The RD Dreams Setup
The RD Dreams Setup
If I understand correctly 2-Stroke Bikes are no longer being made in the US and some other countries.
We have been lucky that 2-strokes are still being made and sold in India. This gives us a windows into some of the latest trends in two stroke technology. Which can be applied to some of the older 2-Strokes.
One such technology is called the
YAMAHA ENERGY INDUCTION SYSTEM (Y.E.I.S, "Boostbottle")
Y.E.I.S is a very efficient invention. A small bottle ,often called
"boostbottle", is installed between the carb and the intake port
connected with a branch pipe to get the engine to respond quickly from bottom
end without flat spots.
It saves 10-15% in gas consumption and makes the engine wake up at
lower rpm.
Like many of Yamahas inventions. When it first came out there were many doubters. Just as they doubted the wisdom of a separate oil pump and the 7th port. Or Torque Induction. But if done properly this does work.
The following diagram shows a typical Y.E.I.S setup. The most common mistake people make is not placing the boost bottle above the cylinder, not getting the size right and using a common bottle for two cylinders and failing to make sure that the bottle drains back without collecting fuel.
From TSR
Since Carburators can carburate both in and out, when the charge is out of
phase with the engine it creates a double dipping intake charge (passing the
jets twice). This kills the engines ability to make Torq due to this RICH
condition, thus creating the Torq\HP DIP just before the engine starts to
take in the charge and use it all. This Power dip can be seen in both 2 and
4 stroke engines. The ~BOOST~ Bottle will help cure the problem by providing
a storage tank, of the required volume and distance to resonate at this RPM.
It stores the charge that once reversed back through the carb and returned
as a DOUBLE RICH condition.
While I agree with what they say about the boost bottle and how it works. I don't
agree with the numbers they recommend. I favor a smaller volume. With separate
chambers.
Rules of thumb: Bottle Volume has to be larger than <1> Cylinder Vol.cc.
Bottle Volume is Bottle only, Hose Volume is separate Vol.
Bottle Hose Diameter needs to be .3 <-> .5 * Carb Diameter.
IN THE BEGINNING
In this page I have included pictures of the latest Resonators as being sold on Yamahas / Suzuki / Kawasaki Bikes in the 2000 lineup..
The pictures show the resonator and special tube. I still haven't worked out how I would install this on the RD but it does plug in. And worst case I will let it stick out the sides. Best case I will trim the Tube and fit it under the Tank. Which looks very doable.
The Guys I spoke to at Yamaha had two things to say.
I haven't measured the volume of the resonator but it is designed for a single cylinder 175cc Bike. With a 28mm carb, running 165 mains, with a redline of 11,000 RPM. So it should be perfect for the RD
If you come back to this page in a day or two I will have a collection of resonators from Suzuki, Kawasaki, and Honda. And finally my own design.
All using different shapes. The Kawasaki Resonator has a rectangular shape. Which is more suited to fitting on the RD. The Yamaha Resonator has the most radical shape. These resonators are fitted on new bikes after the FACTORIES TEST VARIOUS CONFIGURATIONS ON A DYNO.
Item: Yamaha Resonator
Size: 300cc
Engine Capacity: Originally from the RXZ 135cc.
Findings: I suspect this would be the best size to run but due to its odd shape and size getting it to fit under the tank is close to impossible. Im not saying it cant be done. But it cant be done neatly. If you don't mind it sticking out the side a little it will work fine.
This was the Yamaha Resonator. Next I will do the Kawasaki Resonator. And finally the most neat install will be shown.
In the 3rd picture it looks like if I shorten the pipe it would go under the tank. I hope this is of some help to all of you out there working on boost bottle setups, U Tubes and Resonator tuning.
Kawasaki Resonator / Bottle.
For now I'm just plugging them in and running them to compare which is best. Once I decide which is best I will do a neat installation under the tank. The present setup allows me to swap resonators on the road. So far I haven't noticed any difference between the Kawa and Yamaha setups. But my bum Dyno tells me that there is an improvement over the U tube setup. You can see in the above picture that if the tube was cut shorter the Resonator would tuck neatly under the tank.
Item: Kawasaki Resonator
Size: 220cc
Engine Capacity: Originally from the KB100 100 & 130cc Bikes.
Findings: The KB resonator due to its shape install very neatly. You just need to trim the tube by two inches and it will then fit in over the cylinder head and below the tank. If you use a really short tube. You can fit it directly over the carb manifold. All in all a very neat install. I will post pics soon.
Summary: I truly believe that running the bike like this does make a difference and I will keep this configuration for my drag bike.
Summary:
The Kawasaki resonators with a shorter pipe fit neatly under the tank (Pictures to come). They are not directly over the cylinder head but they are over the piston TDC which is just as good.
STAGE1:
If you dont want to get too radical with the setup and just want to upgrade from you plain RD manifolds to the later RZ techonology then you can go for a Manifold with Pipe setup. 10$ each pictured below. They are a direct bolt on for most R.D's they come with a special thick tube and a steel cover which is placed over the tube to protect it from the engine heat.
This is how it looks installed on the Bike.
You can now run a cross over pipe. Between the carb's and you have your basic RZ style setup for your old RD. Or we can supply the pipe and two clamps for 5$. The advantage of the Brass tube setup is that you can later convert this to a Boost bottle setup by using a small section of pipe and a resonator bottle.
Stage2:
If you want to get more radical with your setup you can run the Bras Pipe Manifolds which connect too two separate resonators with a small section of pipe. We can supply the Two Pipes, Four Clamps and Resonator of your choice for 5$ each.
Stage3:
If you want a complete race setup then we can do a metal cylinder with two pipes that plug directly into the Manifolds. For this setup you would need the RZ Style manifolds. These manifolds have a rubber neck which is identical to the RZ manifolds but the size of the manifolds is the same as the RD manifold. Metal Chambers are designed to your specs most popular size is 500cc. This is known as the common bottle where both carbs are connected to the same resonator.
You will need:
RZ Style Manifold Kit 35$ for Pair with Clamps.
And a Metal cylinder which is custom built to your spec. For 5$
Pictures of the RZ Style Manifold.
Picture of shared boost bottle:
(Coming Soon.)
Update: We are no longer making the RZ Style manifold. There simply isn't a market for this product. So your options for a manifold with boost bottle is not limited to the Manifold with brass pipe or a RZ Manifold.
Ok so we finished playing with the different resonators. Our findings where that the shape really didn't matter that much. And why not do this the proper way. Which is when we struck upon the idea of making bullet shaped full chrome boost bottle. That would fit directly above the Carb just the way Yamaha had designed the system to work.
We tried every size and combination here. From common chamber to isolated chambers from 4 Inch bottles to 9 inch bottles.
Here are some pictures of our Boost Bottle. Also included a picture somebody mailed me.
Dimensions:
The boost bottle above is 2.5" in dia. and 9" in length. Both the chambers are isolated from each other by a spacer in the center. The domes shape at the ends helps increase the volume of the bottle. This bottle was designed for a friend Martek. I am also running the same bottle on my street RD.
Picture of Boost Bottle made by another company
These bottles will work on a RZ350. So if you own a RD350 the only option is to install the RZ manifolds and then install the bottle. As we are no longer selling the RZ manifold kit for the RD.
If you don't want to install the RZ manifolds then the only option you have is to run the Manifold with Brass Pipe and a U tube.
The most critical factor is that the Gas collected in the bottle should be able to fall back into the fuel circuit. for this to happen the drain plug should not be protruding inside the bottle. Test Fill the bottle with water. No turn it over and hold it in the same position your installing it. Every single last drop of water should drain out. No water should be left sloshing around inside the bottle.
The boost bottle is now available with the original RZ manifolds. We also offer the RZ reed block with glass fiber petals. Notice the larger intake area on the RZ manifolds.
The setup below has been custom built for Jan-Tore in Finland.