Not to change the subject from airplane engines, but for poops and giggles I took off the muffler and ran it for a day.
4 things : 1st , it was loud, 2nd, the hesitation between 18-1900 was back, 3rd, a lot more top end, 4th, it was really loud.
Keep in mind the homemade 'y' pipe ends under the driver seat outside of the frame rail and under the cab - so, pretty short.
I would love to have the money and time to make an exhaust system with mandrel bent pipes to see what I could gain and maybe try a a 2 1/2" in and out muffler, but that is what bench racing is for I guess. Thought I would pass it along, and I'm standing by that large exhaust is for top end only - driveability is compromised - FWIW.
Still want to put on a turbo and MS1 or MS2 with mutliport - no funds, but lots of fun thinking about it. Maybe someday.
