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Old 21st February 2006, 06:47   #1
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Certain questions I would like to get answered.
1. Does a stinger/ chamber increase perfromance of a bike?
2. Which is the most optimal design of a stinger/ chamber?
3. Can anybody explain how a stinger/ chamber work, and relevant performance feedbacks....
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Old 21st February 2006, 06:52   #2
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Quote:
Originally Posted by rankoz350
Certain questions I would like to get answered.
1. Does a stinger/ chamber increase perfromance of a bike?
2. Which is the most optimal design of a stinger/ chamber?
3. Can anybody explain how a stinger/ chamber work, and relevant performance feedbacks....
are u referring to a combustion chamber?
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Old 21st February 2006, 20:49   #3
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Quote:
Originally Posted by buzzin_hornets
are u referring to a combustion chamber?
I think he's talking about an expansion chamber.

On 2 strokes, a chamber is supposed to pull out the spent charge as quickly as possible and without pulling out any fresh charge with it. In fact, a good chamber will have a pulse going back towards the cylinder to prevent fresh charge from coming out along with the spent charge.
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Old 21st February 2006, 20:52   #4
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A chamber, if made correctly accodring to the bike will increase the performance of 2stroke bikes.

Off Topic - Are chambers used on 4strokes too? Or are they mufflers??
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Old 21st February 2006, 20:56   #5
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Mufflers are only used to deaden sound... don't think its used for much else.

For 4 strokes, I don't think they're called expansion chambers. But the exhaust system in a 4 stroke is designed for a slightly different purpose.

On 2 strokes, the pulse is used to push charge back in. On 4 strokes, the exhaust system should be designed in such a way that no pulse goes back to the cylinder. Also, if not designed properly, on a 4 stroke, you could fry your exhaust valve...

Tech whizzes, please correct me if i'm wrong.
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Old 22nd February 2006, 07:16   #6
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Wow! That was an eye opener!! I have put a chamber made manually by my mechanic, for my 4-stroke honda dio, and the performance decreased like anything - specifically :
1) mileage reduced significantly.
2) Pickup reduced.
If further explainations as to why the above two inefficiencies took place, I'd be greatly obliged ( if required, i can post the pic of the internal part of the chamber ....)

..... Thankz a lot guys!!
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Old 22nd February 2006, 15:28   #7
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what exactly did he consider when designing the "chamber" ?
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Old 23rd February 2006, 07:48   #8
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the chamber he has given looks plain simple, with no emphasis on the actual logic behind it ( as given in earlier posts)..... i'm not good at the technical side so bear with me....
It comprises (from outside to inside) of a cylinder (the exterior shell of the chamber), glasswool, mesh, and finally a thin pipe like thing.... i think u call that the muffler....

I would appreciate some logic on the said above configuration....thankz
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Old 23rd February 2006, 15:11   #9
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This sounds more like a simple free flow design sort of exhaust... I have my doubts if he considered factors like back pressure when designing it...
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Old 23rd February 2006, 18:58   #10
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no i dont think he did ......how do i make it right?!....rather what do u suggest in makin a performin stinger...
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Old 23rd February 2006, 19:57   #11
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sorry bud... got very little knowledge when it comes to automatic scooters... Why do you want to mod a dio?
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Old 26th February 2006, 16:41   #12
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someone pls tip me...........
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Old 27th February 2006, 13:38   #13
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Think Satya's right here...
Your mechanic has only done something to the exhaust system...As expansion chambers (stingers as u call them) can only be applicable to 2-strokes. As for a free-flowing exhaust, I think that if not done properly it adversely affects the exhaust valves...am i right? And it does affect the average also...just makes the bike sound better.
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Old 28th February 2006, 21:54   #14
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yeah.... there was a drop in performance.... like the pick up reduced quite a bit, but it did great between 50-70 km/hr...... the exhaust valve is ported......
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Old 1st March 2006, 06:08   #15
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Quote:
Originally Posted by rankoz350
yeah.... there was a drop in performance.... like the pick up reduced quite a bit, but it did great between 50-70 km/hr...... the exhaust valve is ported......


Now don't tell me the dio has got reeds also.



U don't put chambers/stingers to four stroke engines. Ur mech must be 2-T specialist.....

Use a free flow exhaust sys.And get the tuned length right. And add performace air filter something like UNI or K&N.
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