Quote:
Originally Posted by xlr8tr
more food for thought: if you have 4 header pipes at 1.75 inches internal diameter each, thats a total cross section area area of 9.6 square inches. A 2 1/2 inch ID muffler = 4.9 sq in, (no wonder there is a flow restriction) whereas a 3 inch ID muffler = 7.1 sq in, a 44% increase in cross section area, but still much less than the 4 header pipes. Although there is probably a bunch of fluid dynamics math thats way over my head to add to this...  |
Ahhh, . . but each pipe only fires and expells exhaust when that cylinder fires. It is not continual flow. Therefore the four pipes on the one side of the car share or contend for the flow volume of the muffler. They are not all flowing at the same time.
On the opposit end for induction, all eight cylinders do not draw air through the carb at the same time. They contend for it, each taking a turn.
There is a 47 page formula that explains this. I used to have it, but my dog ate it !!!
.