boost bottle

[spurdy]

too much gas and not enough air so the boost bottle makes up for that lack of air.

The volume in the boost bottle would be air/fuel mixture anyway! Sounds like there wasn't much thought put into what your teach told you.

 

SP

[AKheathen]

ok....here we go again.

 

i'll try to keep it short

 

how it works:

the resonator (original name for boost bottle) absorbs the return pulses that sneek across the reeds. the pulse causes a double-enrichment effect. absorbing the pulse makes the air pass one way at low throttle positions.

 

what it's for:

the point of eliminating the double enrichment is for better metering at partial throttle. for this reason, you do actually have to richen the pilot vs. the x-over pipe. on larger 2 stroke engines, such as snowmobile engines, there is much more noticeable effect on both top and bottom because the resonator works as a crossover passage where there was not one before.

 

what it actually does:

on the banshee- mutes the snap, giving a more gradual power increase. the only 2 uses i found for that effect are, better controll on verry technical trails, where throttle controll becomes difficult, and giving my daughter a ride around the yard, up and down hills. other than that, it just takes the fun out of playing around.

on a snow machine- if you want to keep from burning up belts trail ridding, it's a quick bolt-on solution with a slight added boost effect in the midrange, coining the nick-name "boost bottle"

 

facts:

Yamaha developed the resonator

Yamaha uses the crossover tube on the banshee because it performs way better.

the resonator was designed for 4stroke, and not as a shared chamber.

 

 

hope this helps for now. i will have dyno tests this summer running bottle, tube, and plugs on different reeds, timing, and filter setups on a low-mid bike

[TwistedSheeRida]

nice info im going to take mine off and see how it goes after

[Rodneya]

Whats going on.

 

No reply from Michael Jackson on his favorite mod. :biggrin: