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Tractor Talk Discussion Board |
Re: silly question about muffler versus straight s
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Posted by Ken Macfarlane on February 22, 2007 at 12:55:28 from (156.34.142.102):
In Reply to: Re: silly question about muffler versus straight s posted by Don-Wi on February 22, 2007 at 00:04:00:
On a non turbo diesel the backpressure plays almost no role in
power and it only affects the very top end of your dyno chart.
BTW it would be a heck of an exhaust to cause 2 psi
backpressure. On a turbo'ed diesel the backpressure plays a bigger role as it
can reduce the peak intake pressure which really can affect hp. The reason exhaust backpressure has such little effect on
naturally aspirated engines is there is such an excess of
pressure in the cylinder when the exhaust valve opens, say 100
psi vs the 14.7 psi atmosphere, if the backpressure causes 16.7
psi, it is still gonna scavenge the cylinder quite well.
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