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Discussion Starter · #1 · (Edited)
I decided to make two videos today of the Cub Cadet muffler and the standard pepper pot muffler on a K301 engine.

First the pepper pot muffler

http://rich.homeunix.com:443/gravely/muffler/DSCN0201.MOV

The CC muffler.

http://rich.homeunix.com:443/gravely/muffler/DSCN0200.MOV

The CC muffler would be even quieter with it pointing forward. I can't do a quick change with a proper street ell on it.

Here is a hot swap. The videos are a bit on the large side.

http://rich.homeunix.com:443/gravely/muffler/DSCN0197.MOV
 

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Discussion Starter · #2 ·

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Gravely Model L Guy
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hey some of my videos are in the related videos!
 

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that second one is a lot quiter - your point I expect?
 

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Discussion Starter · #5 ·
that second one is a lot quiter - your point I expect?
Ron wanted to know how much quieter. Since a picture is worth a thousand words, video and audio must be worth a lot more.

It certainly eliminates that harsh pop-pop-pop.
 

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Gravelyyard.com
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Ron wanted to know how much quieter. Since a picture is worth a thousand words, video and audio must be worth a lot more.

It certainly eliminates that harsh pop-pop-pop.
Yes, it is. Good enough to convence me to buy one see how it does on the 5665.

Have you run it enough to see if there is any effect on performance or back firing on shutdown?
 

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Yes, it is. Good enough to convence me to buy one see how it does on the 5665.

Have you run it enough to see if there is any effect on performance or back firing on shutdown?
Since Richard-TX is my father I figured I would comment.
My 5665 was the first to receive the conversion to the cub cadet muffler.
It is much quieter and power delivery seems the same, no backfiring issues.
It also seems smoother but that could be a placebo effect.

For the price it sure makes our single cylinder kohlers sound a whole lot nicer.
I could actually talk not YELL to my dad while it was idling.

-Rich
 

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Gravelyyard.com
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Since Richard-TX is my father I figured I would comment.
My 5665 was the first to receive the conversion to the cub cadet muffler.
It is much quieter and power delivery seems the same, no backfiring issues.
It also seems smoother but that could be a placebo effect.

For the price it sure makes our single cylinder kohlers sound a whole lot nicer.
I could actually talk not YELL to my dad while it was idling.

-Rich
Sold! I just ordered one.
 

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Don't think these are just for the Kohlers, I've posted pictures before but dad has had one for years on his C8. Works perfectly fine on them too and actually lays down nicely along the handle bars where the brace at the exit end can easily be clamped on. I find what it does is makes it quiet enough that you can hear all the other noises of a Gravely T head. It is by no means a quiet machine, but not near as much pop as the pepper pots.

Here is a link to a picture (I'd post it in but it's huge and would be a bit excessive. Maybe I can re-size it later today and post into the thread...)

http://i2.photobucket.com/albums/y49/NCSU4x4/Gravely/DSC00529.jpg
 

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Discussion Starter · #10 · (Edited)
Don't forget the street ell and the 1-1/4" muffler clamp Ron.
 

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Discussion Starter · #12 ·
I am not sure what it is called, but that pop on deceleration is gone with the CC muffler. I suppose that is called backfire. The logical explanation is that the longer muffler allows the hot fuel vapors to cool below the ignition point before it meets the air. The small muffler just allows too much air to come in contact with hot fuel vapors.
 

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I am not sure what it is called, but that pop on deceleration is gone with the CC muffler. I suppose that is called backfire. The logical explanation is that the longer muffler allows the hot fuel vapors to cool below the ignition point before it meets the air. The small muffler just allows too much air to come in contact with hot fuel vapors.
I call it a backfire, but it's not a true backfire, just a pop in the exhaust on shut down. It might be an engine issue. I have a B&S muffler on my 62 LI T head and it will pop on shut down. I've had others tell me theirs doe it too. My 8199KT Series I does it as well and I know the bottom of the muffler has a hole in it. It dosen't hurt anything, but I jump everytime.
 

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- probably not enough rom to put these on a 301 on a 4-wheeler?
 

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Price?
Part Number?
A good place to order one?
I bought one off of eBay for $31 shipped. Item 220714338174

Muffler replaces Kohler 237550.

Also replaces Cub Cadet 393840-R91


There seem to be two types for sale, a silver one (might be galvanized) and a black painted one. The black ones seem to be cheaper. They range from $22 plus shipping to $60 plus shipping.
 

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Gravelyyard.com
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- probably not enough rom to put these on a 301 on a 4-wheeler?
I have an 8122 and I plan to check out how much space it would take. I'll take some pictures. The domed can muffler on the K301 riders is what I call a B&S muffler. I bet it would fit, but it might interfere with a lift hitch. It might be too long to be very protected.
 

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Discussion Starter · #17 · (Edited)
I have had those shutdown explosions on every twin cylinder engine I own with the exception of the Pro-16 and 24G.

I think what happens when a shutdown explosion occurs is that unburnt fuel is dumped out the exhaust when the engine is shut off. When the ignition is shut off the engine continues to spin sucking fuel into the cylinders and out the exhaust. When air creeps in via the tailpipe is when the hot unburnt fuel ignites.

The reason that the Pro-16 is immune to this issue is likely due to the fuel solenoid on the side of the carb. As soon as the ignition is turned off, fuel is shut off inside the carb. The solenoid is a necessity on that tractor. Without it, a brief shutoff of the engine due to the operator briefly removing his hands for the OP switches would dump fuel into the exhaust. Once the operator placed his hand back on the switch, the engine fires and the flame front would ignite the fuel in the muffler, blowing the muffler apart.

For those engines that can have a fuel shutoff solenoid installed, simply adding one will resolve the issue. On carbs where a solenoid cannot be installed, the only solution is to let it idle for a minute or two permitting the hot muffler(s) to cool before turning it off. Another option would be to add a length of tailpipe. The extra length of pipe will slow the ingress of air creeping into the hot muffler.

The Kohler M18 I have is particularly prone to exhaust explosions. I am surprised the mufflers haven't blown apart by now. I am not sure why that engine is so prone to it.

The 24G seems to be immune to exhaust explosions. I believe it has to do with the length of the exhaust system. The exhaust on the 24G is fairly long and by the time the unburnt fuel reaches the muffler, it has cooled enough so that it can't ignite.

I have shut off my 24GLX after a hard run and heard two distinct pops. They were small almost humorous pops. First one popped, then the other. Since that happened, I have added tail pipes. That addition may eliminate the pops.

Fuel solenoids were an option on certain Kohler and Briggs carbs.
 

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Thanks Richard,

That engineering insight about the fuel shut-off valve makes perfect sense with the new safety present switches.

The 'unburned fuel pop' during coast down, will get your attention with some mufflers. I think the muffler itself is still hot enough to ignite a fuel air mix.

But how does the engine still not suck gas out of the carburetor during the coast down with the new system? Maybe, if no fuel can come into the carb, none can be sucked out of the fuel bowl.

Roger,
 

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Discussion Starter · #19 ·
The way the fuel solenoid works is that when it not energized the main jet is completely closed off.
 
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