Building A Boost Bottle From A Gatorade Bottle And 4$ At The Hardware Store

DAMIEN1307

Moderator
Staff member
Local time
5:11 AM
Joined
Jul 23, 2020
Messages
5,544
Location
Alamogordo, NM, USA
If @Street Ryderz sees this thread, he may have some insights regarding the pros and cons of boost bottles.
I can guarantee you that he will agree with my assessment of them installed on a basic China Girl motor motorised bicycle...Yamaha originally designed the first one back in 1980 for their full fledged motorcycle designed engines...DAMIEN
 

Street Ryderz

Well-Known Member
Local time
7:11 AM
Joined
Oct 14, 2016
Messages
4,450
Location
Hamilton Ont
Boost bottles are a joke, Just like the power bands and muffler bearings Wrench has shown that vendors will gladly sell to any unknowing just trying to make a buck! Boost bottles when the whole system is volumetrically correct, meaning that the bottle, line and fittings and also the total length are matched to the displacement of the engine and then tuned still add no power gain all they do is take the reversion of the intake pulse and give it somewhere to go rather than be spit back out the carb keeping the air filter cleaner longer, then on the next intake pulse it pulls from the bottle any charge (a/f mixture) that hasn't neutralized with it, this is helping very little and only applies to the lowest rpm usually just off idle since it's a resonant system and as rpm increase it becomes too slow or miss timed to do anything! Yamaha tried this system with a tuned airbox and found it was unnecessary with little to no gains and scrapped the idea, again if this were a viable system all the manufactures would use it, they spend millions of dollars doing R and D with decades of engineering behind them, they know what works and doesn't and most importantly WHY ! A properly tuned carb and setup engine will give you all it has to give every time and be predictable in doing so, it's far better to have a reliable engine than one that works well only in certain areas and stumbles in others, and if you want to add mods do one thing at a time so that you can go back easily and know what just failed.
 

Karl Snarl

Well-Known Member
Local time
6:11 AM
Joined
Sep 20, 2019
Messages
5,703
Location
Chunky Monkey Mole Hole
Hey!

I just got into motorized biking a bit ago, about 3 months I've had mine finished, and I just finished breaking it in.
As a kid whos trying to get a job, I cant really afford too many upgrades. I did want to get some cheap ones like a new banana exhaust, boost bottle and like a spring loaded chain tensioner. While looking though, I saw boost bottles are not anything special and just a bottle that goes into the carb. So I got the carbuerator tube that goes from the carb to the engine that has the little nozzle for the boost bottle, and just and bought another nozzle and 2 ft of tubing, got a can of NOS and an old gatorade bottle (Gatorade bottles are a lot thicker and harder plastic than normal soda bottles and they can hold compressed air) and decided to put them together with some loctite and electric tape.

This is the final product, the carb pipe comes in tommorow so I will keep you guys updated with photos and text! Tell me if I shouldnt be doing this.
I think it looks pretty cool to be honest!
it's to big. won't work right. It has to be tuned to your engine. You need to do some math to get the right size chamber and the tubing plays a big role too. Small tubing is a higher freq than fat tubing. Different lengths etc, do different things to the tuning. They are used mainly( in my experience, and built right into the intake design) to gain in the low end where it stumbles on the transition. You can tune them to different rpms though. Think of your engine as a musical wind instrument. That's what it is. It is called tuning.
 

CrispyLeaves98

Active Member
Local time
7:11 AM
Joined
Jul 29, 2021
Messages
459
Location
Calhoun County, Michigan
it's to big. won't work right. It has to be tuned to your engine. You need to do some math to get the right size chamber and the tubing plays a big role too. Small tubing is a higher freq than fat tubing. Different lengths etc, do different things to the tuning. They are used mainly( in my experience, and built right into the intake design) to gain in the low end where it stumbles on the transition. You can tune them to different rpms though. Think of your engine as a musical wind instrument. That's what it is. It is called tuning.
Too confusing. I really do appreciate the help but this is just a fun stupid thingy Im doing
 
Top