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Farmall & IHC Tractors Discussion Forum
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Gas Farmall Noise Levels?

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SAm in NS

12-11-2005 08:08:45




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I've just been trawling through the archives and saw a couple of posts about tractor noise levels that sort of set me thinking. I've heard some of these letter series gas Farmalls that run so quietly that you can barely tell they're running yet others seem to have a pretty snappy bark and I was wondering why? Thanks, SAm in NS




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Peabody

12-11-2005 18:17:22




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 Re: Gas Farmall Noise Levels? in reply to SAm in NS, 12-11-2005 08:08:45  
Sam, interesting commotion you caused with your thread here! By coincidence, today I replaced the old, beat-up original underslung muffler with a hole in it on my Cub with a brand new one. I noticed immediately that the old one with the hole was more quiet than the new replacement. Definitly the muffler design made the difference.



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CNKS

12-11-2005 17:29:58




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 Re: Gas Farmall Noise Levels? in reply to SAm in NS, 12-11-2005 08:08:45  
There are a couple of companies that make the mufflers for the letter series that have the original sound, or at least the sound I remember that they had when IH began using the longer pipe on the muffler. These were used beginning in the late 40's I believe. Those mufflers give a higher pitched more "staccato" sound than the usual IH replacement muffler, or other aftermarkets. The H I drove on my dad's farm was loud, my hearing is about 25% of what it used to be because of that and other machinery I have operated. An H will make more noise than a C -- the noise difference between tractors of the same model is mainly due to RPM and the type of muffler it has, and also the condition of the muffler. I doubt if going from 5.5 to 7.5 compression makes much difference.

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wolfman

12-11-2005 14:39:00




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 Re: Gas Farmall Noise Levels? in reply to SAm in NS, 12-11-2005 08:08:45  
Type of muffler definitely is a factor-straight thru vs baffled. Basically, gas Farmalls & Internationals are quite smooth, quiet and pleasant sounding. When I was a kid, I plowed days on end with a Super C & straight pipe. One fall Dad gave her a valve job & what a difference in the bark!



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PAULIH300

12-11-2005 09:53:24




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 Re: Gas Farmall Noise Levels? in reply to SAm in NS, 12-11-2005 08:08:45  
I would also think a tractor with a vertical muffler would seem louder than a Utility with an underslung exhaust,like a car.The bulk of the tractor is shielding the noise,whereas a vertical exhaust is staring you right in the face literally.



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CNKS

12-11-2005 17:59:46




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 Re: Gas Farmall Noise Levels? in reply to PAULIH300, 12-11-2005 09:53:24  
I've driven tractors with vertical and underslung mufflers. Fumes only bothered me when I was adjusting a rear mounted cultivator, or something, and the hydraulics leaked down, so I couldn't shut off the engine. The early IH mufflers had a short stack, and would direct fumes back to your face. I don't remember that being a particular problem until the short stack on one of our tractors eventually rotted out. Finally talked my dad into buying a new muffler, air was a lot cleaner with it.

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Hugh MacKay

12-11-2005 10:44:38




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 Re: Gas Farmall Noise Levels? in reply to PAULIH300, 12-11-2005 09:53:24  
Paul: Come on now, no man in his right mind ever operated a vertical exhaust tractor without top of stack being 6" higher than his head. That was always the down fall of the horizontal mufler noise and fumes coming up from under tractor.
The other guys got it right, compression ratio.

80% of those utilities were changed to vertical exhaust because operators couldn't stand noise or fumes, and of that 80% a third of those were changed because of risk of fires in hay fields. Today you never see a horizontal exhaust on a new tractor unless it was ordered special for orchard work. Make a guess why they disappeared.

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PAULIH300

12-11-2005 15:33:03




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 Re: Gas Farmall Noise Levels? in reply to Hugh MacKay, 12-11-2005 10:44:38  
With some of the loader setups back then(Pippin,Wagner),I'm surprised there was any room left for a vertical muffler.
Even with a stack thats 6" above the head of the operator,I'm sure in windy conditions,exhaust smoke (diesel) and fumes can still be blown back into the operators face.Unless you drive over an underground air pocket I cant see how underslung fumes can be brought more than 6' up to the operators nose(I can understand that with a cab it could trap fumes).
Minivans and SUVs use underslung exhausts,and those tailgates open up and stay open with long cargo inside.I dont read of too many occupants dying of carbon monoxide poisoning these days.
As for flammability....Yes,I can imagine that an underslung system would spark dry materials rather quickly,but they do sell spark arrestors.....dirt bikes have to use them,and tractors should too.

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Hugh MacKay

12-11-2005 16:51:15




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 Re: Gas Farmall Noise Levels? in reply to PAULIH300, 12-11-2005 15:33:03  
Paul: I've spent many hours in the seat of vertical exhaust tractors. As long as that stack is over height of ones head you will have no noticable fumes and the sound is above you. I have driven a few Ulilities and exhaust seems to get trapped between rear wheels at field operating speeds. It's fine out in road gear. Most of the monoxide deaths I've heard of happened in parked vehicles.

My tractors all had spark arrestors, yes even the utility we had on demonstration that started the hay fire had a spark arrestor. That fire was started by hay rubbing underside of tractor as well as exhaust. I know of numerous other fires started by horizontal exhaust systems in hayfields.

Now finally I ask you, why have horizontal exhausts all but disappeared on new farm tractors? Demand is the answer. The orchard guys want them and that is about it. I ask you, can all those farmers that spent thousands of hours in the operators seat of a tractor be wrong?

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john d

12-11-2005 14:36:46




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 Re: Gas Farmall Noise Levels? in reply to Hugh MacKay, 12-11-2005 10:44:38  
Concerning an IH 300U, there was a third reason for converting it to vertical exhaust: Even with the heat shield in place, it cooked my left foot!



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Hugh MacKay

12-11-2005 15:51:37




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 Re: Gas Farmall Noise Levels? in reply to john d, 12-11-2005 14:36:46  
John: As if straddle that transmission on a hot day wasen't enough, add a hot foot to it. I remember being at farm where they had 3 tractors equiped with berry harvesters. One was a Utility and the young operator was blessing that tractor. Hot foot plus you didn't dare wear shorts for fear of burning legs on transmission. They certainly weren't much on long hot days.

When I bought my 1066 it came without air. Young operator was complaining, when are they going to install the air. One day he surprised me, he had two thermometers one in cab the other tied to side of transmission case. One in cab was reading 125 degrees and on transmission 140. I don't know how that compares with older 30 to 50 hp tractors. I know you can get burns that will leave marks on your arm from 300 transmission and hydraulics on hot days. Best to be up in the air above all that.

Yes, I will agree if vertical exhaust is not above your head, they can be miserable both with sound and fumes.

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Randy-IA

12-11-2005 10:39:15




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 Re: Gas Farmall Noise Levels? in reply to PAULIH300, 12-11-2005 09:53:24  
It's also amazing how many weather caps I see that open towards the operators station . Those people really want to go deaf . Incredible how much noise those caps reflect . JMSO ...Randy



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SAm in NS

12-11-2005 11:41:47




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 Re: Gas Farmall Noise Levels? in reply to Randy-IA, 12-11-2005 10:39:15  
All of the tractors that I'm thinking of were vertical exhaust (and with Stanley mufflers to the best of my knowledge). There's a couple of H's, several Super A's, and a Super C. One of those H's I'm pretty sure was running on Distillate and that was incredibly quiet. Many thanks, SAm in NS



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RustyFarmall

12-11-2005 09:28:53




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 Re: Gas Farmall Noise Levels? in reply to SAm in NS, 12-11-2005 08:08:45  
It has to do with amount of compression the engine has. The older distillate and kerosene engines had relatively low compression and were pretty quiet. The higher compression gasoline engines would talk a little bit, and if someone has installed the aftermarket stepped head or domed pistons, this will raise the compression even further, and you can usually tell just by the sound which engines these are. They definately have a distinctive bark to the exhaust note and just sound like they are ready to "git-er-done".

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olderguy

12-11-2005 09:05:17




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 Re: Gas Farmall Noise Levels? in reply to SAm in NS, 12-11-2005 08:08:45  
Sam, Probably because of the quality of the muffler



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