312-8 stack exhaust

[KW88 33]

What have you guys done to replace 312-8 with a stack exhaust/ pipe? Appears I gotta 1-3/8 OD off the 12hp kohler... 

[KW88 33]

4 minutes ago, KW88 said:

What have you guys done to replace 312-8 with a stack exhaust/ pipe? Appears I gotta 1-3/8 OD off the 12hp kohler... 

I'm not worried about noise, just want like a small stack like a foot or two up

[SylvanLakeWH 27,601]

@jimkemp sells them...

[ebinmaine 70,815]

 

 

8 hours ago, KW88 said:

1-3/8 OD

 

That's an NPT pipe thread size.

Likely 1-1/4".

 

I've done several Kohler single cylinder engine exhausts using a 45⁰ elbow attached to appropriate length double male pieces. One to the head and one to the muffler.  

 

For a muffler I've used a Cub or Gravely aftermarket replacement. 

Either works well and can be turned facing up. 

On top of the muffler you can get a metal bathroom drain pipe and trim as desired. 

This gives you the ability to have a turnout bend and point the end where you want it. 

 

 

[rjg854 11,895]

This is what he makes, they look like this.

[RED-Z06 2,479]

1" NPT into a 45⁰ elbow pointed straight out, into a 4" straight pipe, into a 90⁰ elbow up...into a "Kohler cub cadet" muffler.

 

https://youtube.com/shorts/V6y0zUDAdWI?si=y4DPgo1nZ-8go2uR

[ebinmaine 70,815]

5 hours ago, RED-Z06 said:

1" NPT into a 45⁰ elbow pointed straight out, into a 4" straight pipe, into a 90⁰ elbow up...into a "Kohler cub cadet" muffler.

 

https://youtube.com/shorts/V6y0zUDAdWI?si=y4DPgo1nZ-8go2uR

 

That's the way. 

 

You can use the above mentioned Gravely Muffler in the same set up. 

 

Also, where the 4" pipe is listed, I've used a longer section either from engine to elbow or elbow to muffler to add a little clearance for the hood paint. 

 

 

[tmorriss 3]

HI Folks.  I have a similar situation with my 1987 312-8 , with a Kohler Magnum 12 engine.  THe original muffler is falling apart and cant be repaired.

I now use this machine to mow areas where I don't want to take my new one, and I'd like to fix the muffler as cheaply as possible. What you have mentioned above

sounds promising as the current manifold is a 1 7/16 OD that accepts the factory clamp on. However, I really don't want the big muffler and long stack. Does anyone know(or done)

something similar by just removing the manifold pipe, screwing in an appropriate sized pipe with two male ends and then screwing on one of those small,round screw on mufflers?

OR will this type of muffler cause performance issues with the engine, loss of power etc?     Thanks in advance

 

 

[ebinmaine 70,815]

2 hours ago, tmorriss said:

HI Folks.  I have a similar situation with my 1987 312-8 , with a Kohler Magnum 12 engine.  THe original muffler is falling apart and cant be repaired.

I now use this machine to mow areas where I don't want to take my new one, and I'd like to fix the muffler as cheaply as possible. What you have mentioned above

sounds promising as the current manifold is a 1 7/16 OD that accepts the factory clamp on. However, I really don't want the big muffler and long stack. Does anyone know(or done)

something similar by just removing the manifold pipe, screwing in an appropriate sized pipe with two male ends and then screwing on one of those small,round screw on mufflers?

OR will this type of muffler cause performance issues with the engine, loss of power etc?     Thanks in advance

 

 

 

 

I have used the Gravely style muffler on several tractors now. 2   16 horse and one 12 horse.

Compact. 90° Bend built in. Rugged. Decent sound. No restriction.