MOPED ARMY

Boost - Bottle Polini

bp

i've seen them in pics of some super mobys in france but it's definatly not popular.

curiouse to actually try one on my shitty bike it has a bogging problem when u first give it gas

also it's like having nitrous on an import...all that fast and furious shit gave the REAL import racing scene a bad name. why the hell would you need it if your car is already fast? bottle and quick fixes scorch your internals

Cory

also sam, whoever made that pink bike is a dumbass with a lot of money.

he bought the most expensive parts, HPI (300$) and a Jolly Moto exhaust (400$) and just bolted them on. the jolly moto is hand designed and has specific thickness metal in certain areas, specifically tuned for heat dispertion. i mean serious thought and tuning go into this.

and what does that jackhole do? he heatwraps the header. thats for 4 stroke tuning. so yes,

no real tuners have boost bottles lol.

dont tell this guy: pocket bike forum break>

"Boost bottles do work, but even the pipe length between the manifold and the bottle is critical. If the pipe is too long or too short then the reflected pulse will be out of time with the opening of the reeds so some experimentation would be needed.

Two stroke engines are very sensitive to small things like volume or length changes. Think of it like a musical instument like a trombone, slide a trombone's slide out making it longer makes a lower sound, slide it in making the pipe shorter makes a higher sound. Longer intake manifolds and exhausts are tuned to lower speeds and shorter manifold and pipes to higher speeds. This is where the word TUNING comes from. This is also why 2 stroke motors have a power band, when you reach the speed when these things come into tune the motor sings. If you get everything just right (right pipe, right porting, right carb/air filter) everything sings together and you get that lovely power band that i love about 2 strokes. Adding a boost bottle just adds another factor that you've got to get right or you will loose power. So best just stick with a good carb and pipe, have your barrel ported and get some 1.5 clutch springs. Now we're doing wheelies.

PS If you do decided to fit the bottle it is supposed to be connected between the carb and the reeds, not to the crancase or you will just increase the volume of the crancase = less power for sure. Think about it , piston comes down compressing the mixture in the crancase until the transfers are uncovered, the less space there is, the more compressed the mixture is the faster the gas will flow up the transfers."

I thought boost bottles were nearly completely ineffective on a reed valve based engine, due to the reeds being closed when the bottle is supposed to be doing its thing. Makes sense to me that you would have to place the tap for the bottle somewhere in the case, before the reeds?

can anyone confirm this?

so do thik its better to open ur reeds more ( the metal flap behind them) or just keep it at like 1cm or how ever they come, for example a tomos reed, stock and or airsal.

-Samz

its a totally differnt question, nothign to do with the bottle

boost bottles were standard fitment on some yamaha 2-stroke motorcycles,they plugged into the inlet manifold so were fitted before the reeds,yamaha definitely know what they are doing so they must work if designed,made and fitted correctly.

hmm found this too interesting, looks like the "bottle" is a rubber boot and the spring goes inside then from all the sucktion it tightens then when the throttle is relaesed it opens up sucking the fumes and gas in, then when the thrttle is hit again it sucks in in , looks pretty sweet

http://mopshop.de/shop/product_info.php?cat0=441&cat1=1264&cat2=1267&cat3=TW90b3J0ZWlsZQ==&products_id=6713&osCsid=94fc6599a36d3e40e32bf92720ad387b

wtf the link is ther,the pic wont show

gay