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Tractor Talk Discussion Forum

Diesel exhaust

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Kentucky Ed

02-26-2007 15:53:18




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I posted this in Today"s Tractors with no replys. I have a new NH TT55 that is just plain loud. It has the factory under hood muffler, and a strsight pipe up. If I saw the pipe and install a muffler on the pipe will I hurt my engine, or will I reduce the noise? That is assuming I can find a muffler that has the same size outlet/inlet size. Will it void my warranty? Your advise is appreciated.




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buickanddeere

02-26-2007 18:13:12




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 Re: Diesel exhaust in reply to Kentucky Ed, 02-26-2007 15:53:18  
Choosing a muffler is tricky as some are designed to remove the low frequency sounds and others remove high frequency sounds. Odds are a large muffler from a high HP tractor will add little to no extra back pressure. The previous posts about a curved stack tip anmd ear plugs are important. A stack with the rain cap sloped towards you instead of away is several db louder.



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KEG

02-26-2007 17:45:27




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 Re: Diesel exhaust in reply to Kentucky Ed, 02-26-2007 15:53:18  
On my Ford F-250 7.3L Diesel (I know, not quite a tractor - but interesting none-the-less) I put on a new exhaust and it came with a muffler that was straight through - not like the old gas mufflers that created back-pressure, but a clear-through unit. The muffling came from the several holes cut into the center pipe going through the muffler that allow the "repercussions" of the exhaust to enter the holes and become "deadened". The sound waves bounce into the holes and cause reverse waves that counteract the sound.

Now, I"m not a sound engineer(as you can probably tell), but someone figured it out and it didn"t require a backpressure producing baffle to get a result.

Hope this helps - or gives you some ideas.

KEG

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Hurst

02-26-2007 16:19:40




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 Re: Diesel exhaust in reply to Kentucky Ed, 02-26-2007 15:53:18  
Just saw your name, where in Kentucky are you from? I am from Midway right outside of Lexington. Right now I am at boarding school in Chattanooga though...

Hurst



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Glenn F.

02-26-2007 17:26:46




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 Re: Diesel exhaust in reply to Hurst, 02-26-2007 16:19:40  
Hurst, I sent you an e-mail. Do you, by chance, attend Southern University?

Glenn F.



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Hurst

02-26-2007 18:02:50




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 Re: Diesel exhaust in reply to Glenn F., 02-26-2007 17:26:46  
No, I am in highschool still. I go to McCallie School. I got you're e-mail by the way. Thanks

Hurst



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Hurst

02-26-2007 16:18:00




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 Re: Diesel exhaust in reply to Kentucky Ed, 02-26-2007 15:53:18  
Just a couple of questions. What are you using the tractor for? Will clearance be and issue? Would a horizontal exhaust be a problem (like with baling hay and raking where it could cause a fire)? I would be very careful about putting on another muffler. That is just going to be more back pressure and sometimes it can do some weird things and raise EGTs (exhaust gas temperatures). If it were mine, I would first, if it hasn't already been done, turn the opening away from the operator. If that has already been done or is not enough, try a taller pipe pointed away (unless tree clearance is an issue). If it is like my TN65, the pipe just clamps on at the side of the hood. The other option would be to get a horizontal exhaust kit from the dealer (or it could be easily made at a local muffler shop if it's designed like our TN65). Again, be aware that if you are working in dry grass, this may be a fire hazard. A spark arrestor would be a very good idea here if there's not one already built into the muffler. Otherwise, I can't think of anything else other than use ear plugs. Those 3 bangers that NH uses are pretty noisy engines.

Hurst

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Leon R

02-26-2007 16:52:34




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 Re: Diesel exhaust in reply to Hurst, 02-26-2007 16:18:00  
You should be using hearing protectors regardless of the level of noise. It is the safe thing to do and the cheapest "fix" for a loud engine.



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