Posted by s.crum on February 10, 2011 at 17:52:20 from (12.75.110.72):
In Reply to: exhaust pipe diameter posted by Justin SE IOWA on February 10, 2011 at 17:16:21:
You can go to 3" OD exhausts to get a lower tone rumble. But don't be surprised to see your low end and mid range torque disappear. Larger exhausts especially on a normally aspirated gas engine cost dearly in flow velocity and thus volumetric efficency of the engine. This is especially true with higher lift and longer duration camshafts. Exhaust scavenging in a normally aspirated engine is a big consideration.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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