A warning to those looking to mod their motorized bicycles:

Most, if not all, of the hacks and mods featured on this site were made by individual hobbyists. If you are new to working with 2-stroke bicycle engines, please by aware that there's a possibility that a mod featured on this site could seriously damage your engine. Please don't try any mod from this or any other site unless you fully understand what you are doing. The owner of this blog will not be held responsible for both material and bodily damage caused by performing a modification featured on this blog. Also remember that opening up your engine may void your warranty!

Saturday, October 15, 2011

Candlestick velocity stack

A velocity stack eases the flow of air into the carburetor.  Wikipedia says that a velocity stack for an engine does two things:
  1. Allow smooth and even entry of air at high velocities into the intake tract with the flow stream adhering to the pipe walls.
  2. Modify the dynamic tuning range of the intake tract by functioning as a resonating pipe which can adjust the frequency of pressure pulses, based on its length, within the tract.
In other words, it works like this:

Instead of permanently polishing out the NT carb intake like others done, you can get a similar effect by having a velocity stack.  Bairdco made one out of a candle holder from a swap meet.

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