, provided exhaust system will be the end all with no money spent needed to gain performance?

No, I'd imagine that there will still be a ton of aftermarket exhaust options. Think of how many performance exhaust systems exist for cars.

You're right about the expansion chambers though. Four stroke motors are efficient when it comes to fuel burning, so they won't benefit from the sonic boost that an expansion chamber provides to a two stroke. Two strokes experience that boost because a lot of unburnt fuel gets past through the exhaust as the piston goes up. The reverse sonic wave blows some of that fuel back into the combustion chamber where it has a second chance to burn.

 

[j0hnny]

can;t wait to see the price point.

 

[wanderer1]

My point about the exhaust, was options from the aftermarket providing 20+ HP gains, like a FPP SXR dry pipe for example. Surely there will be people peddling exhaust for these, but if the factory is good, with A/M providing say a 3-5% gain then the engine will be a value out of the box.

 

[Quinc]

Here we go!

 

[j0hnny]

god it fits so nice. and the battery should offset the weight of the exhaust nicely.