JapMax

[bwalker]

Yamaha, Suzuki et. al. have had seperate charge and scavenge air forever, and the scavenge air is always last in and always helps push the exhaust out; that

I have never seen a model like this. The jap sytems I have seen used a reed valve and traditional porting. I have never seen a sytem that used pure air to scavenge the cylinder .

BTW two stroke street bikes rule. I own a RZ-350 with Toomey race pipes .

 

[jimbo1490]

The motorcycle engines always ran both the scavenge air and the main charge air thruogh the single carbeurator. They could easily have kept it sperarated; they just never saw any need for that. Even the Puch 250 kept the charge and scavenge air seperated all the way out-but then they used another carb for the scavenge air! Each had a piece of the puzzle but not the whole picture. Which is why I say that this is evolutionary.

Jimbo

 

[Saw Man]

Red Max (Komatsu/Zenoah) has a patent on the First Generation Strato Charge engine design. It used a two barrel carb (see Walbro web site), and external tubes carrying a "cushion of fresh air" (like Ben's wording) thrus reed valves at the top of the transfer ports.

NEW...Second Generation eliminated the external tubes, and reed valves. Uses slots cast & machined into the piston skirt. They now carry the "cushion of fresh air (I like that description) to the transfer ports.

Advantages are:
Less parts,
Faster acceleration,
Little cleaner burn,
Flatter torque curve, and last but not least
A little better fuel economy


Red Max is so far advanced on these designs....they made engines for Stihl, and now have licensed other competitors to use the technology...but only on the First Generation.

I've threatened to send Ben and the AS some pictures before, but have just been too busy.

Have a VHS video, and , laptop disc showing the First Generation I'll try set up so it can run off the AS.

Trouble is...I don't know how to do it. If someone will walk me thru it I'll be happy to do it.