Quarkdude's bike with Boost Bottle installed ( PICS )

Here is the Diamond Bike mountain bike with the Boost Bottle installed. There has been some interest on how this thing gets mounted. Here is my representation of how to mount the boost bottle to a mountain bike with an 80cc Chinese engine. This thing sure makes the engine run a lot smoother plus helps the engine rev faster. Boost bottles on this setup do work - you can definitely feel it.
.............quarkdude

 

nice lookin setup
does the bottle need to be pressurized?
that is some serious fuel line (no lack of flow there !)
keep an eye on your carb for small carp (no fuel filter)

 

Hello azkronic, some info on boost bottle function

The intake pulse that is felt between the cyclinder and the carb when -off the throttle or when the piston is down covering the intake port causes air to try to go back out thru the carburetor - it has no place to go but back out. The boost bottle gives that intake pulse atomized fuel a place to go and be stored ( a little bit of pressure also ) in the momentary condition. Then when the throttle is open, the regular carburetor to intake air fuel mixture + what is stored in the boost bottle is sucked into the engine and you get some what of a supercharger effect. The atomized fuel going into the boost bottle is in a gas ( non liquid form ) so it is easily "digested" by the engine when it comes back out of the boost bottle.
The boost botttle is somewhat pressurized by the intake pulse pressure - but this is all automatic when the engine is running. A person doesn't pressurize the bootle like filling a tire with air.
I have the kit form of a fuel filter inside the gas tank on the inner gas tank part of the fuel petcock valve. I don't have an external fuel filter - maybe it is better to have one, just haven't tried it.
..............Thanks, quarkdude

 

i just asked about a boost bottle and its the same one u have its like 12 bucks what site did ures from

 

thanks for the very informative answer dude !
made the whole thing understandable !

 

Boost Bottle website I got mine from

I got the boost bottle from www.boostbottleindustries.com
It was about $20.00 shipped. I would be interested in your install - keep us posted.
........quarkdude

 

Haven't heard of these before, sounds like its pretty worth the small price though. Did you have to drill and install the intake for it yourself or can you use one of the pre-drilled intakes they sale on their site?

 

HI,
Glad to see / hear that it actually works...I have one but have not installed it yet...I did read somewhere that the bottle should be set so as to drain any possible accumulated gasoline (in case the gas vapor mix condenses back to a liquid in the bottle) back into the carb....I suppose a long term test wold be in order?....I'll try to find where I read about that aspect of bottle mounting...
Andrew

 

does anyone think there is more off a benifit of using two boost bottles cause im ordering one withing the week

 

Modifying your intake for a boost bottle Chinese 80cc

Do you have a Chinese 49,55,70 or 80cc 2 stroke engine? I looked at the intakes they sell on the site and they are for a different carb and head setup then what are on a Chinese engine. The intakes they sell are for Pocket bike motors. The stock or aftermarket Chromed steel intake for the Chinese engine can be drilled and tapped to accept the 1/8" NPT fitting that is treaded into the intake. The aftermarket chromed steel intake that I have doesn't have a lot of meat to tap into - so you have to be slow and easy when you tap it. But it is enough to get the NPT fitting in and sealed. I also used Loctite thread locker on the fitting to make sure it doesn't back out under vibration.

 

One boost bottle or Two - Hmmmmm

I did some research on this very topic of using one or two boost bottles. One would assume that 2 boost bottles would be better. The answer is Yes and No. The theory behind the magic of the boost bottle is that the volume of the bottle should be matched OR ever so slightly larger than the volume of the cylinder that it is taking the intake pulse from and storing it. For a Chinese 80cc engine for example, the closest we can get is a 70cc boost bottle from www.boostbottleindustries.com or other suppliers. For the YES part of the answer to using 2 boost bottles you can as long as the 2 boost bottles combined volume equals 70 or 80cc if you are using an 80cc engine. The NO part of the answer is basically if you use 2 boost bottles that have a combined volume larger than the cylinder volume - say an 80cc cylinder with 2 boost bottles combined that equal 150cc. I'm not sure of the effect of over expanding the intake with a boost bottle(s), but everything I have read says to match the cylinder volume with the boost bottle volume.
Some motorcycle manufacturers have used injection molded plastic square boxes attached to the intake as boost bottles. Heck you could even make your own out of a plastic bottled water bottle I would think ( Haven't tried this - experimentation would be at hand ). The boost bottle I used was already engineered and off the shelf ready to buy, so I just bought it in stead of trying to make my own. Hopefully this helps you on using two boost bottles and feeling confindent that it will work. Most people that see boost bottles on your bike think you have Nitrous Oxide - so having 2 boost bottles really ought to start some conversation. Ha ha

 

Get an NPT 1/4" tap, and put two end caps on 1-1/2" pvc pipe.

 

Homemade Boost Bottle by skyl4rk

Great idea - could probably build your idea for $5.00 to $8.00
End caps
PVC pipe
1/4" NPT fittings
glue

.........Not bad, I like it....thanks skyl4rk

 

0k ill be getting one thanks QUARKDUDE

 

Only thing about making a DIY boost bottle is to choose a material that is NOT affected by gasoline....Some plastics get eaten up by gas...
Andrew

 

I have an 80cc chinese engine as well. So you just used the 70cc kit they sell then? I'm pretty interested in getting one of these installed. Don't have anything to really tap in the nozzle myself. Maybe theres another MBc user in Tucson who could help me out.

 

70cc Boost Bottle for 80cc Chinese engine

The 70cc bottle from www.boostbottleindustries.com or Ebay search from the this site will be get you the boost bottle kit you need for the modification. The one I used is a 70cc boost bottle - I couldn't find an 80cc unit. I have read that the 80cc is somewhere around 69.8cc's and they call it an 80cc, so the 70cc boost bottle works great with this stock engine setup.
Have fun adapting the kit if you get one. It really is not to hard to install.
............quarkdude

 

Homemade Boost Bottle

You have a point there. Schedule 40 or Schedule 80 PVC should hold up to gasoline I would guess for a homemade boost unit.
.............quarkdude

 

I just bought a boost bottle. What can I say, you convinced me. I'm a little unclear about how you installed it though. Correct me if I'm wrong but it looks like you drilled the initial hole into the intake manifold. Did you use the 23/64" drill bit like the instructions suggested or did you use a more standard size? When you tapped the hole did you just use a standard 1/8" npt tap? And after the hole was drilled did you cut the fitting so it didn't block the flow of the intake manifold? How much did you cut it? Sorry I know this is a lot of questions but I would really appreciate some guidance on this.

 

edit, edit, edit: well, since there weren't any full pics, but only some great close-ups, it was an easy choice...moved to "wild..." obviously

good topic...i was told once that a boost bottle was one thing that would provide some added performance to the happy-time the "right way."