Would like to do dual exhaust conversion

[KMA]

Like many of the PT owners here, I have a lot of heat build up and would I'd like to convert my 422 to dual exhaust. I thought the simplest way to do this would be to locate a Robin engine exhaust port adapter to change it to NPT threading. From there, I could use standard piping and other parts to route the exhaust out of the engine compartment. I also thought it might be easier to then select a set of threaded mufflers.

Does anyone know where to locate an adapter like this? If not, is there somewhere that sells exhaust pipe that would fit this engine? (not sure of the diameter, etc...) I've been searching all over with not much luck.

Thanks for the help!

 

[SnowRidge]

Try Jacks Small Engines. They sell on the web, and they have that sort of thing for Kohler. They might have them for Robin.

 

[MuncyBob]

Kevin...I was also considering doing this, but being the gentleman that I am I'll wait for you to do it first with pics of course!

 

[Rivco]

Like many of the PT owners here, I have a lot of heat build up and would I'd like to convert my 422 to dual exhaust. I thought the simplest way to do this would be to locate a Robin engine exhaust port adapter to change it to NPT threading. From there, I could use standard piping and other parts to route the exhaust out of the engine compartment. I also thought it might be easier to then select a set of threaded mufflers.

Does anyone know where to locate an adapter like this? If not, is there somewhere that sells exhaust pipe that would fit this engine? (not sure of the diameter, etc...) I've been searching all over with not much luck.

Thanks for the help!

KMA, You could do what I did on my 180. The 422/22HP & 180/18HP engines are the same size and specifications with the exception of the carb & governor settings. Feel free to download the pictures ( these pictures are of my well tested prototype set up )to give yourself a few ideas.. I'll leave the pictures uploaded until tomorrow.
Then they go back into my vault...only to resurface by special request

 

[Barryh]

KMA, You could do what I did on my 180. The 422/22HP & 180/18HP are the same size with the exception of the carb & governor settings. Feel free to download the pictures ,to give you some ideas.. I'll leave the pictures uploaded until tomorrow.
Then they go back into my vault.

This is on my list also... Wish someone would make and sell a kit .... Hint Hint

 

[Rivco]

This is on my list also... Wish someone would make and sell a kit .... Hint Hint

Not to go against TBN's rules and regulations,.... but what would you guys be willing to pay for a well tested dual exhaust bolt on kit???, or Carry all bed, maybe a mini hoe with 12" or 16" buckets,or how about 42" adjustable pallet forks,or maybe even a Hydraulic boom lift etc. etc. Send me a PM if interested.

 

[KMA]

KMA, You could do what I did on my 180. The 422/22HP & 180/18HP engines are the same size and specifications with the exception of the carb & governor settings. Feel free to download the pictures ( these pictures are of my well tested prototype set up )to give yourself a few ideas.. I'll leave the pictures uploaded until tomorrow.
Then they go back into my vault...only to resurface by special request

Rivco,

The pics look great! If you don't mind me asking, what did you use to mate the piping to the engine?

Thanks!

 

[Rivco]

Rivco,

The pics look great! If you don't mind me asking, what did you use to mate the piping to the engine?

Thanks!

The robin engines don't have a female threaded exhaust port like the Briggs & Straton and a few other engines so I had to duplicate the OEM exhaust flange. I fabricated them from 1/4" A36 steel plate ( mild steel ).

 

[KMA]

The robin engines don't have a female threaded exhaust port like the Briggs & Straton and a few other engines so I had to duplicate the OEM exhaust flange. I fabricated them from 1/4" A36 steel plate ( mild steel ).

Thanks again! Maybe instead of making a whole dual exhaust kit, you could whip up several pairs of the exhaust flange-to-NPT threaded adapters to sell to anyone interested in trying dual mufflers.

 

[Gravy]

My attempt at adapting the Robin factory complete side-mount exhaust kit http://www.tractorbynet.com/forums/power-trac/100127-robin-exhaust.html didn't improve the noise level or power as much as I hoped, but I think the factory exhaust manifold might work well with a better muffler. When I finish destroying the current muffler, I'll try something different.

My limited knowledge of exhaust system design suggests that a properly designed single exhaust gives a wider usable power band than a dual system. I suspect that duals with a crossover and large volume mufflers would be best. I hope somebody figures it all out so we can all steal the design!

Gravy