Ported 372 muffler mod (pipe size?)

[Ronie]

I just finished up porting a 372 cylinder and have a muffler I made up with a .80 ID piece of tubing. Is that a large enough opening or should I go larger?

 

[Ronie]

The exhaust port is 68% of the bore.

 

[Ronie]

Never mind, I just put a 1" pipe in it. Better to big than to small.

 

[Deleted member 149229]

This is on a stock 6421, runs great, 1”.

 

[Brent Nowell]

Yea 1” is the way to go. The original hole is around 5/8 so no point in going 3/4 imo.
I used 1” tubing, worked very well and made a large throttle response difference.

 

[Ronie]

Nice looking muffler. The one I made up doesn't look that good but will work.

 

[Brent Nowell]

View attachment 736822 This is on a stock 6421, runs great, 1”.

I have to say that your image shows your talent. Your brass line is almost unnoticeable and the fact that the tubing is stainless and shows no bluing from brazing is also very impressive.

 

[Deleted member 149229]

I have to say that your image shows your talent. Your brass line is almost unnoticeable and the fact that the tubing is stainless and shows no bluing from brazing is also very impressive.

Thanks but I can’t take credit for it. Mike Gott from Iowa did it, he’s done a couple for me, great guy.

 

[Ronaldo]

Thanks but I can’t take credit for it. Mike Gott from Iowa did it, he’s done a couple for me, great guy.

Mike does super neat work on those piped mufflers! And yes he's a great guy.

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[944storm]

I used two 1/2 inch ID pipes for mine. Breaths well!

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[Skeans]

No pipe here all mine were work saws but we ran dual 288 deflectors with arrestor screens for cutting timber.


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[U&A]

I don’t remember who did mine but the guy did a phenomenal job brazing

Sent while firmly grasping my redline lubed RAM [emoji231]

 

[Chainsaw Jim]

Lightening is the only thing I've ever seen start a fire faster than this muffler mod.

 

[Ronie]

Lightening is the only thing I've ever seen start a fire faster than this muffler mod.

I can see it happening. I have seen the bark smoking a little on long cuts with this mod but for me it's not a problem with size and type of wood I cut.

 

[Mike Gott]

Thanks but I can’t take credit for it. Mike Gott from Iowa did it, he’s done a couple for me, great guy.

Thanks for the compliment

 

[Mike Gott]

Lightening is the only thing I've ever seen start a fire faster than this muffler mod.

Interesting, I’ve never started a fire with any of mine

 

[Mike Gott]

This looks to be one of mine also

I don’t remember who did mine but the guy did a phenomenal job brazing

Sent while firmly grasping my redline lubed RAM [emoji231]

 

[Mike Gott]

Mike does super neat work on those piped mufflers! And yes he's a great guy.

Sent from my SM-S320VL using Tapatalk

Thanks Ron!

 

[Chainsaw Jim]

I can see it happening. I have seen the bark smoking a little on long cuts with this mod but for me it's not a problem with size and type of wood I cut.

It only takes a couple seconds for a good cherry to ignite on the wood around here, that's my own personal experience. One thing that helps is larger dogs to keep off the wood, but it's still a risk.
I'm not saying it's a bad mod. I mentioned it because that aspect can easily be overlooked and should be factored in when deciding on whether or not to do it.

 

[Mike Gott]

It only takes a couple seconds for a good cherry to ignite on the wood around here, that's my own personal experience. One thing that helps is larger dogs to keep off the wood, but it's still a risk.
I'm not saying it's a bad mod. I mentioned it because that aspect can easily be overlooked and should be factored in when deciding on whether or not to do it.

I can see that point, I done for some loggers to even. I’ve seen sparks come out of the screens too though. To be honest I’ve seen more sparks coming off a bar than a muffler. Yes my oilers work, chain was sharp and all too so don’t even start that scenario