Re: silly question about muffler versus straight s

Posted by K.B.-826 on February 21, 2007 at 21:52:15 from (68.115.110.247):

In Reply to: silly question about muffler versus straight stack posted by NE1 on February 21, 2007 at 21:07:25:

All backpressure does for a diesel engine is rob power. A diesel engine textbook I have states that for an average heavy-duty diesel engine, a 2 psi increase in backpressure will cause a loss of 4 horsepower. As far as noise goes, a naturally asperated diesel with a straightpipe under load is just too loud for a person to tolerate for more than a few minutes without some sort of ear protection. The noise level of most smaller turbocharged diesels when straightpiped is pretty reasonable. The spinning turbine cancels out the harsh sound impulses. IH had a straightpipe on the 1206 from the factory, and the muffler was replaced with a straightpipe on the thousands of tractors that had M&W turbo kits installed. Larger turbocharged diesels have quite a bit of "bark" when straightpiped, which is why the guys who have to run them in the field 10 hours a day prefer to have a muffler, but they are still noticably quieter than a natually asperated straightpiped engine.

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