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To get back to the original subject. I owned thrush mufflers in 2 1/2" on my 74 AMC Matador and changed to 3" Flows! The flows were better in everyway!!! IMO
Quote from: bobcooter on June 20, 2010, 03:45:05 PMMaybe I'm a little slow, but I can't for the life of me see how anything with any type of baffles or anything in the flow stream can out flow a glass pack that is straight through. No way. It's just like putting your thumb over the end of a garden hose. When does more water flow from the hose? With your thumb over the hole or the hole left wide open? Just my 2 cents. Well I encourage you to do some research then. When you put your thumb over the end of the garden hose what happens to the jet stream of water? Does it increase it's velocity? Does it increase it's pressure? How does this effect your desired goal? If you run your tap water and stick your finger underneath the flow of water what happens? If you put the corner of the rounded part of your finger into the sream of water what happens? Why do people port and polish heads? Why do we make intake and exhaust sytems with bends in them? Why are some runners longer than others? Why do we run different size tubes? Why have a dual plane intake instead of a single plane? Why have variable intake geometry? With research and study you will see that the effects of different mufflers and headers and diameters etc you can gain HP. It's not snake oil when flow technology and dyno results show that the end result is a positive gain.
Maybe I'm a little slow, but I can't for the life of me see how anything with any type of baffles or anything in the flow stream can out flow a glass pack that is straight through. No way. It's just like putting your thumb over the end of a garden hose. When does more water flow from the hose? With your thumb over the hole or the hole left wide open? Just my 2 cents.
I have done some research. Maybe that's why I'm a little confused. I understand that porting and polishing heads makes them flow better. I understand bends and different lengths of runners. To keep them equal length. I understand why we have dual plane and single plane intakes. I don't know anything about variable intake geometry. I also understand that exhaust gases travel through your exhaust pipes as pulses when each cylinder is fired. I also understand that if you run too big an exhaust pipe you will slow down those pulses and and make less power. I guess I just get a little lost on the downstream side of the engine. If you have everything flowing along nicely with the correct sized exhaust pipe and you put a restriction, then you lose some of what you worked so hard to gain. If you use the water pipe example, yes, the water downstream of your thumb does indeed speed up because it is taking a pressure drop across an orifice basically. But the water upstream of your thumb slows down and builds pressure.This would be in the engine. I wasn't trying to make anyone mad. Sorry if I did.