Canister style expansion chamber

[Fabian]

Can't wait for the day.

Can you design a more compact low rpm torque pipe, like the older Curtis Youngblood (R/C) Muscle Pipe 5
It's a compressed long pipe layered into a multi-tubular arrangement, thereby greatly reducing it's external length yet retaining the total length of a tuned pipe:

 

[geebt48cc]

HS, looks the part!~ I read what your saying, I was just unaware that you could put a 90 degree bend in exhaust in order to get full results? Once again, it does look the part!!!!!!!

 

[Fabian]

Because in Australia we drive on the other side of the road, so it is advantageous to keep the pipe on the left hand side, so when traffic (i.e police vehicles) drive past, it makes it more discrete by hiding the bulk of the pipe on the left hand side of the bike; obscuring most of it from the eyes of a police officer.

 

[HeadSmess]

HS, looks the part!~ I read what your saying, I was just unaware that you could put a 90 degree bend in exhaust in order to get full results? Once again, it does look the part!!!!!!!

gas flow is not pressure waves! so yep, a pipe can look like a snail. or turn a ridiculously tight bend whilst still being effective.

too tight a bend and the gas breaks into turbulence. doesnt effect the pipes workings but does effect general flow in the system...


ahhh, curtis. old school heli master. the pipe itself though... hard to say.

physics be physics, and you cant alter how far the waves need to travel.

you cant "squash" a pipe into a shorter length concentrically.(unlike mirrors and lenses!)

but you could, i guess, somehow snake it around, the pipe has to stay within dimensional limits...

bends and joins equal time and money. tough luck. this clears everything nicely and should fit most frames and mounts entirely to the motor

the curtis pipe just looks like a standard expansion chamber, fed in at right angles. an expansion chamber, not a tuned pipe. big difference. an expansion chamber is exactly that, a chamber for expansion. its more of a silencer than anything.

helis require a fair bit of power but dont appreciate "pipey" behaviour, ie, powerbands etc. they want the motor to sit at various rpm's and stay there, predictably. they use 25% nitro for the power.

even an R/C car can become unuseable when the pipes too effective!

 

[HeadSmess]

Because in Australia we drive on the other side of the road, so it is advantageous to keep the pipe on the left hand side, so when traffic (i.e police vehicles) drive past, it makes it more discrete by hiding the bulk of the pipe on the left hand side of the bike; obscuring most of it from the eyes of a police officer.

oink oinks? boys in blue? so far ive been lucky but then again, is a point....


hmmmmmmmmmmmmmmmmmm.

joins equal time and money that people dont want to pay.

same time, as the pipes get lower in rpm, they get longer in length. 1.2 metres for 6000rpm!

easiest place is to continue bend around so it wraps right round frame and yes, does pop out on the left again...

 

[Fabian]

Jaguar, can you then design a compact expansion chamber like the stacked pipe arrangement as i have shown in a prior post, because many of us have concerns about the law and having a large and obviously visible motorcycle style expansion chamber on a bicycle, which makes it look much less like a bicycle and more like a motorcycle.

A compact expansion chamber that in some way resembles the standard exhaust pipe and muffler would make it less obvious to the long arm of the law.

 

[Deleted member 12676]

Why don't you just buy the pictured one? I have no idea of the internals and so I couldn't duplicate it.
If you don't want an expansion chamber then just extend the header of a standard exhaust 5 or 6 inches for more torque.

 

[Fabian]

Why don't you just buy the pictured one?

Because it is designed for a 15cc engine running at an operating speed of 15,000 rpm. It's length is only 15 centimeters.

A conventional tuned pipe for this style of engine is aprroximately 3 - 4 times the length of the Muscle pipe.
The innovative stacked design makes a tuned pipe significantly more compact.

With your knowledge of pipe design i am sure that you could make an equally compact design for the 69cc engine, making installation of the pipe not only more practical but less (visually) obvious to the law; a point to make note of for people living in an environment that crucifies those who use an internal combustion engine in their bike.

 

[Deleted member 12676]

It just isn't humanly possible to make an equivalent expansion chamber in that size.
Anyway the cops don't care what pipe you have on it as long as it isn't too loud. They care about engine size, max speed, lights, etc.
Please send me a text message if you want to persist on this wild idea of yours that can't work.
I guarantee you that bomb at best just has a diffuser cone in it, one that is too short. It is more of a muffler than anything.

 

[Fabian]

I guarantee you that bomb at best just has a diffuser cone in it, one that is too short. It is more of a muffler than anything.

I guarantee that you are wrong.
Curtis Youngblood is a world R/C helicopter pilot and has won many championships using his own designs and products. It might add weight to his results considering that he also happens to be an engineer, and non of his products are designed to offer less performance than any of the other market leading products.

I can't see why the (compact) stacked pipe principle is not able to be scaled up to the size of a standard 2-stroke exhaust/muffler system, not to mention it would be a much more user friendly to install and has the added benefit of avoiding the potential of contact burns between your leg and a conventional tuned pipe.

At very least it should be something that you can experiment with, given your knowledge on the subject.