Project Rocket Kart #4

[rushking19]

I'm back again finally I've been busy but I finally got the go kart running again, still needs a few thing like new spark plugs so it can run better I ordered new spark plugs already, but its running nun of the less need to scoot the motor a little bit more so everything can line up and then can put the clutch back on and I also need to order the adapter shaft and then the drivetrain will be complete, then I can technically drive it but the exhaust still needs to be made

 

[rushking19]

Video of it running with cvt https://youtu.be/3e2TWJc5Fvk

 

[ezcome-ezgo]

Great work so far. I'll be curious to see how that clutch works under load. The exhaust is going to be a challenge too.

 

[rushking19]

Great work so far. I'll be curious to see how that clutch works under load. The exhaust is going to be a challenge too.

Hopefully it works well under load so far its working pretty good and is in sync with the primary so we'll see how that goes once I connect the chain and the exhaust will be pretty hard but I'm planning something

I'm actually planning on using 2 of these pipes and then make a y pipe that will connect the 2 and ten ho under the axle and have a rlv muffler on the end

 

[J.S.@SMS]

If you want my advice, don't run the two exhaust pipes into a single tailpipe and muffler. My suggestion is to run a true dual exhaust and two rlv mufflers. Not only will a dual exhaust look cooler (in my opinion) but it will provide more airflow, which yields a slight bit more power. However this is your kart, so go with the design that you want to go with.

 

[anickode]

If you want my advice, don't run the two exhaust pipes into a single tailpipe and muffler. My suggestion is to run a true dual exhaust and two rlv mufflers. Not only will a dual exhaust look cooler (in my opinion) but it will provide more airflow, which yields a slight bit more power. However this is your kart, so go with the design that you want to go with.

A PROPERLY designed 2 into 1 would yield a slightly better gain than separate pipes.

And it's a two stroke, so it's even more important.

A tuned resonant pipe would be best.

 

[rushking19]

A PROPERLY designed 2 into 1 would yield a slightly better gain than separate pipes.

And it's a two stroke, so it's even more important.

A tuned resonant pipe would be best.

This engine never came with a expansion chamber when it came out it was before that so the pipe I plan on running shouldn't effect it and also the two pipes together would sound better than one in my opinion but nun of the less ot should sound interesting

This is the rlv muffler I plan on using to quite it down and how I want the exhaust tip to be, and the space I have to deal with the seat rail is actually getting removed so I can have more space to work with and also so the seat can sit lower, for a lower center of gravity

 

[S S]

now all it needs is an actual rocket on it.

 

[rushking19]

now all it needs is an actual rocket on it.

Yep I call it rocket kart because it will be fast like a rocket and plus the frame is shaped like a rocket

 

[Dingocat]

Nice kart/rocket lol, have one of these. I wouldn't want to go more than 45 on one

 

[rushking19]

Nice kart/rocket lol, have one of these. I wouldn't want to go more than 45 on one

It will go way faster than 45 lol i has a 24hp twin cylinder 2 stroke snowmobile engine on it and why not go faster than 45?

 

[anickode]

This engine never came with a expansion chamber when it came out it was before that so the pipe I plan on running shouldn't effect it and also the two pipes together would sound better than one in my opinion but nun of the less ot should sound interesting

This is the rlv muffler I plan on using to quite it down and how I want the exhaust tip to be, and the space I have to deal with the seat rail is actually getting removed so I can have more space to work with and also so the seat can sit lower, for a lower center of gravity

A 2 into 1 will also improve exhaust scavenging if it's designed right, and your muffler isn't too restrictive.

 

[rushking19]

A 2 into 1 will also improve exhaust scavenging if it's designed right, and your muffler isn't too restrictive.

That's what I was thinking and it shouldn't be restrictive rlv is a high flow muffler

 

[Kartorbust]

You'd get more efficiency with a proper tuner pipe.

 

[rushking19]

You'd get more efficiency with a proper tuner pipe.

I know that but originally this motor wasnt made with a tune pipe so this wont hurt anything and plus there is no space for a tune pipe

 

[anickode]

That's what I was thinking and it shouldn't be restrictive rlv is a high flow muffler

Just because it's "high flow" for a lawnmower engine doesn't mean it's "high flow" for anything else.

That's what, a 440?

Double the displacement, 2 stroke instead of 4, spins twice as fast... You are probably looking at anywhere from 4 to 8 times the total volume of exhaust produced by a 6.5 hp 4 stroke.

I could put a 3" flowmaster on my little pickup truck and it would be "high flow". Put that same muffler on a semi truck, and it would be a massive restriction.

Granted, a 2 stroke likes a LITTLE restriction, especially without a tuned expansion chamber, but you really need to make sure that it's not too much.

Horsepower is a good, albeit basic starting point to gauge by. Would you run that same muffler on a 2 into 1 header on a 670?

I'm not saying it won't work, just that it's a little more complicated than saying "high flow" on the box

 

[rushking19]

Just because it's "high flow" for a lawnmower engine doesn't mean it's "high flow" for anything else.

That's what, a 440?

Double the displacement, 2 stroke instead of 4, spins twice as fast... You are probably looking at anywhere from 4 to 8 times the total volume of exhaust produced by a 6.5 hp 4 stroke.

I could put a 3" flowmaster on my little pickup truck and it would be "high flow". Put that same muffler on a semi truck, and it would be a massive restriction.

Granted, a 2 stroke likes a LITTLE restriction, especially without a tuned expansion chamber, but you really need to make sure that it's not too much.

Horsepower is a good, albeit basic starting point to gauge by. Would you run that same muffler on a 2 into 1 header on a 670?

I'm not saying it won't work, just that it's a little more complicated than saying "high flow" on the box

It's a rotax 399 and it should be fine or else it's the first thing I'm changing it's a straight through muffler with baffles so it should be fine and pluses I'm enlarging the entry of the muffler anyway

 

[rushking19]

Slotting the holes on the motor plate so the engine can move over a little

 

[rushking19]

After hours of filing they are finally slotted and the chain and belt line up perfectly

 

[rushking19]

The new park plugs finally came