Exhaust Pipe Sizes
Many Mercury Owners/Enthusiasts are interested in making their engines breathe better, and inquire about exhaust systems geared to maximum power and/or overall performance.
Here is a table that shows the best pipe diameters for your engine: 1st Column = Pipe Diameter (inches) 2nd Column = Pipe Area (square ins.) 3rd Column = Total CFM (estimated) 4th Column = Max HP Per Pipe 5th Column = Max HP For A Dual Pipe System 1 1/2" -----1.48 171 78 155 1 5/8" -----1.77 203 92 185 1 3/4" -----2.07 239 108 217 2" --------- 2.76 318 144 289 2 1/4"----- 3.55 408 185 371 2 1/2"------4.43 509 232 463 2 3/4"------5.41 622 283 566 3"---------- 6.49 747 339 679 3 1/4"------7.67 882 401 802 3 1/2"------8.95 1029 468 935 Estimated figures based on Outside Diameter, 16-gauge pipe thickness. Too small of a pipe robs top-end power. Too large of a pipe decreases low and mid-range torque. |
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