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Making my dad's lgt 125 quieter?


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#16 dualresponse1731 ONLINE  

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Posted February 28, 2021 - 07:58 AM

Trying to get the k301 exhaust pipe off. Looks relatively clean, but it's probably rusted solid inside. Using a set of chain vice grips and mallet, but still no enough force. Also heating engine up and pouring water on the pipe only to cool it down while the engine block is still hot, but no luck yet. thoughts?

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#17 poncho62 ONLINE  

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Posted February 28, 2021 - 08:59 AM

Can you just turn the 45 degree fitting to line up with the muffler?


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#18 dualresponse1731 ONLINE  

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Posted February 28, 2021 - 12:42 PM

Can you just turn the 45 degree fitting to line up with the muffler?

I was hoping the same thing, but the straight extension was too long for the muffler to still fit upfront.

 

Success nonetheless!!!!!

 

I went to HF and bought 2 more chain clamps. All three together gave me plenty to smack against with a mallet.

The rest of the muffler went on without too much incident.  I will probably remove, sandblast, and refinish, working on the fitting where the pipes insert into the muffler, but overall... so much quieter! Thanks all. R

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#19 gears OFFLINE  

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Posted March 06, 2021 - 06:57 PM

Nice work, what's the decible difference?

#20 dualresponse1731 ONLINE  

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Posted March 07, 2021 - 06:26 PM

Nice work, what's the decible difference?

 

Well... Thanks for asking. I was just getting ready to post. 

 

I kind of screwed up my scientific test. The decibel meter got stuck in the mail, and just got here. I got too tired to wait for it, so I went ahead and removed the old peppercan muffler before measuring it, so there is no before and after number. 

 

But, the new muffler is quieter, especially at idle. With the new decibel meter finally arriving, the lgt125 was measuring about 85 decibels at idle and 107 at full blast. Another dual peppercan exhaust (on another v-twin tractor)  I have was running 112 decibels mid throttle, and a newer 2009 John Deere 728 ran about 90-100 decibels (which I thought would be quieter).

 

My wife talking - about 81 decibels.

The engine bay of my car - 80 decibels.

Background ambient noise- 45 decibels.

 

 

In conclusion, the newer muffler is quieter, but perhaps not quiet enough, and, my wife is louder than my car.

I found a chart on decibel levels, I don't know if it will enlarge big enough to read, but here it is anyway.

https://soundproofin...mparison-chart/

 

Another thing I noticed is that the increase in decibels is not linear. I just looked it up, and it seems true. For example, an increase in 10 decibel points doesn't mean it's 10 points louder, it means it is 10 times louder.

R

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Edited by dualresponse1731, March 07, 2021 - 06:47 PM.

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#21 4getgto ONLINE  

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Posted March 07, 2021 - 07:38 PM

Well... Thanks for asking. I was just getting ready to post.

I kind of screwed up my scientific test. The decibel meter got stuck in the mail, and just got here. I got too tired to wait for it, so I went ahead and removed the old peppercan muffler before measuring it, so there is no before and after number.

But, the new muffler is quieter, especially at idle. With the new decibel meter finally arriving, the lgt125 was measuring about 85 decibels at idle and 107 at full blast. Another dual peppercan exhaust (on another v-twin tractor) I have was running 112 decibels mid throttle, and a newer 2009 John Deere 728 ran about 90-100 decibels (which I thought would be quieter).

My wife talking - about 81 decibels.
The engine bay of my car - 80 decibels.
Background ambient noise- 45 decibels.


In conclusion, the newer muffler is quieter, but perhaps not quiet enough, and, my wife is louder than my car.
I found a chart on decibel levels, I don't know if it will enlarge big enough to read, but here it is anyway.
https://soundproofin...mparison-chart/

Another thing I noticed is that the increase in decibels is not linear. I just looked it up, and it seems true. For example, an increase in 10 decibel points doesn't mean it's 10 points louder, it means it is 10 times louder.
R

So according to your chart your wife is (almost) harmful to your ears.? 😉

Edited by 4getgto, March 08, 2021 - 07:32 AM.

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#22 dualresponse1731 ONLINE  

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Posted March 08, 2021 - 05:34 PM

So according to your chart your wife is (almost) harmful to your ears.?

 

I will neither confirm or deny such statement. I am only reporting objective data :)

 

So... I am thinking the tractor is still not quiet enough. My strategy now is to buy sound deadening mat. I am going to install it on my closed sided lgt on the sides, etc, to see how quiet I can make that.

 

I am on a quest for quiet. Infact, I was even wondering about covering the mower deck in matting.

 

The  search continues.

 

Ron


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#23 gears OFFLINE  

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Posted March 08, 2021 - 08:41 PM

What about putting the pepper can at the outlet of the canister muffler

#24 Rock farmer ONLINE  

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Posted March 10, 2021 - 05:23 PM

When the Nixon administration founded the EPA,

one of the first things they did was to set noise limits on outdoor power equipment.

 The result was the closed side LGT.

That’s the best Jacobsen engineers could come up with.

I really don’t think you can do better.

 

Joe


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#25 secondtry OFFLINE  

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Posted March 10, 2021 - 05:56 PM

When the Nixon administration founded the EPA,

one of the first things they did was to set noise limits on outdoor power equipment.

 The result was the closed side LGT.

That’s the best Jacobsen engineers could come up with.

I really don’t think you can do better.

 

Joe

Most likely not the best they could come up with. More likely the cheapest fix that would satisfy the regulations.

Don


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#26 dualresponse1731 ONLINE  

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Posted March 10, 2021 - 06:09 PM

When the Nixon administration founded the EPA,

one of the first things they did was to set noise limits on outdoor power equipment.

 The result was the closed side LGT.

That’s the best Jacobsen engineers could come up with.

I really don’t think you can do better.

 

Joe

..and poor kohlers have been frying ever since! 

 

I can't remember, but it does seem like some of the closed sided tractors my dad has (had?) had insulation on the inside of the panels. This is what I aim to replace. I am also going to "gasp" replace the pulley cover (i.e- grass / corrosion collectors) on the mower deck.

 

My only problem with my closed sided is that my eaton hydrostatic screams like a banshee. I've already replaced the  pump, filter, and fluids. It's always been a "loud" one compared to the other lgt's I've known and loved.

 

At any rate, the sound deadening is in the mail. At current usps rate, it should be here by 2022!


Edited by dualresponse1731, March 10, 2021 - 06:09 PM.

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#27 dualresponse1731 ONLINE  

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Posted April 03, 2021 - 03:07 PM

Okay, so I give up on the 125 as a quiet tractor. Too much engine noise. Once I got the muffler routed, all I could hear were valves and rod knock. It goes back to the country.

 

So, onwards to the 145 with the 23hp repower.

Today was a lot of fabricating. Running dual rear exhaust that have to:

1.Clear the front wheels when turned, also clearing when the front axle is tilted.

2.Clear the mower deck

3.Clear the rear wheels

4.Clear the rear 3-point 

5.Not be a in place to cause  stuff to burn. Hands/paint/reflectors/feet/etc.

 

One benefit  of this is going to be the snowblower. In the past, the forward facing exhaust heats the blower unit, melting snow in the 2 stage chute. Fine when you are using it, but a real pain when it refreezes solid! This new setup will  cut down way down on exhaust heat. It is already significantly quieter than the twin peppercan setup. Tomorrow I work on mounts for the pipes/rear mufflers, cutting out the front fascia so it will fit flush on the tractor,  and finalizing the design.

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Edited by dualresponse1731, April 03, 2021 - 03:11 PM.


#28 dualresponse1731 ONLINE  

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Posted April 04, 2021 - 02:15 PM

Day two of the dual rear exhaust project.

Pretty much 80% done.

 

Looks very subtle, and clears the 3 point rocker arm. Much quieter. Changed the oil, hydrostatic fluid, and a leaky hydraulic ram, then mowed the lawn. Nothing burst into flames. Success, but I'm done for the day. Time for a beer.

 

 

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#29 KennyP ONLINE  

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Posted April 05, 2021 - 04:44 AM

Good job on that!


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#30 4getgto ONLINE  

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Posted April 05, 2021 - 06:08 AM

It does look good..
Your neighbors "might" have to find something else to complain about now..
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