Re: so no real tuner have boost bottle? really

Matt Smith /
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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."

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  so no real tuner have boost bottle? reallyTopic by: Samz Samz 10/11/07 01:44AM
  Re: so no real tuner have boost bottle? reallyRe: Samz Samz 10/11/07 01:46AM
  Re: so no real tuner have boost bottle? reallyRe: Samz Samz 10/11/07 01:46AM
  Re: so no real tuner have boost bottle? reallyRe: John Joedicke John Joedicke 10/11/07 07:54AM
  Re: so no real tuner have boost bottle? reallyRe: Peter Peter 10/11/07 10:17AM
  Re: so no real tuner have boost bottle? reallyRe: elliot on bella elliot on bella 10/11/07 12:57PM
  Re: so no real tuner have boost bottle? reallyRe: homoped homoped 10/11/07 01:01PM
  Re: so no real tuner have boost bottle? reallyRe: Cory Cory 10/11/07 01:25PM
  Re: so no real tuner have boost bottle? reallyRe: Matt Scout The Scouting Dcon Matt Scout The Scouting Dcon 10/11/07 03:58PM
  Re: so no real tuner have boost bottle? reallyRe: joeho joeho 10/11/07 02:13PM
  Re: so no real tuner have boost bottle? reallyRe: homoped homoped 10/11/07 02:48PM
  Re: so no real tuner have boost bottle? reallyRe: rafter rafter 10/11/07 03:21PM
  Re: so no real tuner have boost bottle? reallyRe: Matt Smith Matt Smith 10/11/07 03:38PM
  Re: so no real tuner have boost bottle? reallyRe: peter peter 10/11/07 08:44PM
  Re: so no real tuner have boost bottle? reallyRe: elliot elliot 10/11/07 08:57PM
  Re: so no real tuner have boost bottle? reallyRe: Samz Samz 10/11/07 09:00PM
  Re: so no real tuner have boost bottle? reallyRe: elliot elliot 10/11/07 09:38PM
  Re: so no real tuner have boost bottle? reallyRe: Steve Williams Steve Williams 10/13/07 10:23AM
  Re: so no real tuner have boost bottle? reallyRe: Crackstar X Crackstar X 10/13/07 11:00AM
  Re: so no real tuner have boost bottle? reallyRe: Samz Samz 10/19/07 04:17PM
  Re: so no real tuner have boost bottle? reallyRe: Samz Samz 10/19/07 04:17PM
  Re: so no real tuner have boost bottle? reallyRe: Samz Samz 10/19/07 04:17PM
  Re: so no real tuner have boost bottle? reallyRe: Saabsonettguy . Saabsonettguy . 10/19/07 04:29PM
  Re: so no real tuner have boost bottle? reallyRe: acting on OG leefungchow acting on OG leefungchow 10/19/07 07:54PM

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