boost pressure gauge for a boost bottle?

is there any way to get a boost presure gauge for a boost bottle??? and about how much psi do you think a boost bottle puts out???

why the hell would you want to know the psi on your boost bottle cause theres no compress air in the bottle! do you even know how the boost bottle works? its not presurized...and btw boost gauge will run you any where from $60-$200, but good luck on that one...

hey do yall know any way to tell if your cateye is 49cc or a 43cc with out taking my engine apart. (heres an example i made up. 43cc have spark on side and 49cc have them on top) becasue iam gonna make a boost bottle and i need to know if my bikes a 49cc or a 43cc engine to calculate the boost bottle size.

Maleeh

all the engine look about the same, whether its 43 or 49. Obviously you can tell if you pull the piston and match one up and guess or you can do a volume test(look it up). Besides...its not gonna make a big difference on the size of the bottle as long as its not over kill...

i thought that it sent vapors into the tube and once it got enuf vapors(which i thought would cause preasure) it would force it into the engine.....i want to know so i can time it perfectly when the boost bottles kick in to take off(possibly giving me more low end) i think i might of found one on e b a y for the "low preasure boost" (it only reads up to 2psi and i think the boost bottle kicks in .5-1 psi but i have no real idea) would this work(by the way it only costs like 25 dollars)

Save your money and spend it on another mod. It pushes it in and pulls it out with each half stroke so a gauge will not be needed.

id say just get a juicebox...- cost less and easier to install because the volume is already 49cc and it does the exact same thing...

I suppose you could just tap in a car vacuum gauge because you should see vacuum when the pressure in the intake is lower and the charge stored in the boost bottle is leaving.

boost bottles get all the "extra" gas that dosnt go into the engine because of acclerationg and then all of a sudden stoping and the gas fills up the boost bottle and then all the gas is sent into the engine when enough pressure is built. i will make a 2.99 inch boost bottle for my 43cc-49cc cateye. good size??

Maleeh

ehh not exactly rox.... just look here n itll explain all u need to know.... http://www.2-stroke-porting.com/bbottle.htm

omp boost bottles are over rated,overhyped and underperforming and many times will mess with the tuning,drain into the motor when you tilt your bike in the turns,its better to do engine mods to make hp,if your wanting to put a bottle on stock engine to magicly transform it into a race motor you will be disapointed (backwash bottles are devices engine tuners can use somtimes to help a race motor tune a little better) its not a crutch to make a motor fly. porting and pipe matching is a better way to make power.

I've got a juice box, and I have to say I could feel the difference after the install. Definitely a change in low & mid range. Its a good mod for people with limited budgets.

[quote=Mblough]I've got a juice box, and I have to say I could feel the difference after the install. Definitely a change in low & mid range. Its a good mod for people with limited budgets.[/QUOTE Im not saying they dont work,but did you read the thread,boost gauges ,pressure etc,timing the charge makes me think of cars and nos. so newbies think its like a nos setup and boost bottles are a magical hp maker,I have had a line of people thru my door diappointed that their bottle or box didnt make their bike scream never mind there tuning problems and took off ther setup and tune around it.they can help a bit in accelration ,but at the races the juice box can drian in the turns and load up the bike out of the turn and it will bog, I AM NOT SAYING THEY DONT WORK just dont rely on it to make it scream . thanx TRACY

[/QUOTE Im not saying they dont work,but did you read the thread,boost gauges ,pressure etc,timing the charge makes me think of cars and nos. so newbies think its like a nos setup and boost bottles are a magical hp maker,I have had a line of people thru my door diappointed that their bottle or box didnt make their bike scream never mind there tuning problems and took off ther setup and tune around it.they can help a bit in accelration ,but at the races the juice box can drian in the turns and load up the bike out of the turn and it will bog, I AM NOT SAYING THEY DONT WORK just dont rely on it to make it scream . thanx TRACY[/quote]
I swear I need to print this out and post it in my store. I have to agree...the **** product is overrated. Personally I think the money you spend on a dual boostbottle, you could do a PBU reed kit and prolly works better.

I swear I need to print this out and post it in my store. I have to agree...the **** product is overrated. Personally I think the money you spend on a dual boostbottle, you could do a PBU reed kit and prolly works better.[/quote]thank you finally someone agrees with me,yea 200 doller boost tubes geez!!

ok so bout how much psi does it make or does it make any???

no pressure it a storage bottle for the backwash kicked out buy piston port engine in this case and then sucked back in by the piston in pulses ,piston going up and down by the intake opening same way it gets into the bottle, pressure wave from the piston desending into the cases some fuel air charge escapes into intake tact/carb so the bottles stores it until the suction caused by piston asendig sucks it back into the engine so no psi in bottle ! take off your airfilter and pinch off your bottles line start engine rev engine observe the fuel air charge being exspelled out of carb top (fine mist spraying out of carb) thats what piston port means piston is the valve thats closing off the intake hole to make primary compression in the cases.blah blah any way thats it for 2stroke 101 rite now its not super detailed so yall dont jump on me,just keeping it simple sorry about my spelling ,now Im going back out in the shop,got broken pb to repair. hope that helps some tracy

that seems fairly logical! i may have to think about it more but i would think that it does pressurize in order to force it back down when the reed opens up, there fore thats pretty smart thinking of a boost gauge! have fun my friend...

Unfortunately that common explanation is also wrong.

Boost bottles must be one of the most misunderstood (and usually incorrectly built) add-ons in this hobby.

A boost bottle does not pressurize nor does it store air/fuel for any period of time.

A correctly engineered and installed boost bottle simply provides a resonant space in the intake tract that attenuates the pressure pulse that would usually travel back out the carb causing a double rich condition.

To be effective, a boost bottle is engineered with very accurate specifications specific to the engine it is installed on. A proper boost bottle is tuned to an engine just like the expansion chamber on a tuned pipe.

The pressure pulse being sent from the cylinder back through the intake partially travels into the boost bottle and is reflected in a manner that helps cancel the pulses and keeps them from traveling back through the carb.

A boost bottle specifically handles pressure pulses (sound waves), not the air/fuel mixture.

With all the tutorials on making DIY boost bottles, almost every one of them has one glaring mistake. The inside diameter of the tube that connects the bottle to the intake manifold is almost always way too small to allow the boost bottle to be effective. The smallest inside diameter of the tube or any fitting should be no less that 1/2-1/3 the diameter of the carb venturi. So any boost bottle using tiny 1/8" ID or 3/16" ID barbed fittings is a complete waste and any noticeable performance enhancement with such crap is just wishful thinking. Most of the common fittings I see being recomended are 1/4" threaded barbed fittings. They too are much too small.

Also the volume of the tube must be calculated and included with the internal volume of the boost bottle for the appropriate size.

Well frogger what size of fitting do you recomend for the boost bottle?