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Kohler Ch620 Exhaust Manifold Build


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#1 frenchy OFFLINE  

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Posted February 04, 2013 - 01:12 PM

Hey all

 

so as some of you have already seen, I'm retrofitting this Kohler CH620 onto my Dynamark/MF14 chassis. Part of my job is to make an exhaust manifold. Yes, I'm aware that Kohler sells them, but they are $180 CAD and not very "pimp" so to speak.

 

I'm fortunate to have a friend with a CNC Plasma cutter, so I designed the flanges in eMachineShop and he cut them out to spec out of 1/4" plate. So i have these flanges, some Weld Els and some 1" black pipe that will be the materials for my exhaust manifold/headers. For those unfamiliar with the CH620, it's an 18hp horizontal shaft v-twin.

 

Does anyone have any good design ideas for such a thing? I'm thinking individual headers and i'll run them diagonally down so the ends are somewhat under the running boards.  Does that seem like a viable option? Will I lose out on HP running split headers like that? I plan to have the ends threaded so I can have twin Kohler can mufflers on the ends to silence the noise.

 

Thoughts?

 

Here's a pic of the engine on the chassis.

 

tractor.jpg


Edited by frenchy, February 04, 2013 - 01:13 PM.

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#2 Texas Deere and Horse OFFLINE  

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Posted February 04, 2013 - 02:03 PM

The only thing I can think of is you may need a cross over pipe to keep the back pressure equal between them.



#3 JDBrian OFFLINE  

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Posted February 04, 2013 - 04:28 PM

Sounds like it should work. If you can keep the pipes symmetrical and equal length the pressure should balance. Will having the mufflers down low like that be an issue with ground clearance or with heat radiation onto whatever is below it. You may need to shield them from the floor boards as well. 



#4 frenchy OFFLINE  

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Posted February 05, 2013 - 01:35 PM

Tell me this doesn't look badass :) ImageUploadedByTapatalk1360089282.971142.jpg ImageUploadedByTapatalk1360089303.615656.jpg I'll likely throw a can muffler on the end of each one to quiet her down a bit.
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#5 KennyP OFFLINE  

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Posted February 06, 2013 - 08:02 AM

That exhaust is going to warm the toes come summer. I would have went a bit lower with it. Otherwise, looks good!



#6 frenchy OFFLINE  

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Posted February 06, 2013 - 08:07 AM

Yeah I'm probably going to put elbows at the ends and go down a couple inches.

#7 larryd OFFLINE  

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Posted February 08, 2013 - 07:10 AM

Looks pretty mean. Just curious about heat.

 

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