Was doing some surfing around and read about a boost bottle being used on dirt bikes. From what I gather, which is not a lot, the bottle is the same cc/ci as the engine and a tube connecting the bottle to the inside of the reed manifold to collect and then return the escaping charge to crankcase just as the transfer ports open to give it a boost in charging the cylinder. Any thoughts are knowledge on this?

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I don't get it.

The link I had to a picture of one didn't work...It tunes the intake just like a pipe tunes the exhaust...
Try Jim's Boat Dock, maybe there's a search function...It was a picture of a Tupperware box connected to the carb...Works like a tuned pipe on the exhaust..too big to work on a small airplane...

lots of boost bottle kits for rc truck/car use... as far as their effectiveness, i think they are a great placebo and nothing else... they are supposed to give a better idle and transition though.

The ones on the R/C nitro cars are just in the fuel line next to the carb? They just have a reserve of fuel itself.

Enjoy,

Jim

The boost bottle was used in dirt bikes, where a good low-end and midrange, along with neck-snapping response in those ranges, is much more important than high rpm usage. I don't think the latest ones use them though, cause the porting and carburetion used is much more advanced.

I dont know if conversion engines could benefit though. Probably not because most usage is in the mid-high to high rpm range. A pipe would be much better if a power boost is desired. But on the other hand, they could benefit because the carbs we are using (Walbro/Zama etc) are not really meant for a transition; they are meant for the engine to idle or be run at full throttle. So transition might benefit from using boost bottles.

Well, the only way is to "suck it and see"!

nope, nothing to do with fuel... They are to smooth out intake pulses a little... full size cars have something slightly similar on their air intakes, usually a resonator chamber built in.

They aren't mounted on the fuel line, although they connect to the engine (below or in the carb) with fuel line.

http://www2.towerhobbies.com/cgi-bin...?&I=LXAX77&P=7

Sorry, I'm not a R/C car guy. Never really looked at them close. I see what you are talking about.

Enjoy,

Jim

A boost bottle can make a significant performance gain on a piston port engine. For a case reed motor, there is little benefit.