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Discussion Forum

Muffler vs straight pipe

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Mike S

06-19-2001 20:33:39




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Anybody dyno test a muffler vs straight pipe if there was a HP gain? I pull antique class with 10%
over RPM.




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burns

06-22-2001 09:47:06




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 Re: Muffler vs straight pipe in reply to Mike S, 06-19-2001 20:33:39  
I am not sure what brand you are running. There are vendors that make reproduction Deere mufflers that can make the outside look like an OEM muffler but doesn't contain the interior baffles. Kind of get the best of both worlds. K&K is one that I am aware of. I personally have not had this done but its an idea anyway.



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Matt Sheaffer

06-22-2001 09:32:27




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 Re: Muffler vs straight pipe in reply to Mike S, 06-19-2001 20:33:39  
I run strait pipes on all of my tractor and I have no complaints



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G Taylor

06-22-2001 12:21:49




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 Re: Re: Muffler vs straight pipe in reply to Matt Sheaffer, 06-22-2001 09:32:27  
Wear your ear plugs anytime on equipment. How many farmers/equipment operators respond with "huh or what"? Our local stock pull isn't stock with a straight pipe. The 450 engine in the same officials Super M seems to be OK however.



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Rich

06-21-2001 20:05:16




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 Re: Muffler vs straight pipe in reply to Mike S, 06-19-2001 20:33:39  
Mike Throw the muffler away,Even if you did loose power from the straight, pipe its still worth that good sound!!! Loud pipes save lives!! Have a good one Rich B



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G Taylor

06-21-2001 11:07:06




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 Re: Muffler vs straight pipe in reply to Mike S, 06-19-2001 20:33:39  
Depends on the muffler. Some are very restrictive & others show no difference on the dyno. Running a muffler slows down the deafning process. Also looks more "stock". Gives the competition & officials less to complain about.



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Rob Mo.

06-23-2001 19:15:44




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 Re: Re: Muffler vs straight pipe in reply to G Taylor , 06-21-2001 11:07:06  
Straight pipes may sound good & give it that performance sound to it. However, what about the engine itself? The valves are allowing more heat to past by with a straight pipe. With a muffler, the heat is being slowed down by chambers. If you can get a muffler for a car & make it sound mean, get one for the tractor.



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G Taylor

06-24-2001 08:38:10




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 Re: Re: Re: Muffler vs straight pipe in reply to Rob Mo., 06-23-2001 19:15:44  
If the air/fuel mixture is kept the same, lowering the exhaust back pressure lowers exhaust temperatures due to the universal gas law. Where increasing exhaust temps appear from lower restriction is due to a leaner/hotter mixture. More air is being pumped through the lower restriction engine but the carb has not been re-jetted to compensate back to origional cooler ratio. Detonation can appear with the leaner mix & cause an engine failure.

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