How does a Boost Bottle work?

[happycheapskate]

EDIT: some of the commentators are calling this a "gas box", and some say it has a spring inside.

http://www.youtube.com/watch?v=j8eA0kDM0YY&feature=related

Video shows boost "bottle" that is some kind of rubber, telescoping tube.

Wierd, it looks to be blowing out/increasing in size as the engine revs.

re: supercharger hahaaha. Some people are using Ford F150 smog pumps on 5hp Briggs 4stroke engines and apparently it works if done well, till you over-rev it and blow the gasket.

I wouldn't even bother trying to do something like that to a 2hp china bike motor.

The boost bottle thing is worth fooling around with once though. I figure I could recoup my 15 bucks easily by selling it to someone else who wants to play with it, or just miss out on one night out at Chilis to find out if it worked or not. hahhaaha.

This video shows an experiment with a boost bottle on a motobecane moped. The film maker says he inflated balloon inside the bottle before closing the lid, then attached it to the running line.
http://www.youtube.com/watch?v=y80MOk3IpSs&feature=related

 

[DuctTapedGoat]

Bam, that's how to do it. I was thinking about springs and large syringes and also balloons. That actually looks like it would serve the purpose the boost bottle claims to! Good find!

 

[technomancer]

So... uh, did you ever install the bottle on your bike?
if so, what did you think of it..?
lol i read 3 pages of your posts hoping for personal experience.

i lean toward a placebo effect on performance.
but i feel like it could help with idle.

the engine's not creating enough pressure in the bottle to really force any more air into the cylinder. you can see that from the balloon.
the longer intake tube seems like its the way to go.
IMHO

 

[happycheapskate]

I haven't because the bike has been in storage while I have had other obligations.

Something of interest, the large 32oz bottles of Slime sold at OReilly's have a barb-fitting that works great with the same kind of hose used with the boost bottle intake manifolds. I plan to try the washed-out Slime bottle also, when I get to ride the bike.

The engine does not create any pressure in the bottles. The engine creates vaccuum, which fluctuates with the engine cycles. The boost bottle is supposed to dampen these and absorb any "blow-back" into the short intake manifold tube, and perhaps help atomize fuel that enters the bottle.

 

[goodtime65]

Yeah right... "sweet spot" my foot. If a longer intake Mani makes all The difference, then why does boost bottle industries sell a pre threaded intake tube that is exactly the same as the stock tube? You would think they would know best on how to make their product work... And offer the so called "sweet spot" tube to people willing to pay for it. How did that nos drink boost bottle work out???

Bob... If you can make on of these things work, then prove it. Install one in working condition and post a vid. If not stop telling people "they work, you just need more info".... Because tO the best of my knowledge nobody reputable has made one work. This is the second thread you mention this within your first two posts, very strange for a noob to promo a specific failed product twice in their first two posts. They usually ask a question like "what engine should I get, or my clutch/carb doesn't work". Do you work for boost bottle industries or something?

For everybody else... IF you think you can make it work, i have one sitting in my garage right now, pay for shipping and it's yours. You can get more performance for less money by milling your head down with some files and sandpaper.

they do work and I will post a vid

 

[Scottybotty]

They'll work if you take the time to dial in the carb and ensure no intake/exhaust leaks. New gaskets and soldering the boost bottle fitting in place. Ensure the fitting doesnt protrude inside the intake by filing it smooth to the inside wall. This really isnt a "Bolt On" Mod and I think a lot of people get frustrated and throw it away...... Too bad because the engines run great once set up properly.

 

[adrian101]

how do they work? Well first of all it didn't work for me. I tried everything to tune the carby to it but failed every time. I think it's my engine which is the fail to except such an awesome mod.

I have mine in my spare parts box collecting dust. I had a stock exhaust when trying to use mine, Now i have a SBP Expansion Chamber so i might pull the Boost bottle out and test it again.

 

[olow]

ok im no real mechanic but a machinist i am i think the part about a longer tube has something about as when i was 16 a guy i knew would always raise his carb up off the intake to gain more speed and rev something about gas /fumes /distance travel

 

[DuctTapedGoat]

The boost bottle is nothing like a carb intake extension - it's a resonating vacuum.

The important part is that the bottle itself matches the displacement of the piston.

 

[happycheapskate]

Here is my experience with the boost bottle

I bought the boost bottle kit from another user on this board (thanks, Give Me Vtec!). It is a 50cc bottle, I think. I have not tried filling it with water or something to test it. It came with 1/4" plastic hose, and a smooth aluminum intake tube with a brass fitting already attached. The fit was perfect, and easily replaced the stock intake tube (new gasket of course).
The brass fitting does not protrude into the air path. The inside was smooth, and the bend near the carb. was much smoother inside than the original piece.

On the first run, it started easily (still warm engine) and ran weak. I put it back on about 1/4 choke and it ran great. So I parked the bike and moved the c-clip on the carb. fuel metering pin 1 notch, to give it more fuel.

Technomancer, I have just installed this today, so I have not tried any other bottles, but since I have some leftover 1/4" hose, I suppose I could try other bottles easily. The Slime (16oz) bottle has a barb on the cap that fits the same hose. The NOS Energy Drink bottle could possibly fit the same bottle cap, or I could drill the cap or bottle and fish a lawnmower tire valve (remove the valve core) through it. I think it would look cheesy but little kids would probably love it. If the stickers peeled off it would just be a blue plastic bottle.

After warming the bike up properly, it ran fine, idled nicely (where before the bottle addition it was choppy), and pulled ok, and ran well at top speed with a lot less "four stroking" when decellerating or reaching and holding a speed. I turned the idle screw out so the bike would die, but it idled smoothly for a little bit, then died smoothly instead of quickly as without the boost tube. (I have been running mine so it will die when throttle is let off, as I use the engine brake effect on hills and when stopping hard. I guess I don't have this now without using the choke lever, but I'm convinced the bottle works, and the bike runs better.) All said and done, I don't think the bike speeds up or tops out much faster if any, but it did idle much more nicely, and can pull at lower RPM without jerking and lurching (great for parade rides). I am happy, for $15. I don't think I'd want to pay more.

They'll work if you take the time to dial in the carb and ensure no intake/exhaust leaks. New gaskets and soldering the boost bottle fitting in place. Ensure the fitting doesnt protrude inside the intake by filing it smooth to the inside wall. This really isnt a "Bolt On" Mod and I think a lot of people get frustrated and throw it away...... Too bad because the engines run great once set up properly.