Wifes Kart

[itsid]

yeah.. that seams perfectly reasonable
cutting, rolling and welding another 50+ tiny little sheets of metal,
to save an inch of room...

Why do I think of Earthworm Jim now?

'sid

 

[exenos]

What does this rev to? Must be pretty low if the pipe is that long.

 

[Desertduler]

What does this rev to? Must be pretty low if the pipe is that long.

With the current port timing the peak HP output will be around 6250 rpm and the pipe BMEP is around 8 for a wide power band.

 

[Desertduler]

The pipe work is winding down.Here are some shots of the process.
This is some of the mid section segments of the pipe which will turn 90 degrees a kind of like a bent lobsters tail.

 

[directdrive]

This is intriguing. Nice work.

 

[Desertduler]

This is intriguing. Nice work.

Hey thanks,Stay tuned and we will see how she runs with this engine and pipe combo.I will be changing engines and state of tuning often.I have many engines to put on my kart you never know what I am going try out next.
I don't even know.

 

[Desertduler]

Moving right along with the pipe.

 

[Desertduler]

Almost done.

 

[Desertduler]

The stinger will come out of the cone and go to the aluminum silencer below the pipe inside the frame and the exhaust will exit out of the left side.

 

[Desertduler]

So I decided to go the old school way without a silencer for now because of my concern of burning my engine down at high RPM. I think the added length with the silencer may be too long.I will make a U bend stinger and hook up the silencer later and check out the exhaust temp with a pyrometer.For now I will use ear plugs and on another note my fellow racers will know where I am at.

I am going to weld a tab to my frame and pipe and install a rubber isolator between the pipe and the frame mounted tab.
I have slotted the tab because when I adjust the chain the pipe must move along with the engine.

 

[itsid]

looks great, can't wait to hear it

'sid

 

[rmm727]

What gauge sheet metal for the pipe? I need to try that software out and cnc plasma out some pieces and give it a shot.

 

[Desertduler]

What gauge sheet metal for the pipe? I need to try that software out and cnc plasma out some pieces and give it a shot.

.0375,cnc plasma? Thats cheating man! if you do make one I can help you figure out the cone program so you can make all of the sections that one needs to make in order to make turns and such because I had to figure out those by myself and how to do it.
The cone program does not give you all the info you need to do so.
You will see what I mean.
I tried to heli arc the pipe but the metal would oxidize and it left a crappy weld so I welded it with my wire feed with .023 wire and 75% argon 25% carbon dioxide gas.

 

[Desertduler]

Yeah Sid,
I can't wait to see how it sounds and runs.
I will set the jetting up and then post some videos.
I love the sound of an un capped expansion chamber.
Just like the good ole days.

 

[rmm727]

I could try it in Inventor and then flat pattern it. But I havent learned enough about rolling metal with that program. That must be about 18 gauge you are working with. I have 16 gauge that cuts pretty good with fine cut consumables. I could use your pipe design. I think I have the same motor. Havent done the work you did to yours but it would be nice to try.

 

[Desertduler]

I could try it in Inventor and then flat pattern it. But I havent learned enough about rolling metal with that program. That must be about 18 gauge you are working with. I have 16 gauge that cuts pretty good with fine cut consumables. I could use your pipe design. I think I have the same motor. Havent done the work you did to yours but it would be nice to try.

If you have the same engine as mine and the porting is stock port timing I could mail you the design you need for that engine if you are wanting a wide powerband like me.
I have ported this engine but I did not alter the port timing.
I would also share a little trick that I do on this engine that makes it pull alot harder down low.

 

[Desertduler]

https://www.youtube.com/watch?v=5pkVhyTbJzw
Here is some footage of my kart while I was testing the results of the tuned pipe performance.
Now onward with more building.

 

[mysteryboy28]

sounds quick and peppy!

 

[Desertduler]

sounds quick and peppy!

Yes it runs pretty good kind of like driving on ice in the dirt.
The kind of power a piston ported two stroke makes is like a light switch on or off.
It takes throttle control in the corners and when the engine comes up on the pipe that is when the fun begins.

 

[Desertduler]

This black thing is a HUGE performance gain!