madscientist
chilling with these guys.
- Location
- good old p'cola
one could use a single manifold from a dual 38 set up off a 650 to do this..
Boost Bottle for freestyle?
- Thread starter xxx2
- Start date
Melmack
(Timothy)
- Location
- New Braunfels, TX
Its already a 38 manifold and spacer. Just had a small carb.
Just a thought about the boost bottle: Couldn't someone take two of these 300 setups with the boost bottle intake manifold and mod them to fit their setup? Someone could make an adapter plate to fit other setups. This one probably fits Kawasaki twins already. To adjust for bigger cylinders, you could just run a longer tube right?
Just a thought about the boost bottle: Couldn't someone take two of these 300 setups with the boost bottle intake manifold and mod them to fit their setup? Someone could make an adapter plate to fit other setups. This one probably fits Kawasaki twins already. To adjust for bigger cylinders, you could just run a longer tube right?
WFO Speedracer
A lifetime ban is like a lifetime warranty !
- Location
- Alabama
Yes it would be a direct bolt on for a 650 engine with dual 38's, the bottles would be the correct size
Melmack
(Timothy)
- Location
- New Braunfels, TX
Just wanted to let you know what my results where with the boost bottle. Unless you are really good with tuning, I don't recommenced it. I was having the hardest time dialing in my 300 with a pipe and a seldom used carb. I had everything really close but every adjustment seemed to make it worse. As soon as I removed the boost bottle, the ski woke up and ran sooo much better. Not to say a boost bottle can't help but it makes tuning extreemly difficult. If you have a tuned setup and ad just the bottle, maybe it won't be such a hassle.
- Location
- South Africa
What has changed on the engine compared to it's oem configuration?
Melmack
(Timothy)
- Location
- New Braunfels, TX
Kerker pipe and 38 carb off a 1100 yamaha. I have tried 3 springs. The top end is always 1-1.5 turns out so its about right, the bottom has been from 2.5-1.5 depending on the spring and top end setup. I admit I need a larger bottom jet but it was night and day when I took the bottle off. The bottle may have worked fine with the original round body 34 but add a larger carb and pipe and forget it. Its very difficult to set up with the bottle in place.
- Location
- South Africa
The diameter of the pipe has to be as large as the throttle opening at which the torque dip is occurring - You went bigger on carb so the pipe is more than likely too small in diameter
The Kerker pipe has a major effect on where the torque dip is happening - The bottle is most likely totally out of resonance with the torque dip now
The Kerker pipe has a major effect on where the torque dip is happening - The bottle is most likely totally out of resonance with the torque dip now
Melmack
(Timothy)
- Location
- New Braunfels, TX
Ahh. I guess I figured that out, without all the science. So, In other words, the bottle has to be designed for your exact application. No wonder it hasn't taken off. Thanks.
Quinc
Buy a Superjet
- Location
- California
- Location
- South Africa
Running a DASA pv engine now so boost bottle won't help much. Will one-day try it when I am bored.
IMO, you will only see gains with boost bottle on dual carb applications with the crossover in the manifold blocked off. Reason being is because the crossover acts like a boost bottle without you guys even thinking about it. Block it off and run a separate bottle between carb and reed and you'll probably see a gain. I see zero gains being had in a boost bottle on a single carb dual intake. Reason for that is because the fuel charge won't go into the bottle, it will pass it and go into the other reed cage that's opening. The bottle will help a lot with the fuel spitback you notice with two strokes with a single carb or a dual carb and dual intake. It would stop your filters from turning milky white because the spitback fuel would go through the bottle and into the other opening reed cage instead of back out the top of the carb. Also I've had sleds that are Pv motors and boost bottle equipped stock. They make a difference if you understand how they are supposed to work
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madscientist
chilling with these guys.
- Location
- good old p'cola
the bottle should be tapped into the case side of the reeds for it top be functional. the reason it works on gopeds and other non-reed motors is that the butterfly is there to block back pressure. .. just a thought. once the reed are closed there is not enough pressure to charge the bottle.
- Location
- South Africa
No, that would affect crankcase compression. Think I will spend some time experimenting with my bottles again, if built correctly, they will work.
madscientist
chilling with these guys.
- Location
- good old p'cola
would the angle of the bottle port help with increasing the vaccum build up in the tube? that way the tube will draw the charge in when the intake charge is dropped?
- Location
- South Africa
No, it works on negative pressure, before there is gasflow past the outlet
A boost bottle needs to be between the throttle plate and the reed cage. No where else. That's the way they work. That's how they are designed on two cylinder, two stroke, double carb, INDIVIDUAL Intake runners on sled engines. They work. It's a simple idea that's nothing more than a crossover with an expansion chamber
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My boost bottle makes a HUGE difference.
That would be a bottle of Vodka!!! BOOSTED!!!!
That would be a bottle of Vodka!!! BOOSTED!!!!