Wifes Kart

[Desertduler]

http://www.buildandclick.com/html/tuned_pipe.html
Take a look at the program and you will get a better understanding about it.
Bret

 

[itsid]

I do not believe this engine would ever make that kind of power there is no way,That hp figure is what I had to enter in order to get the pipe configuration in the midrange and this engine would sign off at about 5000 rpm, I would estimate maybe another 5 to 7 hp with the pipe but I have recut the combustion chamber and set up the squish band and done some port work and blending of the ports and I have bored out the intake manifold to accept a Mikuni VM30 carburetor so I have done many things that will total up and what that would be in actual hp figures would be a guesstimate without putting the engine on a dyno
but who cares? That's what I dig is making modifications to engines and making them better even if it is a old JLO utility engine.But I can tell you that my kart is not the lightest and I myself weigh 245 and that old engine pulled me around excellent for what it is!

Ah, so the 25 was just some sort of "correction value" for the program to do what you want, I see

15-17 HP sounds plausible, but still: it'll be a fast kart in the end

Oh one more question:
that program;
can it only make straight pipes, or can you add bends for it to recalculate the templates too?
I mean 1.5 meters is a little long for a kart
and it'd be easier to fit with one or two bends, doesn't it?

[EDIT]

http://www.buildandclick.com/html/tuned_pipe.html
Take a look at the program and you will get a better understanding about it.
Bret

ah thank you..
almost missed that

'sid

 

[Desertduler]

Ah, so the 25 was just some sort of "correction value" for the program to do what you want, I see

15-17 HP sounds plausible, but still: it'll be a fast kart in the end

Oh one more question:
that program;
can it only make straight pipes, or can you add bends for it to recalculate the templates too?
I mean 1.5 meters is a little long for a kart
and it'd be easier to fit with one or two bends, doesn't it?

[EDIT]

ah thank you..
almost missed that

'sid

You can make them pretty much any shape you need.
There is a cone shape program that goes along with the program and you add the angles that you want for the different sections of the pipe to get the desired shape you need and you can print out the templates on a printer from your computer and cut them out and roll them and tape them together and see if it is going to fit and make corrections as needed.

 

[Desertduler]

I will post pictures of the pipe build and then one will be able to see how it is done.
I have a slip roller that I will be using in order to roll the metal cones and sections of the pipe.

 

[Desertduler]

I will post pictures of the pipe build and then one will be able to see how it is done.
I have a slip roller that I will be using in order to roll the metal cones and sections of the pipe.

Here is a animation of how an expansion chamber works.
http://en.wikipedia.org/wiki/Expansion_chamber

 

[machinist@large]

A curiosity question; somewhere in the youtube world I saw a video of someone hydroforming an expansion chamber for a two stroke (brand and size unspecified IIRC) using two pieces of sheet metal cut to a shape, then edge welded together, with a pipe fitting on one end to fit a quick couple connector for a residential power washer....

It blew the assembly up like a slow motion balloon, but the edges that were welded were still straight. Would that be a problem? And would the software be able to support a design like that?

Like I said, this is a curiosity question; if I ever need to try and fab a two stroke exhaust, I do already own basic small metal forming equipment, so the hydroforming thing would just be an experiment....

Pat

 

[Ted Hamilton]

Kart-specific pipes are a little different than mx-style pipes -- they have internal cones and stingers.... Will post a pic if I can find one. Same calcs may apply.

 

[Ted Hamilton]

 

[Desertduler]

A curiosity question; somewhere in the youtube world I saw a video of someone hydroforming an expansion chamber for a two stroke (brand and size unspecified IIRC) using two pieces of sheet metal cut to a shape, then edge welded together, with a pipe fitting on one end to fit a quick couple connector for a residential power washer....

It blew the assembly up like a slow motion balloon, but the edges that were welded were still straight. Would that be a problem? And would the software be able to support a design like that?

Like I said, this is a curiosity question; if I ever need to try and fab a two stroke exhaust, I do already own basic small metal forming equipment, so the hydroforming thing would just be an experiment....

Pat

I think it would be easier to cut out the sheet metal for the average person with the templates that you print out and roll the cones and pipe with a slip roller or have someone roll them for you.
It would take some sort of mold I would think with the configuration of the pipe that was needed but I am sure it could be done.

 

[Desertduler]

Kart-specific pipes are a little different than mx-style pipes -- they have internal cones and stingers.... Will post a pic if I can find one. Same calcs may apply.

With this program you can enter what the pipe is going to be used on,Kart,Motorcycle,etc,single gear ratio or gear box or CVT,etc.
I will use a silencer for a motorcycle with the correct size stinger that the pipe needs and the program gives you those figures.
Take a look at the first screenshot on the link that I posted earlier and you will get an idea what you can make pipes for.
http://www.buildandclick.com/assets/images/Image1_resize.jpg

 

[Desertduler]

I will be making a tuned expansion chamber for this baby too.

 

[Desertduler]

Starting to build a tuned pipe for one of my Rotax engines.
Paper mock up first and then I will make one out of sheet metal.
Here one can see the first part of the header pattern and I will keep on posting as I move along if anyone is interested if not I will stop.

 

[machinist@large]

Why do all of you Central and West Coast time zone people always put up the good stuff after I've gone to bed?

 

[mckutzy]

That is cool, I like it. How are you going to weld it.

 

[Desertduler]

That is cool, I like it. How are you going to weld it.

Thanks,
TIG or Wire feed with .025 wire and argon gas.
I am working on the cones and mid sections right now and I will post more pictures soon.

 

[Desertduler]

I am still working on the pipe mock up.
I had to shift more of the pipe forward in order to get the pipe to fit better.
I bet I can cut out some excellent paper dolls now!

 

[Kelly Wood]

For those of you watching, this work he's doing is very good and the attention to detail is spectacular.

Really one of the cleaner setups he's got going.

 

[Desertduler]

Heading in the right direction now.

 

[machinist@large]

That is a heck of a lot of work. And in the photo's, it's all holding itself together with scotch tape?

Pat

 

[Desertduler]

That is a heck of a lot of work. And in the photo's, it's all holding itself together with scotch tape?

Pat

Not too bad really,It will be easier from this point on.
Scotch tape and hot glue is what is holding the pipe together.
Sometimes it takes a little work to make power.
I like a challenge and I am having fun doing this.
It will be worth it.