bullet muffler flow numbers?
#21
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lol damn guys, talk about alot of info flowing in the thread.... the reason i love this site so! Thanks for all the feedback and help on this matter, i most definatly learned something reading all of it.
There was a point brought up stating that the flaring of the muffler would slow the exhaust due to turbulence. A theory they taught us in jet engine maintenance was Bernoulli's Principle, stating that a gas traveling at a velocity comes to a pressure difference within the path its traveling, it accelerates through that contracted point.
Same as an augmentor/afterburner on a fighter aircraft, for maximum thrust, the convergent/divergent nozzle closes, speeding up the exhaust gasses providing more thrust.
So after all that rambling perhaps the sudden contraction would speed up the gasses.... or i could just be talking out of my *** lol! Thanks again all!
There was a point brought up stating that the flaring of the muffler would slow the exhaust due to turbulence. A theory they taught us in jet engine maintenance was Bernoulli's Principle, stating that a gas traveling at a velocity comes to a pressure difference within the path its traveling, it accelerates through that contracted point.
Same as an augmentor/afterburner on a fighter aircraft, for maximum thrust, the convergent/divergent nozzle closes, speeding up the exhaust gasses providing more thrust.
So after all that rambling perhaps the sudden contraction would speed up the gasses.... or i could just be talking out of my *** lol! Thanks again all!
#22
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Originally Posted by JetMech99
lol damn guys, talk about alot of info flowing in the thread.... the reason i love this site so! Thanks for all the feedback and help on this matter, i most definatly learned something reading all of it.
There was a point brought up stating that the flaring of the muffler would slow the exhaust due to turbulence. A theory they taught us in jet engine maintenance was Bernoulli's Principle, stating that a gas traveling at a velocity comes to a pressure difference within the path its traveling, it accelerates through that contracted point.
Same as an augmentor/afterburner on a fighter aircraft, for maximum thrust, the convergent/divergent nozzle closes, speeding up the exhaust gasses providing more thrust.
So after all that rambling perhaps the sudden contraction would speed up the gasses.... or i could just be talking out of my *** lol! Thanks again all!
There was a point brought up stating that the flaring of the muffler would slow the exhaust due to turbulence. A theory they taught us in jet engine maintenance was Bernoulli's Principle, stating that a gas traveling at a velocity comes to a pressure difference within the path its traveling, it accelerates through that contracted point.
Same as an augmentor/afterburner on a fighter aircraft, for maximum thrust, the convergent/divergent nozzle closes, speeding up the exhaust gasses providing more thrust.
So after all that rambling perhaps the sudden contraction would speed up the gasses.... or i could just be talking out of my *** lol! Thanks again all!
#23
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one thing though from what I understand of exhaust flow...
It doesn't just flow through the exhaust system uniformly, it flows in pressure pulses. SO when one pulse passes the muffler, the interior gets pressurized like stated above, however when the pulse leaves it creates a low pressure zone behind it which draws out the pressure in the muffler itself in an attempt to even the two pressure areas. This leaves a lower pressure zone in the muffler. Then the next pulse comes up behind, and when it hits the muffler the pressure again tries to equal out the two zones, and thats why the exhaust gasses flow through the packing as well.
from what I understand
It doesn't just flow through the exhaust system uniformly, it flows in pressure pulses. SO when one pulse passes the muffler, the interior gets pressurized like stated above, however when the pulse leaves it creates a low pressure zone behind it which draws out the pressure in the muffler itself in an attempt to even the two pressure areas. This leaves a lower pressure zone in the muffler. Then the next pulse comes up behind, and when it hits the muffler the pressure again tries to equal out the two zones, and thats why the exhaust gasses flow through the packing as well.
from what I understand
#25
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If you took a dBA reading, I'd bet (my) Powersticks would be quieter - depending on the length used. The longer - the quieter (a little) = better sound to boot (more tuning). Bullets do VERY little to reduce noise - like 2-4 dBA's.
Pretty good, technical thread guys! Pretty accurate too.
Optimum exhaust flow depends mostly on correct flowpath/pipe diameter. Shrinking down the flowpath in a muffler may speed flow velocity, but it will also create backpressure which may be bad. It's very important to choose the right diameter. Too large = reduction in low end performance, too small = reduction in upper end performance. On these Firebirds/Camaros 3" seems to be the right diameter in the intermediate pipes with under 500 HP.
Funky exhaust systems on these cars for sure. When GM designed the exhaust (or floorboards!) on these cars, they did poor planning. You guys are doing the best you can though.
Pretty good, technical thread guys! Pretty accurate too.
Optimum exhaust flow depends mostly on correct flowpath/pipe diameter. Shrinking down the flowpath in a muffler may speed flow velocity, but it will also create backpressure which may be bad. It's very important to choose the right diameter. Too large = reduction in low end performance, too small = reduction in upper end performance. On these Firebirds/Camaros 3" seems to be the right diameter in the intermediate pipes with under 500 HP.
Funky exhaust systems on these cars for sure. When GM designed the exhaust (or floorboards!) on these cars, they did poor planning. You guys are doing the best you can though.
#26
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anybody try the single in dual out powerstick in place of the regular Fbody muffler? After checking it's too long. What about making a shorter 3 inch single in and dual out that could be put in place of the stock F body muffler and repiped as a 2 on the left or single pipes on both sides?
Last edited by wannafbody; 06-19-2006 at 05:54 PM.
#27
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Originally Posted by wannafbody
anybody try the single in dual out powerstick in place of the regular Fbody muffler? After checking it's too long. What about making a shorter 3 inch single in and dual out that could be put in place of the stock F body muffler and repiped as a 2 on the left or single pipes on both sides?